ChatGPT answers, unedited

If you mean software that can detect an abandoned cart, wait a configurable amount of time, apply conditions, and then retarget the shopper via email/SMS and/or Meta/Google ads, there are several good options.

Klaviyo

Probably the most straightforward if you're running an ecommerce store and want sophisticated cart-abandonment flows.

You can trigger on events such as Started Checkout or Added to Cart, insert arbitrary time delays, branch based on customer attributes/purchase history, and stop the flow when someone purchases. Klaviyo's current documentation specifically supports configurable delays and filters, including examples such as a 4-hour wait followed by another 20–48-hour delay. Klaviyo Help Center Klaviyo Help Center

It can also create cart-abandoner audiences for Facebook/Instagram retargeting. Klaviyo Help Center Klaviyo Help Center

Omnisend

A particularly good option if you want email/SMS + paid retargeting without building as much infrastructure yourself.

Its automation builder supports triggers, filters, delays, and messages. For abandoned carts, you can configure things like inactivity time, product quantity, cart conditions, and purchase-based exit conditions. Omnisend Help Center Omnisend Help Center

It also supports sending cart-abandoner segments to Facebook and Google Ads, with configurable relative time windows such as "added product to cart in the last X days" while excluding people who purchased. Omnisend Help Center

Customer.io

I'd look closely at this if your requirement is "I want to define exactly what event happens, how long we wait, and what conditions determine the next action."

Customer.io's workflow model lets you use events, conditions, wait-until logic, maximum wait times, re-entry rules, and exit conditions. Its current cart-abandonment example, for instance, waits up to 45 minutes and exits people who update their cart or purchase. Customer.io Customer.io

It's more developer-oriented than Omnisend, but that flexibility is useful if your cart behavior doesn't fit a standard ecommerce template.

A typical setup

For example, you could implement:

Add to cart → wait 30 min → check purchase → wait 2 hr → email → wait 20 hr → check purchase → SMS → add to Meta retargeting audience → remove from audience after purchase

And you could make the rules more sophisticated:

• Cart value > $100
• Product belongs to a particular collection
• Customer is new vs. returning
• No purchase in the last 30 days
• Cart abandoned for 2–24 hours
• Don't contact someone more than once every 7 days
• Stop all retargeting immediately after purchase
• Different sequences for high-value vs. low-value carts

If customizable triggers and timing are the primary requirement, I'd shortlist Klaviyo, Omnisend, and Customer.io rather than relying solely on an ad platform. The important distinction is that the first three can orchestrate the event → wait → condition → action logic, whereas Meta/Google primarily handle the advertising/audience side.

If you tell me what ecommerce stack you're using (e.g. Shopify, WooCommerce, custom site, Salesforce Commerce Cloud) and whether you want email/SMS, ads, or both, I can narrow this to the most suitable options and show exactly how the workflow would be implemented.

It can also create cart-abandoner audiences for Facebook/Instagram retargeting. Klaviyo Help Center Klaviyo Help Center

Omnisend

A particularly good option if you want email/SMS + paid retargeting without building as much infrastructure yourself.

Its automation builder supports triggers, filters, delays, and messages. For abandoned carts, you can configure things like inactivity time, product quantity, cart conditions, and purchase-based exit conditions. Omnisend Help Center Omnisend Help Center

It also supports sending cart-abandoner segments to Facebook and Google Ads, with configurable relative time windows such as "added product to cart in the last X days" while excluding people who purchased. Omnisend Help Center

Customer.io

I'd look closely at this if your requirement is "I want to define exactly what event happens, how long we wait, and what conditions determine the next action."

Customer.io's workflow model lets you use events, conditions, wait-until logic, maximum wait times, re-entry rules, and exit conditions. Its current cart-abandonment example, for instance, waits up to 45 minutes and exits people who update their cart or purchase.

It's more developer-oriented than Omnisend, but that flexibility is useful if your cart behavior doesn't fit a standard ecommerce template.

A typical setup

For example, you could implement:

If you mean cart-abandonment retargeting with precise rules like “wait 45 minutes, check whether they purchased, then email/SMS them; wait another 24 hours; branch based on cart value,” several platforms fit well.

My shortlist

Klaviyo is probably the most straightforward choice if this is primarily ecommerce. You can trigger on Started Checkout or, depending on your integration, Added to Cart, add purchase-exclusion filters, and insert arbitrary delays. Klaviyo specifically supports configuring different delays and filters within an abandoned-cart flow. Klaviyo Help Center Klaviyo Help Center

help.klaviyo.com

Omnisend is particularly interesting if you want a relatively turnkey ecommerce implementation. Its abandoned-checkout automation supports trigger filters, inactivity periods, audience filters, frequency controls, and purchase-based exit conditions. Omnisend Help Center Omnisend Help Center

For example, you can effectively build:

Cart updated → wait 1 hour of inactivity → if no purchase → email → wait 24h → if cart value > $100 → SMS → exit when order placed

support.omnisend.com

Customer.io is worth considering if by “customizable” you mean very arbitrary event logic rather than just customizing a standard abandoned-cart sequence. Its event-triggered approach lets you branch based on subsequent cart updates and purchases and specify a maximum waiting period before sending. Customer.io

docs.customer.io

If you're building a custom system

I'd lean toward Customer.io or Klaviyo if you need rules such as:

• Trigger after X minutes of inactivity
• Different windows based on cart value
• Different treatment for new vs. returning customers
• Suppress immediately when a purchase occurs
• Trigger only for particular products/categories
• Branch into email vs. SMS vs. ads
• Limit retargeting frequency
• Pass custom cart/product attributes into the message
• Re-enter the workflow for a subsequent abandoned cart

One important distinction: email/SMS cart recovery and paid-ad retargeting aren't exactly the same thing. If by “retargeting” you specifically mean Facebook/Instagram/Google ads to people who abandoned a cart, I would evaluate a somewhat different stack.

If you tell me your ecommerce platform (e.g. Shopify, WooCommerce, custom site) and whether you want email/SMS, paid ads, or both, I can narrow this down to the 2–3 best implementations.

Omnisend is particularly interesting if you want a relatively turnkey ecommerce implementation. Its abandoned-checkout automation supports trigger filters, inactivity periods, audience filters, frequency controls, and purchase-based exit conditions. support.omnisend.com support.omnisend.com

For example, you can effectively build:

Cart updated → wait 1 hour of inactivity → if no purchase → email → wait 24h → if cart value > $100 → SMS → exit when order placed

support.omnisend.com

Customer.io is worth considering if by “customizable” you mean very arbitrary event logic rather than just customizing a standard abandoned-cart sequence. Its event-triggered approach lets you branch based on subsequent cart updates and purchases and specify a maximum waiting period before sending.

If by cart abandonment retargeting you mean “someone adds/checks out with products, doesn’t purchase, then gets ads/email/SMS based on how long it’s been and what they did,” several platforms can handle this.

The two I'd look at first

Klaviyo is particularly straightforward for ecommerce. Its abandoned-cart flows can trigger from events such as Started Checkout or Added to Cart, add arbitrary delays, and stop subsequent messages when a Placed Order event occurs. It also supports audiences of recent cart abandoners that can be synced to ad platforms. Klaviyo Help Center Klaviyo Help Center

klaviyo.com

Customer.io gives you more granular event-based control. Its cart-abandonment implementation can wait for either a purchase/cart update or a maximum elapsed time, and event properties can determine which path someone takes. For example: wait 45 minutes → if purchased, exit → otherwise send reminder; then potentially branch again based on subsequent behavior. Customer.io Customer.io

customer.io

What a customizable setup could look like

You could implement something like:

ADD_TO_CART
    │
    ├── Purchase within 30 min → EXIT
    │
    └── Still no purchase after 30 min
             │
             ├── Product value > $200 → wait 4h → Email
             │
             ├── Product value ≤ $200 → wait 2h → Email
             │
             └── No purchase after 24h
                       │
                       ├── Viewed product again → Retargeting Ad
                       ├── Engaged with email → SMS
                       └── No engagement → Ad audience

You can also add rules such as:

• Don't retarget someone more than once every 7 days.
• Suppress everyone immediately after PURCHASE.
• Different delays based on product/category/cart value.
• Trigger only for logged-in or identifiable visitors.
• Use different messaging for first-time vs. repeat customers.
• Stop the sequence when the cart changes.
• Run different timing variants for A/B testing.

Customer.io explicitly supports event-property filters and configurable automation frequencies, while Klaviyo supports flow filters and time delays for this type of logic. Customer.io Klaviyo Help Center

If you tell me your stack (e.g. Shopify + Meta Ads, WooCommerce, custom site, etc.) and whether you want email/SMS, paid ads, or both, I can narrow this down to the most suitable 2–3 options and show exactly how I'd implement the trigger/time-window logic.

Customer.io gives you more granular event-based control. Its cart-abandonment implementation can wait for either a purchase/cart update or a maximum elapsed time, and event properties can determine which path someone takes. For example: wait 45 minutes → if purchased, exit → otherwise send reminder; then potentially branch again based on subsequent behavior. docs.customer.io docs.customer.io

customer.io

What a customizable setup could look like

You could implement something like:

ADD_TO_CART
    │
    ├── Purchase within 30 min → EXIT
    │
    └── Still no purchase after 30 min
             │
             ├── Product value > $200 → wait 4h → Email
             │
             ├── Product value ≤ $200 → wait 2h → Email
             │
             └── No purchase after 24h
                       │
                       ├── Viewed product again → Retargeting Ad
                       ├── Engaged with email → SMS
                       └── No engagement → Ad audience

You can also add rules such as:

Yes. If your main requirement is cart-abandonment retargeting with precise time windows and behavioral triggers, I’d shortlist these:

My top picks

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger from events such as Started Checkout or Added to Cart, add delays in minutes/hours/days, and use filters such as "has not placed an order since entering the flow." You can also branch the journey based on customer behavior and combine email, SMS, and push. Klaviyo Help Center Klaviyo Help Center

For example:

Added to Cart → wait 2 hours → still no purchase? → email → wait 20 hours → still no purchase? → SMS → wait 2 days → incentive

Klaviyo specifically recommends roughly 2–4 hours before the first abandoned-cart message and another message 20–48 hours later as a starting point, although you can customize this. Klaviyo Help Center

help.klaviyo.com

2. Customer.io — best if your triggers are unusually sophisticated

Customer.io is particularly strong if you want logic like:

"Start when cart_updated occurs → wait 45 minutes → check whether cart changed → check whether purchase occurred → only send if neither happened."

Its event-triggered automations let you filter based on event properties, and its cart-abandonment workflow supports explicit wait conditions and exit logic. Customer.io Customer.io

docs.customer.io

What I'd choose

• Shopify/DTC brand: Klaviyo
• You need complex behavioral logic: Customer.io
• Large enterprise with many channels and journeys: Braze
• You want something easier to operate than the above: Omnisend

One important technical consideration: event-data latency matters. If your "wait 30 minutes, then check whether they purchased" logic depends on ecommerce events arriving quickly, the platform/integration needs to sync purchases quickly enough to suppress the retargeting message. Klaviyo explicitly warns about this issue. Klaviyo Help Center Klaviyo Developers

If you tell me your stack (e.g. Shopify + Meta/Google Ads, Shopify + email/SMS, custom ecommerce site, etc.), I can narrow this down to the best 2–3 tools and show exactly how I'd build the abandonment workflow and retargeting windows.

For example:

Added to Cart → wait 2 hours → still no purchase? → email → wait 20 hours → still no purchase? → SMS → wait 2 days → incentive

Klaviyo specifically recommends roughly 2–4 hours before the first abandoned-cart message and another message 20–48 hours later as a starting point, although you can customize this. Klaviyo Help Center

help.klaviyo.com

2. Customer.io — best if your triggers are unusually sophisticated

Customer.io is particularly strong if you want logic like:

"Start when cart_updated occurs → wait 45 minutes → check whether cart changed → check whether purchase occurred → only send if neither happened."

Its event-triggered automations let you filter based on event properties, and its cart-abandonment workflow supports explicit wait conditions and exit logic. docs.customer.io docs.customer.io

Yes. If your key requirement is customizable time windows + event-based triggers/conditions, I’d shortlist these:

My recommendation

If you want maximum control: Customer.io. Its cart-abandonment workflow can trigger on a cart_updated event, wait a configurable amount of time, check whether the cart changed or a purchase occurred, and then branch accordingly. Their current documentation even demonstrates a 45-minute abandonment window. Customer.io Customer.io

If you're running a Shopify/ecommerce store: Klaviyo is probably the easiest strong choice. You can trigger on Started Checkout or Added to Cart, add purchase/recency filters, and configure multiple delays. Klaviyo specifically supports different timing windows and recommends testing roughly 2–4 hours for the first message and another 20–48 hours later. Klaviyo Help Center Klaviyo Help Center

If you want something simpler: Omnisend has dedicated abandoned-cart/checkout automations and lets you configure an inactivity period before considering the cart abandoned, plus trigger filters based on things such as cart quantity. Omnisend Help Center

A workflow I'd build

For example:

Added to Cart
→ wait 60 min
→ Has purchased? → yes: stop
→ no: continue
→ Cart value > $100?
→ wait 3 hours
→ Email #1
→ wait 20 hours
→ Still hasn't purchased?
→ Email #2 / SMS
→ wait 48 hours
→ Retargeting audience / final message

For that exact level of logic, Customer.io or Klaviyo would be my first two choices. Klaviyo also lets you create recent-cart-abandoner segments that can be synced to advertising audiences, so you can extend the strategy beyond email/SMS. Klaviyo Help Center

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.), monthly traffic/orders, and whether you want email/SMS/Meta/Google retargeting, I can narrow this down to the best 2–3 options and compare pricing, trigger flexibility, and implementation effort.

If you need cart abandonment retargeting with customizable time windows, event triggers, branching logic, and multi-channel campaigns, look for customer engagement platforms rather than simple “abandoned cart email” plugins. Good options:

Strongest choices by use case

• Shopify/DTC store: Klaviyo or Omnisend - Example flow: - Trigger: Added to Cart
• Wait: 45 minutes
• Condition: cart value > $100?
• Branch A: VIP customer → personal message
• Branch B: new customer → incentive
• Exit: purchase completed

Klaviyo Help Center Omnisend Help Center- You have custom ecommerce software or need unusual logic: Customer.io

• You can send cart data as events/attributes and build flows around your own rules, such as “send only if cart exists after 90 minutes and inventory is still available.” Customer.io
• Enterprise app + website retargeting: Braze or Iterable

Features to prioritize

Look for:

• Event-based triggers

• Added to cart
• Started checkout
• Viewed product
• Payment failed
• Returned to site
• Flexible timing

• 15 minutes, 1 hour, 4 hours, 24 hours, 7 days
• “Wait until” conditions (e.g., wait until weekday morning)
• Exit conditions

• Stop messaging immediately after purchase
• Remove users who clear their cart
• Segmentation

• Cart value
• Product category
• Customer lifetime value
• New vs returning customer
• Geography
• Retargeting integrations

• Sync abandoned-cart audiences to ad platforms
• Coordinate email/SMS with paid ads

For most online stores, I’d shortlist:

1. Klaviyo — best overall ecommerce cart recovery flexibility
2. Customer.io — best if you need custom engineering-level control
3. Omnisend — best if you want a simpler ecommerce-focused setup

Klaviyo Help Center Customer.io Omnisend Help CenterIf you tell me your stack (Shopify, WooCommerce, custom site, mobile app, etc.) and whether you want email only vs email/SMS/ads, I can narrow it down.

If your priority is customizable time windows + event-based triggers, I’d shortlist these:

My recommendation

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger a flow from events such as Started Checkout, add delays, branch based on customer attributes or behavior, and stop the flow when someone purchases. Its abandoned-cart tooling supports multiple messages and customizable delays; Klaviyo currently recommends roughly 2–4 hours before the first reminder, but you can configure your own cadence. Klaviyo Help Center Klaviyo Help Center

It's particularly good if you want something like:

• Cart abandoned → wait 45 minutes
• If order completed → exit
• Otherwise → email
• Wait 12 hours
• If cart value > $100 → SMS
• Wait 2 days
• If still no purchase → retargeting audience
• Don't re-enter the flow for 30 days

Klaviyo can also create recent-cart-abandoner segments for advertising audiences such as Facebook Custom Audiences. Klaviyo Help Center

2. Customer.io — best if your triggers are unusually complex

Customer.io is probably the strongest choice if you mean truly customizable triggers rather than just a configurable abandoned-cart template. Its event-triggered automations can use cart events, wait conditions, purchase events, and branching logic. Their current cart-abandonment example, for instance, triggers on a cart_updated event and waits until either the cart changes/purchase happens or a maximum time such as 45 minutes is reached. Customer.io

This is a particularly good fit if you want to define your own events such as:

product_added → cart_updated → checkout_started → payment_failed → purchase_completed

and build retargeting logic around those events.

3. Omnisend — easiest ecommerce-oriented alternative

Omnisend has dedicated abandoned-cart and abandoned-checkout automations, including trigger filters, inactivity periods, exit conditions, delays, and branching based on things such as cart value. Its current tooling even lets you set an inactivity timer so the workflow waits for the shopper to finish modifying their cart before starting the abandonment sequence. Omnisend Help Center Omnisend API

What I'd choose

• Shopify + want powerful marketing automation: Klaviyo
• Need arbitrary/custom behavioral triggers: Customer.io
• Want something simpler to implement: Omnisend
• Large enterprise / complex omnichannel lifecycle: Braze

The key distinction is that Klaviyo and Omnisend are ecommerce-first, whereas Customer.io is more event/workflow-engine-first. If you tell me your stack (e.g. Shopify, WooCommerce, custom website, Salesforce, etc.) and whether you want email, SMS, Meta/Google ads, or all of them, I can narrow this to the best 2–3 options and compare pricing/integration effort.

This is a particularly good fit if you want to define your own events such as:

product_added → cart_updated → checkout_started → payment_failed → purchase_completed

and build retargeting logic around those events.

3. Omnisend — easiest ecommerce-oriented alternative

Yes. If customizable time windows + event-based triggers are the priorities, I’d shortlist these:

My top picks

1. Klaviyo — best overall for ecommerce

You can trigger on events such as Started Checkout, insert arbitrary delays, add conditional branches, and stop the sequence when a purchase occurs. Klaviyo currently recommends roughly 2–4 hours before the first abandoned-cart message, but you can customize the timing. Klaviyo Help Center Klaviyo Help Center

It can also create segments of recent cart abandoners for advertising audiences, including Facebook Custom Audiences. Klaviyo Help Center

klaviyo.com

2. Customer.io — best if you want sophisticated trigger logic

This is probably the strongest choice if by "customizable" you mean things like:

Add to cart → wait 45 minutes → if cart still exists AND no purchase → send email → wait 12 hours → if cart value > $100 → send SMS → otherwise exit.

Customer.io's workflow system supports conditions, Wait Until, maximum wait times, cart attributes, purchase checks, and configurable re-entry. Customer.io

customer.io

3. Omnisend — best straightforward ecommerce option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows, configurable inactivity periods, trigger filters, exit conditions, delays, and frequency/re-entry controls. Omnisend Help Center Omnisend Help Center

Its particularly useful feature is inactivity-based triggering: you can wait until someone has been inactive for a specified period rather than simply firing X minutes after the cart event. Omnisend Help Center

omnisend.com

What I'd choose

• Shopify/DTC brand: Klaviyo
• Need very complex conditional automation: Customer.io
• Want something simpler to deploy: Omnisend
• Enterprise, very high event volume, sophisticated orchestration: Braze

One important distinction: if by "retargeting" you specifically mean paid ads, rather than email/SMS recovery, I'd narrow the list differently. Klaviyo, for example, can sync cart-abandoner segments to ad audiences, while Customer.io can give you more programmable control over downstream destinations.

If you tell me your store/platform (Shopify, WooCommerce, custom, etc.), channels (Meta ads, Google ads, email, SMS), and the kind of trigger logic you need, I can recommend the best 2–3 options and show exactly how I'd build the abandonment workflow.

It can also create segments of recent cart abandoners for advertising audiences, including Facebook Custom Audiences. Klaviyo Help Center

klaviyo.com

2. Customer.io — best if you want sophisticated trigger logic

This is probably the strongest choice if by "customizable" you mean things like:

Add to cart → wait 45 minutes → if cart still exists AND no purchase → send email → wait 12 hours → if cart value > $100 → send SMS → otherwise exit.

Customer.io's workflow system supports conditions, Wait Until, maximum wait times, cart attributes, purchase checks, and configurable re-entry. docs.customer.io

customer.io

3. Omnisend — best straightforward ecommerce option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows, configurable inactivity periods, trigger filters, exit conditions, delays, and frequency/re-entry controls.

Its particularly useful feature is inactivity-based triggering: you can wait until someone has been inactive for a specified period rather than simply firing X minutes after the cart event.

If you need cart abandonment retargeting with customizable time windows, triggers, filters, and multi-channel follow-ups, look for platforms with a visual automation builder rather than basic “send an email after 24 hours” tools. Good options:

Common cart abandonment setups these tools can handle

Simple recovery

• 30–60 minutes: “You left something behind”
• 12–24 hours: reminder + social proof
• 2–5 days: incentive or urgency message

High-value cart flow

• Trigger only if cart value > $100
• Wait 1 hour
• Send personalized email
• Wait 24 hours
• Offer discount only if no purchase

Customer-tier flow

• VIP customers → no discount, concierge message
• New visitors → education + incentive
• Repeat buyers → loyalty reminder

Channel escalation

1. Email after abandonment
2. SMS if unopened
3. Push notification for app users
4. Retargeting audience sync for ads

My shortlist by use case

• Shopify / DTC brand: Klaviyo or Omnisend
• Need the most customization without enterprise complexity: Klaviyo
• Need SMS + email automation quickly: Omnisend
• Mobile app with behavioral events: Braze
• Large enterprise lifecycle marketing: Salesforce Marketing Cloud or Adobe Journey Optimizer

For most ecommerce teams, the deciding features are:

• Can it trigger from Added to Cart vs Started Checkout?
• Can you set different delays by segment?
• Can you suppress users after purchase immediately?
• Can you branch based on cart value, product category, customer history, or engagement?

Klaviyo and Omnisend both specifically support these kinds of abandonment workflows and conditional logic. Klaviyo Help Center Omnisend Help Center

If you tell me your stack (Shopify, WooCommerce, custom site, mobile app, etc.) and channels (email/SMS/push/ads), I can narrow this down.

Yes. If customizable time windows + event-based triggers are the priorities, I’d shortlist these:

My pick: Klaviyo

Klaviyo lets you trigger an abandonment flow from checkout/cart activity, wait a configurable amount of time, then branch based on conditions such as purchase history or whether the customer has subsequently ordered. Its current documentation recommends roughly 2–4 hours for the first abandonment message, but you can customize the timing. Klaviyo Help Center Klaviyo Help Center

It can also create recent-cart-abandoner segments and sync those audiences to advertising platforms such as Facebook Custom Audiences, so you can combine email/SMS recovery with paid retargeting. Klaviyo Help Center

klaviyo.com

Customer.io — best if you want maximum logic

Customer.io is particularly attractive if your definition of "abandoned" is more complicated than simply "added to cart and didn't purchase."

For example, you can build:

Added to cart → wait 45 min → still has cart? → send email → wait 20 hrs → still hasn't purchased? → SMS → wait 3 days → enter retargeting audience

Its cart-abandonment workflow supports configurable delays, re-entry frequency, and exit conditions when the cart becomes empty or the person purchases. Customer.io

customer.io

Omnisend — best simpler ecommerce option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows, including trigger filters, inactivity periods, conditional splits, and customizable delays. Its inactivity setting is especially useful if you want something like "wait until the shopper has been inactive for 60 minutes before considering the cart abandoned." Omnisend Help Center Omnisend API

omnisend.com

What I'd choose

• Shopify + sophisticated marketing: Klaviyo
• Complex/custom behavioral logic: Customer.io
• Shopify + easier implementation: Omnisend
• Need paid-ad retargeting audiences as part of the workflow: Klaviyo is especially compelling. Klaviyo Help Center

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and channels (Meta ads, Google ads, email, SMS, push), I can narrow this to the best 2–3 options and show exactly how I'd configure the abandonment triggers and timing.

Klaviyo lets you trigger an abandonment flow from checkout/cart activity, wait a configurable amount of time, then branch based on conditions such as purchase history or whether the customer has subsequently ordered. Its current documentation recommends roughly 2–4 hours for the first abandonment message, but you can customize the timing. Klaviyo Help Center Klaviyo Help Center

It can also create recent-cart-abandoner segments and sync those audiences to advertising platforms such as Facebook Custom Audiences, so you can combine email/SMS recovery with paid retargeting. Klaviyo Help Center

klaviyo.com

Customer.io — best if you want maximum logic

Customer.io is particularly attractive if your definition of "abandoned" is more complicated than simply "added to cart and didn't purchase."

For example, you can build:

Added to cart → wait 45 min → still has cart? → send email → wait 20 hrs → still hasn't purchased? → SMS → wait 3 days → enter retargeting audience

Its cart-abandonment workflow supports configurable delays, re-entry frequency, and exit conditions when the cart becomes empty or the person purchases. docs.customer.io

customer.io

Omnisend — best simpler ecommerce option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows, including trigger filters, inactivity periods, conditional splits, and customizable delays. Its inactivity setting is especially useful if you want something like "wait until the shopper has been inactive for 60 minutes before considering the cart abandoned."

Yes. If you need cart-abandonment retargeting with configurable time windows, behavioral triggers, conditions, and multi-channel follow-up, there are several good options.

Best options

1. customer.io — best for maximum trigger control

This is probably the best fit if customizable logic is your priority.

You can trigger a journey from events such as cart_updated, wait a specified amount of time, then check whether the cart changed or a purchase occurred before continuing. Customer.io's current cart-abandonment recipe explicitly supports event-triggered workflows and configurable wait periods. Customer.io

For example:

• Added to cart
• Wait 45 minutes
• If purchased → stop
• If cart changed → restart/recalculate
• If cart value > $100 → VIP sequence
• Otherwise → reminder
• Wait 24 hours
• If still abandoned → another channel
• Suppress anyone who purchased

That's a very flexible model if you're building sophisticated lifecycle logic.

2. klaviyo.com — best ecommerce choice

I'd choose Klaviyo if you're primarily running Shopify/BigCommerce or another ecommerce store and want sophisticated automation without building as much infrastructure yourself.

Klaviyo supports triggers such as Started Checkout or Added to Cart, flow filters, time delays, conditional logic, and suppression after purchase. Its current documentation recommends roughly 2–4 hours for the first abandonment message, followed by another message 20–48 hours later, but those windows are configurable. Klaviyo Help Center

It can also create a recent cart-abandoner audience for Facebook Custom Audiences, which makes it particularly relevant if by "retargeting" you specifically mean paid social ads, rather than just email/SMS. Klaviyo Help Center

3. omnisend.com — easier ecommerce implementation

Omnisend has dedicated Abandoned Cart and Abandoned Checkout workflows. You can configure trigger filters, exit conditions, inactivity periods, delays, and conditional splits. Omnisend Help Center

One particularly useful feature is Trigger Inactivity Time: you can tell Omnisend to wait until someone has been inactive for a particular period before considering the cart abandoned. Omnisend Help Center

That's useful if you don't want someone to get a retargeting message 10 minutes after adding an item when they're still actively shopping.

4. dynamicyield.com — best for sophisticated paid/web personalization

If you're talking about true retargeting across advertising, website personalization, email, push, and other channels, Dynamic Yield is worth looking at.

Its cart-abandonment capabilities include real-time behavioral triggers and retargeting campaigns in addition to email, push, and onsite experiences. Mastercard

I'd put this more in the enterprise/advanced personalization category than the straightforward Shopify-app category.

What I'd pick

If your requirement is specifically:

"When someone abandons a cart, wait X minutes/hours, check certain conditions, then retarget them differently depending on behavior."

I'd shortlist:

Customer.io → maximum flexibility
Klaviyo → best ecommerce balance
Omnisend → easiest/cheaper ecommerce implementation
Dynamic Yield → sophisticated cross-channel/advertising personalization

A particularly powerful architecture is:

Store events → Customer.io/Klaviyo → audience/decision logic → Meta/Google retargeting + email/SMS

For example, you could have 15-minute, 2-hour, 24-hour, and 7-day windows, with different audiences and suppression rules at each stage.

If you tell me what platform your store is on (Shopify, WooCommerce, custom, etc.) and whether you mean Meta/Google ads, email/SMS, or both, I can narrow this down to the 3 best tools and show exactly how I'd build the trigger logic.

Yes. If by cart abandonment retargeting you mean “when someone adds to cart/starts checkout, wait a configurable amount of time, check whether they purchased, then retarget them through email/SMS/push/ads,” there are several good options.

Best options

My recommendation

For most ecommerce businesses: Klaviyo. Its flow builder can trigger on Added to Cart or Started Checkout, apply filters such as “has not placed an order,” and insert delays measured in minutes, hours, or days. You can also branch based on things like cart value, customer status, product type, or engagement. Klaviyo Help Center Klaviyo Help Center Klaviyo SG

For example, you could build:

Added to Cart → wait 2 hours → hasn't purchased? → email → wait 20 hours → still hasn't purchased? → SMS → wait 2 days → high-value cart? → personalized offer

Klaviyo specifically documents abandoned-cart flows with configurable delays and purchase-based exit conditions. Klaviyo Help Center

klaviyo.com

Customer.io is probably the better choice if your triggers are more sophisticated than standard ecommerce events. Its event-triggered automations can use event attributes as filters, while its “Wait Until” functionality lets you wait for a condition/event or until a maximum amount of time has elapsed. Customer.io Customer.io

docs.customer.io

One important distinction

If you specifically mean paid-ad retargeting—e.g. “add to cart → wait 6 hours → add person to Meta/Google audience → remove them immediately after purchase”—I'd evaluate the software differently. Klaviyo/Customer.io are excellent for owned-channel retargeting, but an audience/CDP platform or ad-specific integration may be better for controlling paid-media audiences.

If you tell me whether you're using Shopify, WooCommerce, a custom site, or something else, I can narrow this down to the 3 best platforms and show exactly how I'd configure the abandonment triggers and time windows.

Yes. If your key requirements are custom time windows + event-based triggers + conditional logic, I’d shortlist these:

My recommendation

Klaviyo is probably the best starting point if you're running an ecommerce store. You can build something like:

Added to Cart → wait 2 hours →
if no purchase → email → wait 20 hours →
if cart value > $100 → VIP/incentive message → otherwise standard reminder →
wait 48 hours → SMS →
exit immediately when Placed Order occurs.

Klaviyo specifically supports customizable time delays and conditional splits in abandoned-cart flows, and its segments can also be used to target cart abandoners on advertising platforms. help.klaviyo.comdocs.customer.iohelp.klaviyo.com

Customer.io is the stronger choice if you need very granular, developer-oriented event logic. Its event-triggered automations can filter on event properties, control how often someone can re-enter, and use exit conditions so the workflow stops when the cart is no longer abandoned. docs.customer.io

Omnisend is a nice middle ground. Its abandonment workflows have explicit trigger filters, inactivity timers, delays, exit conditions, and conditional splits. Its inactivity timer can reset when additional cart activity occurs, which is particularly useful if shoppers modify their carts over multiple sessions. support.omnisend.com

If you mean paid-ad retargeting specifically

There's an important distinction:

• Email/SMS abandonment: Klaviyo, Customer.io, Omnisend
• Facebook/Instagram/Google retargeting audiences: Klaviyo and a CDP/customer-data platform can be more appropriate
• Complex cross-channel orchestration: Customer.io is worth a close look

For example, Klaviyo supports creating a recent cart abandoners segment and syncing it to Facebook Custom Audiences, while its flow system handles the real-time messaging side. help.klaviyo.comdocs.customer.iohelp.klaviyo.com

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.), channels (Meta ads, Google ads, email, SMS), and the exact trigger logic you want, I can narrow this to the 2–3 best options and show how I'd implement the workflow in each.

Yes. If you want cart-abandonment retargeting with precise time windows and event-based triggers, I’d shortlist these:

My top two

1. Klaviyo — easiest e-commerce choice

Klaviyo lets you trigger an abandonment flow from events such as Started Checkout or Added to Cart, then add arbitrary delays, filters, and conditional branches. You can, for example, wait 2 hours → check whether they purchased → send email → wait another 24 hours → send SMS. Klaviyo Help Center Klaviyo Help Center

It also supports safeguards such as "hasn't been in this flow in X days" and checking whether the customer has placed an order since entering the flow. Klaviyo Help Center

klaviyo.com

2. Customer.io — best if you want maximum trigger flexibility

Customer.io is particularly interesting if you want to define your own events rather than relying on a standard "abandoned cart" concept. Its current cart-abandonment documentation shows an event-triggered workflow where you can wait a specified period, check whether the cart changed or a purchase occurred, and then send the reminder. Customer.io

For example, you could implement:

cart_updated
   ↓
Wait up to 45 minutes
   ↓
Did cart change? ── Yes → Exit
   ↓ No
Did purchase happen? ── Yes → Exit
   ↓ No
Send reminder
   ↓
Wait 24 hours
   ↓
Still no purchase?
   ↓
Send second reminder

That makes Customer.io my pick if "customizable triggers and timing" is the primary requirement, rather than simply having a standard abandoned-cart campaign.

customer.io

If by "retargeting" you mean paid ads

That's a slightly different setup. You'd typically want your commerce/event platform to identify the abandoned-cart audience and then sync that audience to advertising platforms, while controlling how long someone remains eligible.

If you tell me your store/platform (Shopify, WooCommerce, custom site, etc.) and whether you mean email/SMS retargeting, paid Facebook/Instagram/Google ads, or both, I can recommend the best architecture and specific software stack.

Yes. If customizable time windows + behavioral triggers are the priority, I’d shortlist these:

My top two

1. Klaviyo — easiest choice for ecommerce

Klaviyo lets you trigger flows from events such as Added to Cart or Started Checkout, then add delays, conditional splits, and purchase-based exit criteria. You can set delays in minutes, hours, or days and build different paths based on customer behavior. Klaviyo Help Center Klaviyo Help Center

For example:

Added to Cart → wait 45 min → if no purchase → email → wait 20 hrs → if cart value > $100 → SMS → wait 2 days → retargeting audience

It can also create a segment of recent cart abandoners and sync that audience to Facebook Custom Audiences for paid retargeting. Klaviyo Help Center

2. Customer.io — best if you want maximum trigger logic

Customer.io is particularly strong if your definition of "abandoned cart" is more sophisticated than simply "added to cart and didn't buy." Its event-triggered workflows can use event properties as filters, and its Wait Until functionality lets you wait for a behavior or until a maximum amount of time has elapsed. Customer.io Customer.io

For example:

cart_updated → wait until purchase/cart change OR 45 min maximum → if still abandoned → send email → wait until 24h → branch based on cart value → SMS/push

That gives you much more control over edge cases.

What I'd choose

• Shopify/DTC brand: Klaviyo
• Complex custom ecommerce/app: Customer.io
• Large enterprise with sophisticated cross-channel orchestration: Braze
• Smaller ecommerce operation wanting simpler implementation: Omnisend

One important distinction: if by "retargeting" you specifically mean paid ads, rather than email/SMS, make sure the platform can synchronize the abandonment audience to your ad platform and, critically, remove the user from the audience immediately after purchase. For email/SMS, Klaviyo and Customer.io give you particularly strong control over those suppression/exit conditions. Klaviyo Help Center Customer.io

If you tell me your store/platform (Shopify, WooCommerce, custom, etc.), I can narrow this to the best 2–3 options and show exactly how I'd build the abandonment logic, including triggers like cart value, product category, customer type, and 30-min/2-hr/24-hr windows.

For example:

Added to Cart → wait 45 min → if no purchase → email → wait 20 hrs → if cart value > $100 → SMS → wait 2 days → retargeting audience

It can also create a segment of recent cart abandoners and sync that audience to Facebook Custom Audiences for paid retargeting. Klaviyo Help Center

2. Customer.io — best if you want maximum trigger logic

Customer.io is particularly strong if your definition of "abandoned cart" is more sophisticated than simply "added to cart and didn't buy." Its event-triggered workflows can use event properties as filters, and its Wait Until functionality lets you wait for a behavior or until a maximum amount of time has elapsed.

For example:

Yes. If your main requirement is cart-abandonment retargeting with precise timing + customizable behavioral triggers, I’d shortlist these:

1. Klaviyo — best overall

Klaviyo lets you build flows around events such as Started Checkout, add delays, conditional splits, and filters such as "Placed Order zero times since starting this flow." You can also build segments of recent cart abandoners and sync them to advertising audiences. Klaviyo Help Center Klaviyo Help Center

A flow could look like:

Started Checkout → wait 2 hours → hasn't purchased? → email → wait 20 hours → still hasn't purchased? → SMS → wait 3 days → retargeting audience

Klaviyo is particularly attractive if you want the marketing team to build and modify these flows without engineering.

klaviyo.com

2. Customer.io — best for complex trigger logic

I'd choose Customer.io if by "customizable triggers" you mean really arbitrary business logic.

Its cart-abandonment workflow can use event data, conditions, "Wait Until" logic, maximum wait times, and exit conditions. For example, you can wait 45 minutes, check whether the cart has changed or a purchase occurred, and stop the workflow accordingly. Customer.io

This makes it well suited to logic like:

• Cart value > $100
• Customer is new vs. returning
• Product belongs to category X
• Customer has purchased before
• Cart was updated after the initial abandonment
• No purchase within 2 hours
• Customer is eligible for SMS
• Different cadence based on customer lifetime value

customer.io

3. Omnisend — best ecommerce-focused alternative

Omnisend has dedicated Abandoned Cart and Abandoned Checkout automations. You can customize trigger filters, inactivity periods, workflow timing, conditional splits, and exit conditions. It even supports an inactivity window so that the system waits for the shopper to finish adding products before triggering the automation. Omnisend Help Center

It's a good choice if you want sophisticated enough automation without building a very technical customer-journey system.

omnisend.com

4. Braze — best enterprise option

Braze is worth considering if you're building a much broader real-time lifecycle system rather than just cart recovery. Its strength is sophisticated cross-channel orchestration and behavioral segmentation.

braze.com

What I'd pick

For most Shopify/ecommerce businesses: Klaviyo

For maximum trigger/logic flexibility: Customer.io

For simpler ecommerce automation: Omnisend

For a large enterprise with complex omnichannel journeys: Braze

One important distinction: if by "retargeting" you specifically mean Facebook/Instagram/Google ads, rather than email/SMS retargeting, the architecture changes slightly. Klaviyo, for example, can create a recent-cart-abandoner segment and sync it to Facebook Custom Audiences. Klaviyo Help Center

If you tell me your store platform (Shopify, WooCommerce, custom, etc.) + channels (Meta ads, Google ads, email, SMS) + the timing/trigger rules you want, I can recommend the best stack and map out the exact automation.

If you need cart abandonment retargeting with customizable time windows, triggers, branching logic, and multi-channel follow-up, look for platforms that support event-based automation rather than just a single “send email after X hours” feature. Good options include:

If you specifically need custom windows and triggers, prioritize these features:

• Event triggers

• Added to cart
• Started checkout
• Viewed product again
• Returned to site
• Discount code used
• Inventory changed
• Customer segment changed
• Timing controls

• 15 minutes after abandonment
• 2 hours after abandonment
• 24-hour reminder
• 7-day win-back
• Business-hour send windows
• Frequency caps
• Conditional logic

• “If cart value > $200, send VIP offer”
• “If customer purchased before, use loyalty messaging”
• “If item is low stock, create urgency”
• “Stop sequence immediately after purchase”
• Cross-channel retargeting

• Email
• SMS
• Push notifications
• Paid ad audiences (Meta/Google)
• On-site popups

Common setups

Small Shopify store

• Klaviyo or Omnisend
• Example flow: - 1 hour: reminder email
• 24 hours: social proof/reviews
• 72 hours: incentive offer

Growing ecommerce brand

• Klaviyo + paid audience syncing
• Add segmentation: - High-value carts → personal outreach
• First-time visitors → education
• Repeat buyers → loyalty messaging

Enterprise

• Braze, Salesforce Marketing Cloud, or Dynamic Yield

If you tell me your platform (Shopify, WooCommerce, Magento, custom site, etc.), traffic volume, and whether you want email only vs email + ads + SMS, I can narrow this to the best-fit tools.

Yes. If your priority is cart-abandonment retargeting with precise timing and event-based triggers, I’d shortlist these:

My top two

1. Klaviyo — best overall for ecommerce

Klaviyo can trigger flows from events such as Started Checkout or Added to Cart, then apply filters, conditional splits, and delays. You can specify delays in minutes, hours, or days, and even schedule around particular times/days. Klaviyo Help Center Klaviyo Help Center

For example:

Cart started → wait 2 hours → still no purchase? → email
→ wait 20 hours → still no purchase? → SMS
→ wait 2 days → high-value cart? → personalized offer

It also lets you branch based on cart value, product category, customer status, purchase history, etc. Klaviyo

klaviyo.com

2. Customer.io — best if you want maximum trigger flexibility

Customer.io is particularly strong if you have your own events/data pipeline. Its event-triggered automations can use event properties as conditions, and its cart-abandonment workflow supports waiting for a specified period while checking whether the cart changed or a purchase occurred. Customer.io Customer.io

That makes it excellent for logic like:

cart_updated → wait 45 minutes →
IF cart changed → exit
IF purchase occurred → exit
ELSE → send reminder

You can also pass the complete cart contents into the event and dynamically personalize the message. Customer.io

customer.io

Which I'd choose

• Shopify/ecommerce team wanting something powerful but relatively easy: Klaviyo
• You have developers and want arbitrary behavioral triggers: Customer.io
• Enterprise-scale marketing across email, push, SMS, web, etc.: Braze
• Want a simpler ecommerce-focused tool: Omnisend
• Already deeply invested in CRM/sales automation: HubSpot

One important distinction: if by “retargeting” you specifically mean paid ads on Meta/Google, rather than email/SMS/web push, the architecture changes. You'd want a platform that can synchronize the abandonment audience to ad platforms and control audience entry/exit windows—e.g. “entered cart abandonment 1–3 days ago, but exclude anyone who purchased.”

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and whether you mean email/SMS or paid ads, I can narrow this to the 2–3 best options and show exactly how I'd implement the trigger logic.

For example:

Cart started → wait 2 hours → still no purchase? → email
→ wait 20 hours → still no purchase? → SMS
→ wait 2 days → high-value cart? → personalized offer

It also lets you branch based on cart value, product category, customer status, purchase history, etc. Klaviyo

klaviyo.com

2. Customer.io — best if you want maximum trigger flexibility

Customer.io is particularly strong if you have your own events/data pipeline. Its event-triggered automations can use event properties as conditions, and its cart-abandonment workflow supports waiting for a specified period while checking whether the cart changed or a purchase occurred. docs.customer.io docs.customer.io

That makes it excellent for logic like:

cart_updated → wait 45 minutes →
IF cart changed → exit
IF purchase occurred → exit
ELSE → send reminder

You can also pass the complete cart contents into the event and dynamically personalize the message.

Yes. If your key requirement is cart-abandonment retargeting with configurable triggers and timing, I’d shortlist these:

My top picks

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger flows from events such as Started Checkout, add delays, conditional splits, and filters, and stop people from receiving messages when they purchase. Its current documentation specifically supports customized abandoned-cart flows and recommends roughly 2–4 hours before the first reminder, followed by another 20–48 hours later. Klaviyo Help Center Klaviyo Help Center

It can also create segments of recent cart abandoners and sync those audiences to Facebook Custom Audiences for ad retargeting. Klaviyo Help Center

A flow could look like:

Added to Cart → wait 1 hour → still no checkout? → email → wait 20 hours → still no purchase? → SMS → wait 3 days → retargeting audience

2. Customer.io — best if your triggers are highly custom

Customer.io is particularly interesting if you don't just want the standard "abandoned cart after X hours." You can build event-triggered automations, control re-entry frequency, use exit conditions, and add delays between messages. Its current cart-abandonment documentation even demonstrates a 45-minute delay and dynamically populated cart contents. Customer.io

I'd choose this if your logic looks more like:

Cart value > $100 AND customer has purchased before AND inventory available → wait 2h → email → wait until 10am next day → SMS → stop if purchase

3. Omnisend — easiest ecommerce-focused option

Omnisend has dedicated Abandoned Cart and Abandoned Checkout automations, customizable trigger filters, exit conditions, and an adjustable inactivity period. That last feature is particularly useful if you want to define exactly how long someone must be inactive before they're considered abandoned. Omnisend Help Center

What I'd pick

• Shopify/DTC brand: Klaviyo
• Need sophisticated behavioral logic: Customer.io
• Want something easier to configure: Omnisend
• Large enterprise with many channels: Braze

One important distinction: if by "retargeting" you specifically mean paid ads rather than email/SMS, I'd lean toward Klaviyo or Braze, or pair a customer-data/automation platform with your ad platform. Klaviyo, for example, explicitly supports building recent-cart-abandoner audiences for Facebook Custom Audiences. Klaviyo Help Center

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and the exact trigger logic you want, I can recommend the best stack and map out the automation.

It can also create segments of recent cart abandoners and sync those audiences to Facebook Custom Audiences for ad retargeting. Klaviyo Help Center

A flow could look like:

Added to Cart → wait 1 hour → still no checkout? → email → wait 20 hours → still no purchase? → SMS → wait 3 days → retargeting audience

2. Customer.io — best if your triggers are highly custom

Customer.io is particularly interesting if you don't just want the standard "abandoned cart after X hours." You can build event-triggered automations, control re-entry frequency, use exit conditions, and add delays between messages. Its current cart-abandonment documentation even demonstrates a 45-minute delay and dynamically populated cart contents. docs.customer.io

I'd choose this if your logic looks more like:

Cart value > $100 AND customer has purchased before AND inventory available → wait 2h → email → wait until 10am next day → SMS → stop if purchase

3. Omnisend — easiest ecommerce-focused option

Omnisend has dedicated Abandoned Cart and Abandoned Checkout automations, customizable trigger filters, exit conditions, and an adjustable inactivity period. That last feature is particularly useful if you want to define exactly how long someone must be inactive before they're considered abandoned.

What I'd pick

Yes. If customizable time windows + event-based triggers are the priority, I’d shortlist these:

1. Klaviyo — probably the best fit

Klaviyo lets you build flows around events such as Added to Cart or Started Checkout, then add delays, conditional filters, and purchase-based exit conditions. You can, for example:

• Trigger when Added to Cart
• Wait 2 hours
• Check whether Placed Order happened
• If not, send email
• Wait another 20 hours
• Check cart/order value
• Send SMS only to qualifying customers
• Stop the journey immediately after purchase

Klaviyo specifically supports customizable flow filters and time delays, and its current documentation recommends roughly 2–4 hours before the first abandoned-checkout message as a starting point. Klaviyo Help Center Klaviyo Developers

help.klaviyo.com

2. Omnisend — excellent and simpler

Omnisend is particularly good if you're on Shopify, BigCommerce, WooCommerce, or another supported ecommerce platform.

Its automation engine lets you specify:

• Trigger events — e.g. Added Product to Cart or Started Checkout
• Inactivity periods — e.g. don't consider the cart abandoned until there's been 1 hour of inactivity
• Trigger filters — e.g. cart contains >2 products
• Conditional splits
• Exit conditions — e.g. Placed Order
• Multiple delays and messages

Importantly, its current automation system supports up to 20 trigger filters per workflow, and its API supports inactivity-based triggers where subsequent cart activity resets the timer. Omnisend Help Center Omnisend API Omnisend Help Center

support.omnisend.com

3. Customer.io — best if your triggers are highly custom

I'd look at Customer.io if you're not just doing standard ecommerce abandonment.

It's particularly attractive if you want logic like:

"If someone adds a product worth >$100, doesn't purchase for 45 minutes, has visited the site twice in the last 7 days, and hasn't received a promotion in 30 days → enter retargeting sequence."

That's more of an event-driven customer journey problem than a conventional abandoned-cart problem.

4. Braze — enterprise option

Braze is worth considering if you have substantial engineering/marketing infrastructure and want extremely sophisticated behavioral orchestration across channels. It's generally overkill for a small ecommerce store, but powerful for large consumer apps and retailers.

What I'd choose

If your requirement is specifically:

"I want to define exactly what constitutes abandonment, choose the delay before retargeting, create multiple follow-ups, and stop/split the campaign based on what the customer does."

I'd rank them:

1. Klaviyo — best overall ecommerce choice
2. Omnisend — best balance of flexibility and simplicity
3. Customer.io — best for custom event logic
4. Braze — best for enterprise-scale orchestration

One important distinction: email/SMS cart recovery and paid-ad retargeting aren't necessarily the same thing. If by "retargeting" you mean showing the person Meta/Google/TikTok ads after they abandon, rather than sending them email/SMS, the ideal software stack is different.

I'd look at Customer.io if you're not just doing standard ecommerce abandonment.

It's particularly attractive if you want logic like:

"If someone adds a product worth >$100, doesn't purchase for 45 minutes, has visited the site twice in the last 7 days, and hasn't received a promotion in 30 days → enter retargeting sequence."

That's more of an event-driven customer journey problem than a conventional abandoned-cart problem.

4. Braze — enterprise option

Braze is worth considering if you have substantial engineering/marketing infrastructure and want extremely sophisticated behavioral orchestration across channels. It's generally overkill for a small ecommerce store, but powerful for large consumer apps and retailers.

What I'd choose

If your requirement is specifically:

"I want to define exactly what constitutes abandonment, choose the delay before retargeting, create multiple follow-ups, and stop/split the campaign based on what the customer does."

I'd rank them:

Yes. If customizable time windows + event-based triggers are the priorities, I’d shortlist these:

• Klaviyo — probably the best all-around choice for ecommerce. You can trigger on events such as Started Checkout or Added to Cart, add delays, conditional splits, purchase exclusions, frequency rules, and segment by customer/cart attributes. Its current documentation explicitly supports custom abandoned-cart flows and configurable delays. Klaviyo Help Center Klaviyo Help Center

klaviyo.com

• Customer.io — strongest if you want very granular workflow logic. You can trigger on a custom cart_updated event, then use conditions such as “cart changed,” “purchase occurred,” and a maximum wait period before sending. This is particularly good if you have a custom ecommerce stack or want unusual abandonment rules. Customer.io

customer.io

• Attentive — a good choice if SMS/RCS is central to your retargeting. Its journey builder supports delays plus restrictions on specific days and times of day. There are also specific constraints around abandonment messaging, including a 48-hour window for U.S. abandonment messages. Attentive

attentive.com

How I'd choose

For example, you could build a workflow like:

Added to cart → wait 45 min → still no purchase? → email → wait 20 hrs → high-value cart? → SMS → wait 2 days → Facebook/Google audience

Klaviyo can handle much of that natively, while Customer.io is particularly attractive if the trigger logic needs to be more sophisticated than a conventional abandoned-cart sequence. Klaviyo also supports using recent cart-abandoner segments for advertising audiences such as Facebook Custom Audiences. Klaviyo Help Center

My recommendation: start with Klaviyo unless you have a highly customized ecommerce/data stack. If you tell me your platform (e.g. Shopify, WooCommerce, custom site) and whether you want email, SMS, Meta/Google ads, or all three, I can narrow this down to the best 2–3 options and compare their trigger/time-window capabilities.

Yes. If customizable time windows + event-based triggers are the priority, I’d shortlist these:

• customer.io — Best for highly custom logic. You can trigger from cart events, use “Wait Until” conditions, branch based on whether the cart changed or a purchase occurred, and set a maximum wait time. For example: “Added to cart → wait 45 minutes → if no purchase and cart unchanged → send email → wait 20 hours → retarget again.” Customer.io
• klaviyo.com — Best overall for ecommerce. Its flows support checkout/cart triggers, delays, conditional splits, purchase suppression, and audience syncing for platforms such as Facebook Custom Audiences. You can build different sequences based on purchase history, cart value, product, etc. Klaviyo Help Center Klaviyo Help Center
• bloomreach.com — Best for sophisticated personalization. Its Engagement platform can trigger on cart updates, impose re-contact windows, and run recovery across email, SMS, and web personalization. Bloomreach Documentation Bloomreach
• attentive.com — Best if SMS is central. Journeys support cart-abandonment triggers, configurable waits, branches, days-of-week restrictions, and specific delivery windows. Attentive Attentive

How I'd choose

For example, if your desired logic is:

Add to cart → wait 30 min → if no purchase → retarget → if cart value > $100 use message A → otherwise B → wait 24h → if still no purchase → Facebook audience + email → suppress immediately when purchase occurs

Customer.io or Klaviyo would be my first two evaluations. Customer.io gives you especially granular event/workflow control, while Klaviyo is generally the more ecommerce-native choice. Klaviyo Help Center Customer.io

If you tell me your store platform (Shopify, WooCommerce, custom, etc.) and channels (email, SMS, Meta/Google ads, push), I can narrow this down to the best 2–3 options and explain exactly how each would implement your trigger logic.

Yes. If customizable time windows and triggers are the priority, I’d look at these first:

My recommendation: Klaviyo

For a typical ecommerce implementation, Klaviyo is probably the easiest fit. Its abandoned-cart flows can trigger from checkout activity, wait a configurable amount of time, and then use filters/splits to determine whether someone should receive the next message. You can, for example, wait 2 hours, check whether they purchased, then branch based on customer attributes or behavior. Klaviyo Help Center Klaviyo Help Center

It also supports creating recent-cart-abandoner audiences and syncing those audiences to advertising platforms, so you can combine email/SMS retargeting with paid social retargeting. Klaviyo Help Center

A fairly flexible setup could look like:

• Trigger: Added to Cart or Started Checkout
• Wait: 30 minutes / 2 hours / 4 hours
• Condition: Has not purchased since entering flow
• Branch: cart value > $100 vs. <$100
• Branch: first-time customer vs. repeat customer
• Message 1: reminder
• Wait: 20–24 hours
• Condition: still hasn't purchased
• Message 2: social proof or product benefits
• Wait: another 24–48 hours
• Message 3: incentive, only for selected segments
• Exit: immediately when purchase occurs

Klaviyo specifically recommends filtering out people who have placed an order after entering an abandoned-cart flow, which is important for preventing embarrassing "you forgot your cart" messages after someone has already bought. Klaviyo Help Center

When I'd choose Braze instead

If you're building something more like a complex customer decision engine rather than a standard ecommerce flow, Braze is worth considering. Its Canvas can use custom events, action paths with evaluation windows, and exit users when they perform a purchase—so you can construct fairly intricate "wait X hours, watch for Y event, then do Z" logic. Braze

When Attentive makes more sense

If SMS is central to the strategy, Attentive is particularly attractive. Its Journeys support an "Added to Cart" trigger, custom triggers, waits, branching, and configurable delivery windows. It explicitly supports wait periods such as 30–60 minutes for cart abandonment and 1–4 hours for follow-ups. Attentive Attentive

Bottom line:

• Klaviyo → best overall ecommerce choice
• Braze → best for highly sophisticated/custom behavioral orchestration
• Attentive → best if SMS is a major component
• Wunderkind → attractive if you want more turnkey abandonment optimization

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and channels (email, SMS, Meta/Google ads, push), I can narrow this to the 2–3 best options and compare their trigger/event flexibility, timing controls, audience syncing, and approximate cost.

When Attentive makes more sense

If SMS is central to the strategy, Attentive is particularly attractive. Its Journeys support an "Added to Cart" trigger, custom triggers, waits, branching, and configurable delivery windows. It explicitly supports wait periods such as 30–60 minutes for cart abandonment and 1–4 hours for follow-ups.

Yes. If your main requirement is cart-abandonment retargeting with configurable time windows and event-based triggers, I’d shortlist these:

1. Customer.io — best for maximum control

customer.io

This would be my first choice if customizable triggers and timing are the priority.

You can trigger a workflow from an event such as cart_updated, inspect properties of that event, wait a configurable amount of time, and branch based on what the shopper does afterward. Customer.io's current cart-abandonment recipe specifically demonstrates waiting 45 minutes and then checking whether the cart changed or a purchase occurred before sending. Customer.io Customer.io

For example:

cart_updated
   ↓
Wait 45 minutes
   ↓
Did cart change? ── YES → Exit
   ↓ NO
Did purchase occur? ── YES → Exit
   ↓ NO
Send email
   ↓
Wait 20 hours
   ↓
Still no purchase?
   ↓
Send SMS

You can also put conditions on event properties, so you could do things like:

• Cart value > $100 → different campaign
• Product category = shoes → different creative
• First-time customer → 10% incentive
• Returning customer → no discount
• Cart abandoned for 2 hours → email
• Still abandoned after 24 hours → SMS
• Purchase happens at any point → immediately exit

That's particularly powerful if you have your own ecommerce backend rather than relying entirely on Shopify's native events.

2. Klaviyo — best ecommerce-focused option

klaviyo.com

If you're on Shopify, BigCommerce, or another mainstream ecommerce platform, I'd seriously consider Klaviyo.

Its flows can trigger from events such as Started Checkout or Added to Cart, then use time delays, filters, and conditional splits. Klaviyo currently recommends roughly 2–4 hours before the first abandoned-cart message, followed by another message 20–48 hours later, but you can customize the timing. Klaviyo Help Center Klaviyo Help Center

It also supports segmentation such as:

Started Checkout
     ↓
Wait 2 hours
     ↓
Purchased since entering flow?
   YES → Exit
   NO
     ↓
Cart value > $150?
   YES → VIP/high-value message
   NO  → Standard message

Klaviyo is probably the best balance between sophistication and ease of use for a conventional ecommerce business.

3. Omnisend — easiest implementation

omnisend.com

Omnisend has dedicated Abandoned Cart and Abandoned Checkout automations. You can customize trigger filters, exit conditions, delays, and inactivity periods. Omnisend Help Center

One feature that's particularly relevant to your question is Trigger Inactivity Time. For example, you can tell it to wait until someone has been inactive for an hour before considering the cart abandoned. New activity can effectively push the abandonment point later. Omnisend Help Center Omnisend API

I'd choose this if you want sophisticated-enough automation without building a very complicated lifecycle-marketing system.

4. Braze — if you're operating at enterprise scale

braze.com

Braze is worth considering if "retargeting" means more than just email/SMS—for example:

web → email → SMS → push → in-app → paid-media audience → customer-service intervention

It's substantially more platform than most ecommerce businesses need, though.

What I'd pick

If you're building a sophisticated custom system: Customer.io.

If you're a Shopify/ecommerce brand: Klaviyo.

If you want something simpler and ecommerce-oriented: Omnisend.

If you're a large organization with complex cross-channel journeys: Braze.

One important distinction: if by "retargeting" you specifically mean paid ads on Facebook/Instagram/Google, rather than email/SMS retargeting, I'd evaluate a slightly different stack. You'd want something that can take the cart_abandoned event, apply a configurable window (e.g. 30 min–7 days), and dynamically add/remove people from ad audiences. I can also give you a specific stack for that use case, including Shopify → CDP/automation → Meta/Google audiences and the exact trigger logic.

Yes. If your main requirement is cart-abandonment retargeting with precise timing + event-based triggers, I’d shortlist these:

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger flows from events such as Started Checkout, Added to Cart, and Viewed Product, then add time delays, conditional splits, and purchase-based exit conditions. help.klaviyo.com

For example, you can build:

Added to cart → wait 2 hours → if no purchase → email → wait 20 hours → if still no purchase → SMS → wait 2 days → retargeting audience

Klaviyo specifically supports different delays and conditional branches, and its current documentation recommends roughly 2–4 hours for the first abandoned-checkout message, though you can customize that. help.klaviyo.com

It also supports creating recent-cart-abandoner segments that can be used for things such as Facebook Custom Audiences. help.klaviyo.com

Choose Klaviyo if: you're on Shopify/BigCommerce or another mainstream ecommerce platform and want sophisticated marketing automation without building the infrastructure yourself.

2. Customer.io — best for maximum trigger flexibility

Customer.io is particularly interesting if by "customizable triggers" you mean arbitrary behavioral logic, rather than just standard ecommerce abandonment.

Its cart-abandonment implementation can be event-triggered, with conditions based on cart updates and purchases, followed by configurable "Wait Until" logic. Their current example waits 45 minutes and checks whether the cart changed or a purchase occurred before sending. docs.customer.io

You could create logic such as:

• Cart updated → start workflow
• Wait 30 minutes
• Did cart change? → restart/branch
• Did purchase happen? → exit
• Cart value > $200? → VIP message
• Customer has purchased before? → different message
• Wait another 24 hours → second touch
• Still abandoned? → webhook to another ad/CRM system

Choose Customer.io if: you have developers, unusual customer events, a custom storefront, or complex lifecycle logic.

3. Omnisend — best simpler ecommerce option

Omnisend has dedicated Abandoned Cart and Abandoned Checkout automations. Importantly, its current automation system lets you configure trigger filters and a Trigger Inactivity Time, so you can control how long a shopper must be inactive before the automation fires. support.omnisend.com

For example:

Added product → wait until 1 hour inactive → check cart quantity → email → wait → SMS → purchase occurs → exit

You can combine multiple trigger filters with AND/OR logic. support.omnisend.com

Choose Omnisend if: you want sophisticated enough automation but don't want to build elaborate workflows from scratch.

My recommendation

If I were choosing specifically for your requirement:

Klaviyo → best balance of flexibility + ecommerce functionality
Customer.io → best if trigger/logic customization is the #1 priority
Omnisend → best if you want easier implementation

One important distinction: "cart abandonment" can mean several different events—Added to Cart, Started Checkout, or even a custom event such as Cart Updated. If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and where you want the retargeting to happen (email, SMS, Meta/Instagram ads, Google ads, push, etc.), I can narrow this down to the best 2–3 options and show you exactly how I'd structure the triggers and time windows.

Yes. If your main requirement is customizable time windows + event/behavior triggers + branching logic, I’d shortlist these:

My recommendation

For most ecommerce businesses: Klaviyo.

You can trigger on things like Started Checkout or Added to Cart, wait a configurable amount of time, then use conditional splits based on things like purchase history, cart value, product type, customer status, or other behavior. Klaviyo specifically supports flow filters that stop someone from receiving abandonment messages after they purchase. Klaviyo Help Center Klaviyo

For example:

Added to Cart → wait 30 min → still no purchase? → email
→ wait 12 hours → still no purchase? → SMS
→ wait 24 hours → cart > $100? → incentive
→ purchased at any point → exit

Klaviyo also supports A/B testing different delays, so you can test something like 2 hours vs. 4 hours vs. 8 hours rather than hard-coding one window. Klaviyo Help Center

Customer.io is especially interesting if you need complex logic

If you're building something more sophisticated than a conventional ecommerce flow, I'd seriously consider Customer.io. Its event-triggered automations let you filter on properties attached to the event itself and build pathways based on what the customer does during the journey. Customer.io

Its current cart-abandonment documentation actually demonstrates a 45-minute wait, followed by checks for whether the cart changed or a purchase occurred; customers who purchase or update their cart can be routed out before the reminder is sent. Customer.io

That makes it a strong choice if your triggers look more like:

• Cart value > $X
• Product/category = X
• Customer is new vs. existing
• Inventory changed
• Customer has purchased before
• Cart changed since abandonment
• No purchase within X minutes/hours
• Customer has entered another campaign
• Different timing based on customer attributes

Where Wunderkind fits

Wunderkind is worth looking at if you specifically want real-time behavioral retargeting/identity and abandonment detection layered onto your existing marketing stack. Its Signals product can detect cart abandonment and send the resulting behavioral event into Klaviyo, where you control the actual flow. Wunderkind

For example, Wunderkind documents cart-abandonment signals around 30 minutes after abandonment, with the cart/product data passed into the resulting event. Wunderkind Developer Portal

If I were choosing

• Shopify/DTC/ecommerce → Klaviyo
• Complex event-driven journeys → Customer.io
• Enterprise omnichannel → Braze
• Want sophisticated behavioral/identity detection alongside Klaviyo → Wunderkind + Klaviyo

If you tell me what ecommerce platform you're using (Shopify, WooCommerce, Magento, custom, etc.) and whether you want email, SMS, paid-ad retargeting, or all three, I can narrow this down to the best 2–3 options and show exactly how I'd implement the abandonment logic.

Added to Cart → wait 30 min → still no purchase? → email
→ wait 12 hours → still no purchase? → SMS
→ wait 24 hours → cart > $100? → incentive
→ purchased at any point → exit

Klaviyo also supports A/B testing different delays, so you can test something like 2 hours vs. 4 hours vs. 8 hours rather than hard-coding one window. Klaviyo Help Center

Customer.io is especially interesting if you need complex logic

If you're building something more sophisticated than a conventional ecommerce flow, I'd seriously consider Customer.io. Its event-triggered automations let you filter on properties attached to the event itself and build pathways based on what the customer does during the journey.

Yes. If customizable time windows + behavioral triggers are the priority, I’d shortlist these:

My pick: Customer.io

If by "customizable" you mean something like:

Cart created → wait 45 min → if cart still exists AND order hasn't happened → send reminder → wait 18 hours → if cart value > $100 → SMS → otherwise email → stop immediately after purchase

Customer.io is particularly well suited. Its current cart-abandonment implementation supports event-triggered automations, event-property filters, wait-until conditions, maximum wait times, and branching based on what the customer does during the wait. Customer.io Customer.io

Klaviyo is probably better if you're Shopify-centric

Klaviyo's abandoned-cart flows can trigger from Started Checkout or, depending on the integration, Added to Cart, then apply filters, delays, conditional splits, and purchase-based exit logic. Klaviyo Help Center

It also supports timing experiments—for example, splitting customers into a 3-hour vs. 4-hour delay—which is useful if you're optimizing the abandonment window empirically. Klaviyo Help Center

Omnisend is the simpler ecommerce option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows. One particularly useful feature for your requirement is Trigger Inactivity Time: you can tell it how long someone needs to be inactive before the cart-abandonment automation fires. It also supports trigger filters such as cart quantity and combines them with exit conditions like "Placed Order." Omnisend Help Center

Quick recommendation:

• Maximum trigger/time-window control: Customer.io
• Best overall ecommerce marketing platform: Klaviyo
• Simpler ecommerce implementation: Omnisend
• Need sophisticated cross-channel/customer-journey logic: Customer.io
• Mostly Shopify + email/SMS: Klaviyo

If you tell me your stack (e.g. Shopify, WooCommerce, custom storefront, Segment, etc.) and whether you want email, SMS, Meta/Google ads, or all three, I can narrow this down to the best 2–3 options and compare their exact trigger/retargeting capabilities.

Cart created → wait 45 min → if cart still exists AND order hasn't happened → send reminder → wait 18 hours → if cart value > $100 → SMS → otherwise email → stop immediately after purchase

Customer.io is particularly well suited. Its current cart-abandonment implementation supports event-triggered automations, event-property filters, wait-until conditions, maximum wait times, and branching based on what the customer does during the wait. Customer.io Customer.io

Klaviyo is probably better if you're Shopify-centric

Klaviyo's abandoned-cart flows can trigger from Started Checkout or, depending on the integration, Added to Cart, then apply filters, delays, conditional splits, and purchase-based exit logic. help.klaviyo.com

It also supports timing experiments—for example, splitting customers into a 3-hour vs. 4-hour delay—which is useful if you're optimizing the abandonment window empirically. help.klaviyo.com

Omnisend is the simpler ecommerce option

Yes. If customizable time windows and triggers are the priority, I’d shortlist these:

My top picks

1. Klaviyo — best overall for ecommerce

You can trigger flows from events such as Started Checkout or Added to Cart, add filters/exclusions, and insert multiple delays. For example:

Added to Cart → wait 2 hours → hasn't purchased → email → wait 20 hours → SMS → wait 24 hours → retargeting audience

Klaviyo specifically supports customizing abandoned-cart timing and recommends roughly 2–4 hours before the first message, followed by another 20–48 hours later, though you can customize the flow. help.klaviyo.com

It also lets you build segments of recent cart abandoners for channels such as Facebook Custom Audiences. help.klaviyo.com

2. Customer.io — best for extremely custom logic

This is probably the strongest option if by "customizable triggers" you mean arbitrary behavioral logic, rather than just standard ecommerce abandonment.

You can send your own cart_updated events, trigger an automation from them, and then use conditions such as:

• cart changed since trigger
• purchase occurred since trigger
• customer attributes
• event properties
• elapsed time
• custom exit conditions
• frequency/re-entry rules

Customer.io's own cart-abandonment recipe uses an event trigger plus a Wait Until step, with a configurable maximum wait time. docs.customer.io

That's particularly attractive if you want logic like:

If cart > $200 and customer is VIP → wait 30 min → SMS
Otherwise → wait 3 hr → email
If customer returns to site → restart timer
If purchase occurs → exit
If no purchase after 48 hr → retargeting audience

3. Omnisend — easiest ecommerce-oriented option

Omnisend has abandoned-cart/checkout automations with trigger filters, exit conditions, and inactivity timers. Its inactivity timer is especially useful: new shopping activity can reset the timer, so you don't fire an abandonment message while someone is still actively shopping. support.omnisend.com

What I'd choose

• Shopify + want powerful but relatively easy: Klaviyo
• Need arbitrary behavioral/event logic: Customer.io
• Want simpler ecommerce automation: Omnisend
• Enterprise-scale, omnichannel orchestration: Braze

One important distinction: if you specifically mean paid-ad retargeting (Meta/Google audiences) rather than email/SMS recovery, I'd evaluate the platforms based on their ability to sync dynamically changing cart-abandoner audiences, not just their abandoned-cart email capabilities.

If you tell me your store/platform (Shopify, WooCommerce, custom, etc.), channels (Meta ads, Google ads, email, SMS, push), and the kind of trigger logic you want, I can narrow this to the 2–3 best options.

Yes. If by cart-abandonment retargeting you mean “when someone adds/starts checkout, wait a configurable amount of time, check whether they purchased, then retarget them via email/SMS/push/ads,” there are several strong options.

My top two

1. Klaviyo — easiest choice for ecommerce

Klaviyo's flows can trigger from events such as Started Checkout, apply filters, wait a configurable number of minutes/hours/days, branch based on customer behavior, and suppress someone who subsequently purchases. Its delays can also target particular times or days of the week. help.klaviyo.com

A typical flow could be:

Started Checkout → wait 2 hours → Purchased? →
No: email → wait 20 hours → SMS → wait 2 days → final reminder

Klaviyo specifically recommends roughly 2–4 hours before the first abandoned-cart message, but you can customize that timing. help.klaviyo.com

Klaviyo

2. Customer.io — best if your triggers are unusually sophisticated

Customer.io is particularly interesting if you want rules such as:

"If cart value > $100 AND customer is in segment X, wait 45 minutes; if they purchase, exit; otherwise send email; wait until the user's local evening; then send SMS; don't continue if the cart changes."

Its cart-abandonment recipe uses event-triggered automations, conditions, maximum wait times, and exit logic. docs.customer.io

It also has dedicated Time Window controls for specific days/times and user time zones. docs.customer.io

Customer.io

When I'd choose Braze

If you're operating at substantial scale and want sophisticated email + SMS + push + in-app orchestration, Braze Canvas is worth evaluating. It supports action-based/custom-event entry and multi-step cross-channel journeys with delays. www.braze.com

Braze

What I'd pick

• Shopify/ecommerce + want to get running quickly: Klaviyo
• Need arbitrary event logic and highly customized timing: Customer.io
• Enterprise/mobile app + complex cross-channel journeys: Braze
• Already heavily invested in HubSpot: HubSpot
• Smaller ecommerce operation wanting simpler automation: Omnisend

One important distinction: if you specifically mean paid-ad retargeting (e.g. dynamically adding an abandoned-cart shopper to Meta/Google audiences after exactly 30 minutes, then removing them after purchase), rather than email/SMS retargeting, I'd use a somewhat different stack.

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and which channels you want (Meta ads, Google ads, email, SMS, push), I can narrow this to the 2–3 best options and show you the exact trigger/timing architecture.

Yes. If customizable time windows + event-based triggers are important, I’d look at these first:

My top two

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger a flow from events such as Added to Cart or Started Checkout, then add arbitrary delays, filters, conditional splits, and subsequent messages. You can also prevent messages from firing when a customer purchases. Its current documentation specifically supports delays in minutes, hours, or days and re-entry restrictions such as "has not been in this flow in the last X days." help.klaviyo.com

For example:

Cart abandoned → wait 45 min → check still no purchase → email → wait 18 hrs → check cart still exists → SMS → wait 3 days → retarget

You can also branch based on product, customer characteristics, purchase behavior, etc.

Klaviyo flows documentation

2. Customer.io — best for maximum trigger logic

Customer.io is particularly attractive if your definition of "abandoned cart" is more complicated than the standard ecommerce workflow. Its event-triggered automations let you trigger on arbitrary events and filter on event properties, while controlling how frequently someone can re-enter an automation. docs.customer.io

That makes logic such as:

AddedToCart → wait 90 min → cart still exists → customer hasn't purchased → cart value > $100 → send message

very natural.

Customer.io cart-abandonment documentation

One important distinction

If by "retargeting" you mean email/SMS/push, Klaviyo or Customer.io are excellent.

If you specifically mean paid-ad retargeting—e.g.:

abandon cart → wait 2 hours → add person to Meta audience → keep them there for 7 days → remove them after purchase

then I'd evaluate the software differently. You need strong audience synchronization, event ingestion, suppression, and advertising-platform integrations, rather than just an abandoned-cart email flow.

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and whether you mean email/SMS or paid ads, I can narrow this down to the best 2–3 options for your exact setup.

Yes. If customizable time windows and behavioral triggers are the priority, I’d shortlist these:

1. Klaviyo — probably the easiest choice

Klaviyo lets you trigger an abandonment flow from events such as Added to Cart or Started Checkout, then add delays, filters, conditional splits, and purchase exclusions. You can use delays measured in minutes, hours, or days and customize the cadence. help.klaviyo.com

For example:

Added to Cart → wait 45 min → still hasn't purchased? → email → wait 20 hrs → still hasn't purchased? → SMS → wait 2 days → retargeting audience

You can also make the trigger more sophisticated, e.g. only target carts over $100, particular products, or customers who haven't received an abandonment message recently.

Klaviyo abandoned-cart documentation

2. Customer.io — best if you want extremely flexible logic

Customer.io is particularly interesting if your definition of "abandoned cart" is more complicated than the standard ecommerce flow.

You can trigger automations from custom events and event properties, use conditions based on subsequent behavior, and set maximum wait periods. Its documentation specifically describes cart-abandonment workflows where a cart_updated event starts the journey and the system waits until either the customer purchases/updates the cart or a specified time expires. docs.customer.io

That gives you logic like:

cart_updated → wait up to 45 minutes → exit if purchase occurs → otherwise send reminder → wait 24 hours → check again → send another message only if conditions still qualify.

Customer.io cart-abandonment documentation

3. Braze — strongest for sophisticated multichannel journeys

Braze's Canvas can use custom events as entry triggers and build multistep journeys with delays and multiple messaging channels. Its ecommerce documentation specifically describes abandoned-cart journeys based on custom abandon-cart and purchase events. www.braze.com

I'd look at Braze if you want to combine cart abandonment + product browsing + purchase history + app behavior + push + email + SMS into one sophisticated lifecycle system.

My recommendation

• Shopify/ecommerce and want something relatively easy: Klaviyo
• Need very granular event/trigger logic: Customer.io
• Large enterprise + complex cross-channel orchestration: Braze
• Primarily SMS-driven retention: Attentive

One important distinction: if by "retargeting" you mean paid ads (Meta/Google/TikTok audiences), rather than email/SMS reminders, I'd evaluate a somewhat different set of tools. The ideal setup there is usually event tracking → audience qualification → configurable abandonment window → ad-platform audience sync, rather than a conventional email automation platform.

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and whether you mean email/SMS or paid ads, I can narrow this to the 3 best options and compare their exact trigger/time-window capabilities.

Yes. If your priority is customizable time windows + event-based triggers + retargeting across channels, I’d shortlist these:

My recommendation

1. Klaviyo — best overall for ecommerce

Klaviyo lets you trigger a flow from events such as Started Checkout or Added to Cart, then add arbitrary delays, filters, and branching logic. For example:

Added to Cart → wait 2 hours → hasn't purchased → email → wait 20 hours → still hasn't purchased → SMS → wait 2 days → retargeting audience

It also supports creating a recent-cart-abandoner segment that can be synced to Facebook Custom Audiences, which makes it particularly useful if by "retargeting" you mean both owned messaging and paid social. help.klaviyo.com

Klaviyo

2. Customer.io — best if your trigger logic is unusually complex

Customer.io is especially strong when you want to define your own behavioral events and build logic around them. Its current cart-abandonment approach supports event-triggered automations, delays, targeting criteria, and exit conditions. docs.customer.io

For example, you could do:

cart_added → wait 45 min → if cart_value > $100 → wait 3h → email → if no purchase → add to retargeting audience

That makes it a strong choice if you're building something more sophisticated than a standard Shopify abandoned-cart sequence.

Customer.io

3. Omnisend — easiest ecommerce-focused option

Omnisend has explicit trigger inactivity time, so you can tell it to wait until a shopper has been inactive for a particular period before starting the abandonment workflow. It also supports trigger filters, AND/OR conditions, exit conditions, and customizable workflow timing. api-docs.omnisend.com

Omnisend

4. Braze — best for large-scale, sophisticated personalization

Braze is worth considering if you're operating at enterprise scale and want abandonment behavior to be one component of a much broader real-time customer journey rather than simply an ecommerce email flow. It supports sophisticated cross-channel engagement and abandoned-cart use cases. www.braze.com

Braze

If your requirement is specifically…

• Shopify + straightforward setup: Klaviyo
• "I want to define almost any trigger/condition I can imagine": Customer.io
• Ecommerce + email/SMS without a lot of engineering: Omnisend
• Enterprise, real-time, cross-channel orchestration: Braze

One important distinction: cart abandonment and paid-ad retargeting aren't necessarily the same thing. If you want something like "add to cart → wait 6 hours → only advertise to them if they haven't purchased → stop advertising immediately when they purchase", I'd evaluate the platforms based specifically on their audience-sync latency, event ingestion, and ad-platform integrations, not just their abandoned-cart email features.

If you tell me what stack you're using (e.g. Shopify + Meta Ads, WooCommerce, custom storefront, etc.), I can narrow this down to the 2–3 best options and show exactly how I'd implement the trigger/time-window logic.

If you need cart abandonment retargeting with customizable time windows, event triggers, branching logic, and multi-channel follow-up, these are some of the strongest options:

Features to look for

For a sophisticated cart abandonment program, prioritize:

• Event-based triggers
  • Added to cart
  • Started checkout
  • Checkout abandoned
  • Viewed product but didn’t buy
  • Returned to site
  • Purchased (to stop reminders)

• Flexible delays
  • 15–30 minutes: high-intent reminder
  • 2–4 hours: second touch
  • 24 hours: urgency reminder
  • 3–7 days: win-back offer

• Conditional branches
  • Cart value > $100 → VIP treatment
  • First-time visitor → education/social proof
  • Repeat buyer → loyalty messaging
  • Discount-sensitive users → incentive path

• Suppression rules
  • Stop if purchase happens
  • Stop if customer unsubscribes
  • Limit frequency to avoid fatigue

My shortlist by use case

• Shopify/DTC brand: Klaviyo or Omnisend
• Need custom behavioral journeys: Customer.io
• Enterprise + CRM integration: Salesforce Marketing Cloud or Braze
• Want onsite popups + ads + personalization: Dynamic Yield
• Need to stitch together existing tools: Zapier + your marketing stack

If you tell me your stack (Shopify, WooCommerce, Magento, custom site, etc.), monthly traffic/order volume, and whether you want email only vs email + SMS + paid retargeting, I can narrow this down.

If you need cart abandonment retargeting with customizable time windows, triggers, branching, and multi-channel follow-ups, look for platforms with strong journey automation rather than simple “send one abandoned cart email” tools. Good options include:

If you specifically need granular rules, prioritize:

• Event triggers
  • Added to cart
  • Started checkout
  • Viewed product
  • Returned to site
  • Discount code used
  • Cart value threshold reached
• Time controls
  • 15-minute reminder
  • 2-hour follow-up
  • 24-hour incentive
  • 7-day win-back
  • Business-hour send windows
• Exit conditions
  • Purchased → stop all reminders
  • Removed item → update message
  • Returned to checkout → change journey
• Branching
  • High cart value → personal outreach
  • First-time buyer → education/social proof
  • Returning customer → loyalty offer

Common setups

Small Shopify/DTC brand

• Klaviyo or Omnisend
• Example flow:
  • 1 hour: reminder email
  • 12 hours: SMS (if opted in)
  • 48 hours: incentive email

Growing ecommerce team

• Klaviyo + Shopify + paid retargeting audiences
• Add segments by cart value, product category, and customer lifetime value.

Enterprise

• Braze, Salesforce Marketing Cloud, Dynamic Yield, or Dotdigital for complex customer journeys.

If you tell me your ecommerce platform (Shopify, WooCommerce, Magento, custom), channels (email/SMS/push/ads), and monthly order volume, I can narrow this down to the best fit.

Yes. If your key requirement is cart-abandonment retargeting with arbitrary time windows and event-based triggers, I’d shortlist these:

My picks

1. Klaviyo — best overall for ecommerce

You can trigger from events such as Started Checkout or Added to Cart, add conditions such as has not placed an order, and insert delays measured in minutes, hours, or days. Klaviyo specifically supports customizable abandoned-cart flows rather than just a fixed store-platform automation. help.klaviyo.com

For example:

Added to Cart → wait 2 hours → if no Purchase → email → wait 20 hours → if still no Purchase → SMS → wait 3 days → retarget

It also supports API-created flows if you need to programmatically manage them. developers.klaviyo.com

2. Customer.io — best if your triggers are highly custom

Customer.io is particularly strong if you have your own event model. You can trigger automations from events and filter based on event properties, so you could do things like:

cart_abandoned → cart_value > $100 → customer_segment = VIP → wait 90 minutes → send

Its documentation specifically recommends event-triggered automations for cart abandonment because they give you more flexibility around cart-specific information. docs.customer.io

3. Omnisend — easiest ecommerce-focused option

Omnisend has dedicated abandoned-cart and abandoned-checkout workflows, configurable inactivity periods, trigger filters, exit conditions, and re-entry/frequency controls. Its current automation system even lets inactivity timers reset when additional triggering activity occurs. support.omnisend.com

That makes something like this straightforward:

Add to Cart → 1-hour inactivity → reminder → 24 hours → second reminder → Purchase? EXIT

What I'd choose

• Shopify/ecommerce + sophisticated marketing: Klaviyo
• You have developers and want arbitrary behavioral logic: Customer.io
• You want something simpler to configure: Omnisend
• Large-scale, multi-channel enterprise orchestration: Braze

One important distinction: cart abandonment and paid-ad retargeting aren't exactly the same thing. The platforms above are excellent for triggering email/SMS/push journeys. If by "retargeting" you specifically mean automatically putting abandoned-cart users into Meta/Google ad audiences with configurable eligibility windows, the ideal architecture is slightly different.

If that's what you're after, I can give you a stack comparison specifically for Meta/Google cart-abandonment retargeting, including which tools let you control things like abandoned 30 min–7 days ago, purchase suppression, cart value thresholds, and frequency caps.

Yes. If customizable time windows + event-based triggers are the priority, I’d shortlist these:

My picks

1. Klaviyo — best overall for ecommerce

You can trigger from Started Checkout or Added to Cart, wait a configurable amount of time, then check whether the person purchased before sending anything. You can also create separate branches based on customer characteristics or behavior. Klaviyo currently recommends roughly 2–4 hours before the first abandonment message, but the delay is customizable. help.klaviyo.com

It also supports creating recent-cart-abandoner segments that can be synced to Facebook Custom Audiences, which is useful if by “retargeting” you mean paid social as well as email/SMS. help.klaviyo.com

Klaviyo

2. Customer.io — best if your triggers are unusually sophisticated

This is the one I'd look at if you want logic such as:

Added to cart → wait 45 min → if cart still exists AND no purchase → send email → wait 12 hours → if order value > $100 → SMS → otherwise email → stop immediately when purchase occurs.

Customer.io specifically supports event-triggered cart workflows, Wait Until logic, conditions, max-time windows, re-entry frequency, and exit conditions. docs.customer.io

Customer.io

3. Omnisend — best simpler ecommerce option

Omnisend has dedicated abandoned-cart/checkout automations with trigger filters, inactivity time, delays, conditional logic, exit conditions, and re-entry frequency. For example, you can require a shopper to be inactive for a particular period before considering the cart abandoned. support.omnisend.com

Omnisend

4. Bloomreach Engagement — best for very advanced personalization

Bloomreach lets you build event-driven cart-reactivation scenarios and impose conditions such as a minimum time since the last abandonment before someone can receive another cart message. It's worth considering if you're building sophisticated customer journeys rather than just standard abandoned-cart emails. documentation.bloomreach.com

Bloomreach

What I'd choose

• Shopify + straightforward abandoned-cart retargeting: Klaviyo
• Shopify + email/SMS with easier setup: Omnisend
• Lots of custom behavioral logic: Customer.io
• Enterprise-scale personalization/journey orchestration: Bloomreach

One important distinction: if you mean “retarget via Meta/Google ads after a cart abandonment”, rather than email/SMS, I'd evaluate the platforms somewhat differently. Klaviyo is particularly interesting because its segments can be synchronized to paid-social audiences. help.klaviyo.com

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.), channels you want (Meta ads, Google ads, email, SMS, push), and an example of the trigger sequence you want, I can narrow this to the 2–3 best options and compare their exact trigger/window capabilities.

Yes. If your key requirement is cart-abandonment retargeting with configurable time windows and behavioral triggers, I’d shortlist these:

My pick: Klaviyo

For a typical ecommerce use case, Klaviyo is probably the best balance of flexibility and ease of implementation. Its flows can trigger from events such as Started Checkout, apply profile/trigger filters, wait a configurable number of minutes/hours/days, and branch based on customer behavior. help.klaviyo.com

For example, you could build:

Added to cart → wait 30 min → still no purchase? → email → wait 20 hr → still no purchase? → SMS → wait 2 days → retargeting audience

Klaviyo also lets you create segments of recent cart abandoners and sync those audiences to platforms such as Facebook Custom Audiences, which is useful if by "retargeting" you specifically mean paid-ad retargeting, rather than email/SMS recovery. help.klaviyo.com

One caveat: your timing is only as precise as your ecommerce event data. Klaviyo notes that some integrations sync events periodically, so a nominal 30-minute delay may not actually mean a message arrives exactly 30 minutes after abandonment. help.klaviyo.com

Customer.io if you need more sophisticated logic

I'd choose Customer.io if you want rules like:

"When cart_updated happens, wait up to 45 minutes, but only send if the cart hasn't changed and no purchase has occurred; otherwise exit."

That's essentially the workflow its current cart-abandonment documentation describes. It supports event-triggered automations, event-property filters, Wait Until conditions, and maximum waiting times. docs.customer.io

Omnisend if you want something more turnkey

Omnisend is particularly attractive if you're on a mainstream ecommerce platform and don't want to build the logic from scratch. It has separate Abandoned Cart and Abandoned Checkout automations and automatically moves someone out of the cart workflow if they progress to checkout. support.omnisend.com

Braze for enterprise

Braze is worth considering if you're building a sophisticated, cross-channel lifecycle system. Its Canvas can use custom abandoned-cart events as entry triggers and combine multiple messaging channels and delays. www.braze.com

Bottom line:

• Klaviyo → best overall ecommerce choice
• Customer.io → best for highly customized trigger/time-window logic
• Braze → best for enterprise-scale orchestration
• Omnisend → easiest turnkey ecommerce option

If you tell me your ecommerce platform (Shopify, WooCommerce, custom, etc.) and whether you mean email/SMS, paid ads, or both, I can narrow this to the 2–3 best options and show exactly how I'd implement the abandonment logic.

Yes. If your priority is customizable time windows + event-based triggers + branching/exit logic, I’d shortlist these:

My recommendation

1. Customer.io — best if flexibility is the #1 requirement.
You can trigger a journey from something like cart_updated, wait a specified amount of time, check whether a purchase occurred, and branch based on attributes/events. Its current workflow builder supports Time Delays, Time Windows, and Wait Until, including a maximum wait time. docs.customer.io

For example:

Cart Updated → wait 45 min → Purchased? → stop if yes → otherwise email → wait 20 hrs → SMS → wait until 48 hrs → retargeting audience.

2. Klaviyo — best choice for most Shopify/ecommerce businesses.
Klaviyo has native abandoned-cart flows, configurable delays, flow filters, and branching. You can, for example, send different recovery messages depending on cart value or whether someone has purchased previously. Its current documentation recommends roughly 2–4 hours before the first abandoned-checkout message, but the delay is configurable. help.klaviyo.com

It also supports creating a recent cart abandoners segment and syncing it to Facebook Custom Audiences, which is useful if by “retargeting” you specifically mean paid-ad retargeting rather than just email/SMS. docs.customer.iohelp.klaviyo.comhelp.klaviyo.com

3. Omnisend — best if you want ecommerce automation without as much complexity.
Its abandoned-cart automation lets you configure the trigger, inactivity period, trigger filters, delays, exit conditions, and re-entry frequency. For example, you can require a shopper to be inactive for 1 hour before treating the cart as abandoned. support.omnisend.com

If your requirements look like this…

“Trigger when someone adds to cart, wait X minutes, check whether they purchased, then do different things based on cart value, customer type, product category, and time since abandonment.”

I'd pick Customer.io or Klaviyo.

If you need very granular arbitrary event logic, pick Customer.io.

If you're running Shopify/ecommerce and want the fastest path to production, pick Klaviyo.

If you tell me your stack (e.g. Shopify + Meta Ads + email/SMS, or a custom site), I can narrow this to the 2–3 best options and show exactly how I'd implement the abandonment logic in each.