ChatGPT answers, unedited

If unified cart experience is the key requirement—i.e. a customer can put a subscription item and a one-time item in the same cart and check out once—I’d shortlist these:

🥇 Shopify + PayWhirl

This would be my first choice if you're primarily selling physical products.

PayWhirl specifically supports mixed carts, allowing a customer to purchase a one-time item alongside a recurring subscription in a single checkout. www.shopify.com Shopify also gives you the underlying cart, checkout, payments, orders, and customer account infrastructure, so you aren't stitching together two separate checkout experiences.

Shopify
PayWhirl

Why I'd choose it: relatively turnkey, native-feeling Shopify experience, and mixed-cart support is explicitly documented.

🥈 Shopify + Recharge

If subscriptions are a major part of the business rather than just an add-on, I'd look hard at Recharge. It has a more subscription-specialized feature set and is designed for brands scaling recurring revenue. Shopify's current subscription-app roundup lists Recharge among its leading options. www.shopify.com

Recharge

The tradeoff is that you're introducing a more substantial subscription platform rather than keeping everything as lightweight as possible.

🥉 Shopify + Appstle

Worth considering if you want lots of subscription functionality without immediately moving to a more heavyweight platform. Appstle currently has a 5.0 rating with 8,000+ Shopify App Store reviews and supports subscriptions, subscription boxes, and bundles. apps.shopify.com

Appstle

BigCommerce

BigCommerce is attractive if you have a complicated catalog, B2B requirements, or want more freedom around payment/subscription providers. Its recurring-payment ecosystem is intentionally provider-agnostic, with integrations for subscription and recurring billing services. www.bigcommerce.com

BigCommerce

The downside is that the single unified mixed-cart experience depends more heavily on the particular subscription/payment integration than it does in the Shopify ecosystem.

What I'd avoid

I wouldn't start with Stripe Billing/Subscriptions alone if your goal is a polished physical-product ecommerce experience. Stripe is excellent as a billing/payment infrastructure layer, but you'd generally be responsible for substantially more of the storefront/cart/order orchestration yourself.

My ranking for your specific requirement:

1. Shopify + PayWhirl — best if mixed cart + simplicity is #1
2. Shopify + Recharge — best for a serious subscription-first brand
3. Shopify + Appstle — best value/flexibility
4. BigCommerce + subscription integration — best for complex/B2B commerce
5. Stripe custom — best only if you have engineering resources and need a highly bespoke experience

One important distinction: “supports one-time purchases” isn't necessarily the same as “supports one-time + subscription line items in the same cart and one checkout.” Shopify's app marketplace currently has 100+ subscription apps that advertise one-time-payment functionality, so I'd specifically test the mixed-cart checkout behavior before selecting one. apps.shopify.com

If you tell me whether you're selling physical products, digital products, SaaS, memberships, or a mix, I can narrow this down to the 2–3 architectures I'd actually consider.

If one-time purchases + subscriptions in the same cart/checkout is the key requirement, I’d shortlist these:

🥇 My pick: Shopify + PayWhirl

If your requirement is literally:

Customer adds a $50 one-time product + a $20/month subscription → one cart → one checkout → one seamless purchase

PayWhirl is particularly compelling. Its current Shopify integration explicitly supports combining recurring and one-time products in the same Shopify checkout, while retaining Shopify's normal checkout flow. shop.paywhirl.com

It also gives you more flexibility than basic Shopify Subscriptions—custom billing intervals, prepaid subscriptions, subscription portals, skips, swaps, etc. shop.paywhirl.comwww.shopify.comdemo.appstle.com

PayWhirl

🥈 If you're already on Shopify: start native

Shopify Subscriptions is probably the lowest-complexity choice. Shopify specifically describes its native setup as providing a unified checkout, and its current guidance says mixed carts can contain both a one-time product and a subscription in a single transaction. www.shopify.com

Shopify Subscriptions

The tradeoff is that you get less sophisticated subscription logic than dedicated platforms.

🥉 Appstle if subscriptions are a major part of the business

Appstle is worth considering if you need things like subscription bundles, more sophisticated subscription management, and the ability for subscribers to add one-time products to an upcoming recurring order. Its documentation explicitly supports mixed carts. demo.appstle.com

Appstle

Recharge for a serious subscription operation

I'd look at Recharge when subscriptions are already a substantial percentage of revenue and you care about retention/operational tooling more than minimizing your stack. Shopify currently characterizes Recharge as a high-volume/advanced subscription option. www.shopify.com

Recharge

What I'd choose by situation

• Starting a normal DTC store: Shopify + Shopify Subscriptions
• Need mixed carts + lots of subscription flexibility: Shopify + PayWhirl
• Subscriptions are core to the business: Appstle or Recharge
• Already on BigCommerce: BigCommerce + PayWhirl; its native selling-plan integration supports mixed carts. docs.paywhirl.com
• Headless/custom SaaS: Stripe, with a custom cart/checkout implementation

One important distinction: don't just ask whether a platform supports "one-time + subscriptions." Ask whether it supports mixed recurring/non-recurring line items in the same cart and checkout, without redirecting the subscriber to a separate checkout. That's the feature that determines whether the experience actually feels unified.

If you tell me your stack (Shopify, WooCommerce, BigCommerce, custom/headless, etc.), product type, and whether the subscription is physical or digital, I can narrow this to the 2–3 best options and compare pricing, fees, checkout behavior, and API flexibility.

If your key requirement is “a customer can put subscription items and one-time items into the same cart and check out once”, I’d shortlist these:

My recommendation: Recharge

Recharge explicitly supports a unified checkout where subscription and one-time purchases can be made in a single transaction. It also gives you substantially more subscription merchandising/retention functionality than native Shopify Subscriptions. Shopify

So the ideal experience can be:

Product A — One-time — $40
Product B — Subscribe & save — $25/month
Product C — One-time — $15
Checkout — $80 today

rather than forcing the customer through separate carts or checkouts.

rechargepayments.com

When I'd choose the others

Shopify Subscriptions — choose this if you want the simplest possible stack. It integrates directly into Shopify admin/Shopify Payments, and Shopify specifically positions it as providing a unified checkout experience. Shopify

shopify.com

Appstle — compelling if you need more complex subscription configurations, bundles, build-a-box, memberships, etc., without moving to a more expensive enterprise-oriented setup. Shopify currently lists it as a 5.0-rated Built for Shopify app with a free plan. Shopify App Store

appstle.com

Skio — historically a strong choice for sophisticated DTC subscription UX, but there's an important 2026 wrinkle: Skio joined Recharge in June 2026. Skio So I wouldn't evaluate it as an entirely independent vendor anymore.

Bottom line

If unified cart + one-time purchases + sophisticated subscription management is the core requirement:

1. Recharge — best overall
2. Shopify Subscriptions — best for simplicity
3. Appstle — best value/flexibility

If you tell me what you're selling (physical products, digital, SaaS, memberships, etc.), your ecommerce platform, and roughly how many orders/subscribers you have, I can narrow this to the best 1–2 options and compare checkout architecture, pricing, fees, bundles, discounts, and subscription management.

If your key requirement is one checkout/cart where customers can buy both recurring subscriptions and one-time products, I’d shortlist these:

My pick: Skio

For your specific requirement, Skio is probably the strongest choice if you're on Shopify.

Skio explicitly supports adding both a subscription product and a one-time product to the cart, with the selling plan attached to the subscription item. Its documentation also covers one-time upsells and mixed carts. help.skio.comhelp.skio.comhelp.skio.com

The important distinction is that Skio isn't merely capable of "subscriptions + one-time purchases." It treats the two as parts of the same commerce experience, including subscription management, one-time additions, and order management. help.skio.com

One caveat: mixed-cart shipping on Shopify can still be somewhat awkward. Skio's current documentation says Shopify calculates the one-time and recurring shipping components separately, so you may see separate shipping lines rather than one perfectly unified shipping charge. help.skio.com

If you want the simplest/cheapest route

Shopify + Appstle is worth serious consideration. Shopify's current app marketplace has a large selection of subscription apps supporting one-time payments; Appstle is currently listed as Built for Shopify with thousands of reviews. apps.shopify.com

I'd choose it over Skio if subscription UX isn't a major competitive differentiator and you primarily want "normal Shopify checkout, but some products can subscribe."

How I'd decide

• Subscription-first DTC brand: Skio
• General ecommerce with subscriptions as an add-on: Shopify + Appstle
• Large/established subscription operation: Recharge
• Budget-conscious Shopify store: Seal/Appstle
• Need a completely custom/headless checkout: I'd look beyond Shopify apps and evaluate a composable stack.

If you tell me what you're selling (physical goods, digital, SaaS, memberships, etc.), your platform today, and approximate monthly orders, I can narrow this to the 2–3 best options and compare fees, cart behavior, checkout, taxes, shipping, failed payments, and subscription management.

If your key requirement is one checkout/cart that can contain both recurring subscriptions and one-time purchases, I’d shortlist these:

1. Paddle — my top pick

Paddle is unusually well suited to this exact model. Its catalog supports subscriptions, recurring add-ons, and one-time products, and its checkout supports multi-product purchases. It can also put one-time charges alongside subscription items. developer.paddle.com

For example, a customer could theoretically purchase:

• Pro subscription — $29/month
• Lifetime template pack — $49 once
• Setup service — $99 once

…in the same purchase flow.

The other major advantage is that Paddle is a merchant of record, handling payments, sales tax/VAT, fraud, and compliance for digital products. developer.paddle.com

Paddle

I'd choose Paddle if: you're selling SaaS, software, digital content, courses, licenses, or other digital products internationally.

2. Shopify + subscription app

For physical commerce, Shopify is probably the better answer. Its ecosystem has subscription apps specifically supporting one-time payments alongside subscriptions; the Shopify App Store currently lists dozens of them. apps.shopify.com

This gives you the traditional e-commerce experience:

Product A — Buy once
Product B — Subscribe & save
Product C — Buy once
→ One cart → one checkout

Apps such as Appstle, Seal, and others are worth evaluating depending on how much subscription logic you need.

Shopify

I'd choose Shopify if: you're selling physical goods and want a mature storefront/cart/inventory/shipping ecosystem.

3. Stripe

Stripe is arguably the strongest building block, particularly if you're building your own product rather than using a hosted commerce platform.

You get enormous flexibility around recurring prices, one-time prices, invoices, payment methods, customer accounts, etc. The tradeoff is that you'll need to build more of the unified cart/checkout experience yourself than with Paddle or Shopify.

Stripe

I'd choose Stripe if: you have an engineering team and want maximum control over the checkout and billing architecture.

4. Chargebee

Chargebee is excellent for sophisticated subscription management, but I'd rank it below Paddle for your particular requirement. Its hosted checkout supports one-time payments, but its documentation distinguishes that flow from subscription checkout, and one-time checkout has some limitations around plans/add-ons. www.chargebee.com

Chargebee

I'd choose Chargebee if: subscription lifecycle complexity—entitlements, multiple subscriptions, invoicing, B2B billing—is more important than having the cleanest consumer-style mixed cart.

My recommendation

For digital/SaaS: Paddle
For physical e-commerce: Shopify + a good subscription app
For a custom-built product: Stripe
For sophisticated B2B subscription billing: Chargebee

The important distinction is that “supports one-time charges” isn't necessarily the same as “supports a true mixed cart.” If your requirement is specifically one cart containing N recurring items + N one-time items → one checkout/payment, I'd put Paddle and Shopify at the top of the evaluation list.

If you tell me what you're selling (SaaS, physical goods, digital goods, memberships, etc.) and your stack (Shopify, WooCommerce, custom React/Next.js, etc.), I can narrow this to the best 2–3 options and compare fees, APIs, checkout UX, taxes, coupons, upgrades/downgrades, and mixed-cart behavior.

If unified cart = a customer can put a subscription item + one-time items into one cart and pay once, I’d shortlist these:

🥇 My default pick: Recharge + Shopify

Recharge is probably the safest choice if you're selling physical products through Shopify. Recharge explicitly supports one-time + subscription products in the same cart and checkout, and integrates with Shopify Checkout and Shop Pay. Its cart can also upsell a one-time buyer into a subscription. getrecharge.com

Recharge

The big advantage is that you aren't creating two purchasing experiences:

Product A — $40 one-time
Product B — $20/month subscription
Total today: $60 → one checkout

For an established Shopify brand, I'd choose Recharge over trying to bolt Stripe Billing directly onto Shopify.

🥈 Best if you're not committed to Shopify: Swell

Swell is particularly interesting if the requirement is subscriptions as a native part of commerce, rather than a subscription app attached to an ecommerce platform.

Swell has native subscriptions, mixed carts, APIs, custom storefronts, pause/resume, dunning, and separate billing/fulfillment schedules. The subscription and one-time products live in the same commerce system. www.swell.is

Swell

I'd strongly consider Swell for a headless Next.js/custom storefront, especially if subscriptions are central to the business rather than an add-on.

🥉 Best simpler/cheaper option: PayWhirl

PayWhirl explicitly supports mixed carts, including subscription and one-time products together. It also has subscription management, payment recovery, customer portals, and custom billing intervals. shop.paywhirl.com

PayWhirl

I'd look at PayWhirl if cost and straightforward implementation matter more than having the deepest enterprise subscription ecosystem.

What I wouldn't pick for this specific requirement

Stripe Billing alone is excellent for recurring billing and SaaS, but it's not really an ecommerce platform. You'd be responsible for building much more of the catalog/cart/checkout experience yourself. Stripe can attach one-time items to subscriptions, but that's different from having a polished ecommerce mixed cart experience. support.stripe.com

Stripe Billing

Shopify Subscriptions is attractive if you just need basic subscribe-and-save functionality. Shopify itself describes it as the straightforward native option, but more sophisticated subscription businesses tend to move to apps such as Recharge, Appstle, etc. www.shopify.com

My recommendation by scenario

• Shopify + physical products: Recharge
• Shopify + want lower cost/simple: PayWhirl or Appstle
• Headless/custom ecommerce: Swell
• SaaS/software rather than physical ecommerce: Stripe Billing
• Enterprise Shopify Plus + complex subscription program: Recharge
• You want subscriptions and one-time purchases to be genuinely one commerce model: Swell

The important distinction is "supports mixed carts" vs. "actually provides a good mixed-cart UX." I'd test the complete flow—add one-time → add subscription → change quantity → apply discount → checkout → fulfillment → subsequent renewal—before choosing. Shopify specifically recommends checking how well each platform handles mixed subscription/one-time carts rather than assuming support means a good UX. www.shopify.com

If you tell me what you're selling (physical/digital/SaaS), your current platform (Shopify/BigCommerce/custom), and roughly your monthly GMV, I can narrow this to the 2–3 best choices and compare pricing + cart behavior + checkout + subscription management + APIs.

If your key requirement is “customers can put subscription items and one-time items in the same cart and check out once”, I’d shortlist these:

1. Recharge — my default recommendation

Recharge is probably the closest match to your requirement. Its current Shopify offering explicitly supports “unified checkout” for single-product and subscription purchases in one transaction, alongside a customer portal, bundles, upsells, and subscription analytics. www.shopify.comhelp.skio.com

So a customer could have:

Coffee subscription — $25/month
Mug — $30 one-time
Sample pack — $15 one-time
Checkout: $70 today

…and only the coffee renews subsequently.

Why I'd pick it: mature subscription infrastructure without forcing you to build the recurring-order logic yourself.

2. Shopify Subscriptions — best if you want to minimize software

If you're already on Shopify, the native Shopify Subscriptions app is surprisingly capable. Shopify explicitly supports products being offered both as subscriptions and one-time purchases, and subscription information appears in the cart and checkout. help.shopify.com

Shopify also documents mixed orders containing subscription + one-time products. help.shopify.com

The downside is that the native product is less sophisticated around things like subscription merchandising, retention flows, advanced upsells, and subscription-specific UX.

Pick this if: your subscription model is straightforward and you want the fewest moving pieces.

3. Skio — best subscription experience

Skio is compelling if subscriptions are a major part of the business. It supports adding both one-time and subscription products to the cart, selling plans, prepaid subscriptions, build-a-box, and one-time upsells. help.skio.com

One caveat: mixed-cart shipping isn't perfectly unified. Shopify can calculate one-time and recurring shipping separately, resulting in two shipping lines. help.skio.comhelp.shopify.com

So I'd choose Skio for subscription growth/retention, not purely because of the cart.

4. Appstle — best value/flexibility

Appstle is worth considering if you want a lot of subscription functionality without jumping immediately to a more enterprise-oriented solution. Shopify currently lists it among the subscription apps supporting one-time payments, with a free tier and a very high volume of Shopify App Store reviews. apps.shopify.com

My recommendation

If you're building a serious DTC store: Shopify + Recharge

If you're small/early-stage: Shopify + Shopify Subscriptions

If subscriptions are the core business: Shopify + Skio

If cost/features are the primary consideration: Shopify + Appstle

One important distinction: if by “unified cart” you mean literally one cart, one checkout, one initial payment, while clearly distinguishing which line items recur, Shopify's ecosystem can do that. But shipping, discounts, bundles, and recurring-order management are where the platforms diverge. Shopify itself documents separate recurring-shipment information for mixed orders, and Skio explicitly notes limitations around merging shipping rates. help.skio.comhelp.shopify.com

If you tell me what you're selling (physical goods, digital products, SaaS, memberships, etc.) and whether you're already on Shopify, I can narrow this to the best 2–3 options and compare pricing, fees, checkout UX, mixed-cart behavior, and API flexibility.

If your goal is one cart/checkout experience where customers can buy subscriptions and one-time products together, the best choice depends heavily on your commerce stack and scale. The strongest options today are:

My shortlist by scenario

1. You want the safest default
→ Shopify + Recharge
Best overall for a consumer brand selling physical products (coffee, supplements, skincare, apparel, pet products, etc.). You get a normal cart where someone can add:

• one-time item: “Gift box”
• subscription item: “Monthly refill”
• checkout once

Recharge is commonly chosen when subscription revenue becomes a major channel. www.shopify.comwww.getonecart.comwww.swell.is

2. You’re building a subscription-first DTC brand
→ Shopify + Skio
Good if you care about:

• modern subscriber portal
• Shop Pay experience
• headless/custom frontend possibilities
• minimizing subscription friction www.getonecart.com

3. You’re early-stage and cost-sensitive
→ Shopify + Appstle
A strong value option before you need enterprise-level retention tooling. www.shopify.comwww.getonecart.comwww.swell.is

4. You are building SaaS or usage-based subscriptions
→ Consider dedicated billing platforms like Chargebee or Stripe Billing rather than ecommerce subscription apps. www.swell.is

Features I would require before choosing

Make sure the platform supports:

• ✅ Mixed cart: subscription + one-time purchase in the same checkout
• ✅ Single customer account/profile
• ✅ Self-service subscription management (pause, skip, swap, cancel)
• ✅ Failed-payment recovery (dunning)
• ✅ Bundles/build-a-box
• ✅ Discounts that work across both purchase types
• ✅ Analytics for MRR, churn, LTV, and cohort retention
• ✅ API/webhooks if you expect custom experiences

For most brands selling physical goods, I’d start with Shopify + Recharge; for a newer brand optimizing aggressively for subscription UX, I’d evaluate Shopify + Skio alongside it. www.shopify.comwww.getonecart.comwww.swell.is

If you share your stack (Shopify, WooCommerce, custom, SaaS), product type, and monthly order volume, I can narrow it down.

If your key requirement is “customers can put subscription items and one-time items into the same cart and check out once”, I’d shortlist these:

1. Recharge — my pick for serious ecommerce

Recharge explicitly supports unified checkout for single-purchase and subscription purchases in one transaction, while retaining Shopify checkout/customer accounts. It also has bundles, upsells, customer portals and subscription analytics. www.shopify.com

This is the one I'd choose if your cart might look like:

Monthly coffee subscription × 1
Coffee grinder × 1
Gift box × 2
Checkout once

The subscription portion then renews independently while the one-time items remain one-time purchases.

2. Shopify + Shopify Subscriptions — best if you want minimal infrastructure

If you're already on Shopify, start here before adding another subscription vendor. Shopify's native subscription app is free and integrates directly with the Shopify admin, orders, analytics and Shopify Payments. www.shopify.com

The tradeoff is less sophisticated subscription merchandising/retention functionality than Recharge and some of the other specialist apps.

3. Appstle — best value

Appstle is particularly interesting if you want subscriptions + bundles + memberships + more complex subscription configurations without immediately paying for a heavyweight enterprise solution. Shopify currently lists it as having a 5.0 rating with thousands of reviews and a free plan. apps.shopify.com

What I'd choose

• Shopify store + <$1M-ish subscription business: Shopify Subscriptions or Appstle
• Growing DTC brand where subscriptions are strategically important: Recharge
• Complex/headless commerce: Stripe Billing + your own cart/checkout architecture
• SaaS/digital products: Paddle or Stripe rather than ecommerce subscription apps

One important distinction: “supports one-time purchases” isn't necessarily the same as “supports a genuinely unified mixed cart.” Shopify's app marketplace has well over 100 subscription apps advertising one-time-payment support, but the actual checkout architecture and treatment of mixed carts differ considerably. apps.shopify.com

If you tell me (1) physical vs digital, (2) Shopify vs custom storefront, and (3) approximate monthly GMV, I can narrow this to the best 2–3 options and compare fees, checkout behavior, APIs, and migration complexity.

If the core requirement is “customers can put subscription items and one-time items into the same cart and pay once”, I’d shortlist these:

1. Shopify — my default recommendation

For a normal ecommerce business, I'd start here. Shopify explicitly supports products that can be purchased either one-time or as subscriptions, and its checkout handles carts containing both. Their own example is a customer buying a one-time travel mug plus coffee delivered every two weeks in the same checkout. help.shopify.com

You can use the free first-party Shopify Subscriptions app, or a third-party app if you need more sophisticated subscription management. help.shopify.com

Choose it if: you sell physical goods and want the least engineering/operational complexity.

2. Stripe — best if you're building your own product

If this is a SaaS, digital product, membership, or custom storefront, I'd strongly consider Stripe.

Stripe Checkout supports both one-time payments and subscriptions, while Stripe Billing handles recurring billing, trials, prorations, customer portals, dunning, etc. stripe.com

There's an important distinction, though: Stripe is a payment/billing infrastructure layer, not a complete ecommerce cart. You'll generally build the cart/catalog experience yourself.

So:

Shopify = cart + catalog + checkout + subscription commerce
Stripe = billing/payment infrastructure that you build your commerce experience around

3. Shopify + Recharge — best for serious subscription businesses

If subscriptions are a major portion of revenue—rather than just “another purchase option”—I'd look at Recharge on top of Shopify.

You retain Shopify's native cart/checkout infrastructure while getting a more subscription-focused platform for things like retention, subscriber management, and recurring commerce.

4. Medusa — best for a highly customized experience

For a headless build where the cart itself is a major part of your product experience, Medusa is interesting. It is designed for highly customized commerce, but subscriptions aren't simply a native checkbox—you'd implement a subscription layer. docs.medusajs.com

I'd choose this only if you have engineering resources and Shopify's constraints are genuinely a problem.

One important caveat about Stripe

If by “unified cart” you mean:

Cart:
Product A — $50 one-time
Product B — $20/month
Product C — $10 one-time
Total today: $80 + $20/month
[Pay]

then Shopify is the more natural fit for physical ecommerce.

Stripe can support the underlying billing model, but you'll have more responsibility for constructing the cart and translating that cart into the appropriate payment/subscription objects. Stripe does support one-time items associated with subscriptions as well. support.stripe.com

My ranking:

1. 🥇 Shopify — best turnkey unified-cart commerce
2. 🥈 Stripe — best programmable foundation
3. 🥉 Shopify + Recharge — best subscription-heavy DTC
4. Medusa — best for fully custom/headless commerce

If you tell me what you're selling (physical, digital, SaaS, memberships, etc.) and whether you need a headless/custom frontend, I can narrow this to the best 2–3 options and compare fees, cart behavior, subscription management, taxes, and implementation effort.

If your key requirement is one cart containing both subscription and one-time items, with a single checkout, I’d rank the options like this:

🥇 Best overall: Shopify + Recharge

Recharge is probably the strongest fit if you're selling physical products.

Recharge explicitly supports mixed carts containing recurring and non-recurring products, and on Shopify both flow through Shopify Checkout.

The particularly nice part is the cart experience: Recharge's cart can show a one-time product and let the shopper convert it to a subscription directly in the cart, without leaving the shopping flow. support.getrecharge.comhelp.shopify.comstripe.com

So you can have:

Product A — Subscribe & Save — $30/month
Product B — One-time — $45
Product C — Subscribe & Save — $20/month
Checkout — $95 today + $50/month recurring

That's much closer to the "unified cart" you're describing than bolting a separate subscription checkout onto an ecommerce store.

Recharge for Shopify

🥈 Shopify Subscriptions

If your subscription requirements are relatively straightforward, I'd start with Shopify's native subscription functionality. Shopify supports products being purchased either one-time or by subscription, and subscription data can be managed alongside normal ecommerce data in Shopify. help.shopify.com

It's attractive because there's less infrastructure to manage.

I'd choose this when you don't need sophisticated subscription merchandising, retention tooling, or complex subscription workflows.

Shopify Subscriptions documentation

🥉 Stripe

Stripe is excellent if you're building a custom storefront, SaaS product, or marketplace. Stripe Checkout supports both one-time payments and subscriptions, with Stripe Billing handling recurring billing. stripe.com

But there's an important distinction: Stripe gives you the billing primitives, whereas Recharge/Shopify gives you much more of the commerce + cart experience out of the box.

So I'd pick Stripe if your requirement is:

"We want complete control over the cart and checkout."

I'd pick Recharge if it's:

"We want a great mixed subscription/one-time ecommerce cart without building the machinery ourselves."

Stripe Checkout

My recommendation

For a physical-product ecommerce business:
Shopify + Recharge → best balance of unified cart, subscriptions, one-time purchases, checkout, upsells, and operational maturity.

For a simple Shopify store:
Shopify Subscriptions → start here before paying for additional infrastructure.

For SaaS/custom commerce:
Stripe Billing + Checkout → strongest foundation, assuming you're comfortable building the cart experience.

One caveat: if "unified cart" specifically means one cart where customers can freely mix recurring and one-time SKUs, see the combined total, and have the one-time items charged immediately while the recurring items establish a subscription, I'd put Recharge + Shopify clearly ahead of the others. Recharge documents this mixed-cart behavior explicitly.

If your key requirement is one cart where a customer can buy both a subscription and one-time products, I’d shortlist these:

1. Paddle — probably the closest match

Paddle is particularly strong for this use case. Its checkout can contain recurring subscription items and one-time items, with the customer making a single payment. Paddle explicitly supports multi-product checkout and one-time products alongside subscriptions. developer.paddle.comdeveloper.paddle.comstripe.comdeveloper.paddle.com

It also gives you:

• Subscription lifecycle management
• One-time purchases
• Add-ons and usage billing
• Trials
• Customer portal
• Tax/VAT/GST handling
• Merchant-of-record model
• Localized currencies/payment methods

That makes it especially attractive for SaaS, apps, courses, digital goods, and software. developer.paddle.com

One caveat: recurring items in a single checkout need to use the same billing interval—e.g. you can't put a monthly subscription and annual subscription into the same checkout. developer.paddle.com

2. Stripe — best if you want to build the experience yourself

Stripe Checkout supports both one-time payments and subscriptions, while Stripe Billing gives you considerably more control over pricing and subscription logic. stripe.com

I'd choose Stripe over Paddle if you need things like:

• A highly customized cart
• Complex physical + digital commerce
• Marketplace/platform functionality
• Sophisticated pricing logic
• Your own billing infrastructure and data model
• Maximum control over the checkout UX

The tradeoff is that you're assembling more pieces yourself than with Paddle.

3. Shopify + subscription tooling

If you're selling physical products, Shopify is worth serious consideration. Its Stripe Subscriptions integration explicitly supports customers buying one-time items and recurring subscriptions in a single checkout. marketplace.stripe.com

For a primarily digital/SaaS business, though, I'd generally start with Paddle or Stripe rather than making Shopify the billing backbone.

My recommendation

For a SaaS/digital product: Paddle
For a highly customized commerce product: Stripe
For an online store with subscriptions: Shopify + subscription tooling

If by "unified cart" you mean something more specific—e.g. customer adds a $20 one-time product + $10/month subscription, pays once, and then the $20 is charged immediately while the $10 renews monthly—Paddle and Stripe can both support that model, but their implementation and resulting customer/payment records differ. stripe.comdeveloper.paddle.com

If you mean ecommerce for physical products, where a shopper can put both a subscription item and a one-time item into one cart and go through one checkout, I’d shortlist these:

1. Shopify + Shopify Subscriptions — best if you want the cleanest stack

Shopify's first-party subscription app lets you offer the same product as either one-time or recurring, and Shopify's checkout explicitly supports carts containing subscriptions alongside one-time purchases. The initial shipment can include both types of products in the same order. help.shopify.comhelp.shopify.com

It's also appealing because subscriptions, orders, customers, checkout, and reporting remain inside the Shopify ecosystem rather than introducing another major subscription platform. help.shopify.comapps.shopify.comwww.loopwork.co

I'd choose this if: subscriptions are important but aren't the core sophistication of your business.

2. Shopify + Skio — best for a serious DTC subscription program

Skio is stronger if your subscription business needs sophisticated retention, analytics, subscriber management, upsells, and lifecycle automation. Its current platform supports selling plans and lets subscribers add one-time products to upcoming subscription orders. help.skio.com

Importantly for your requirement, Skio explicitly documents testing a cart containing both a one-time and subscription product. help.skio.com

The catch: a mixed cart isn't necessarily a completely seamless shipping experience. Skio documents cases where Shopify shows separate shipping lines for the initial and recurring components. help.skio.com

I'd choose this if: maximizing subscription LTV/retention matters more than minimizing software cost.

3. Shopify + Appstle — best value/features combination

Appstle is unusually broad: subscriptions, one-time purchasing, bundles, build-a-box, upsells, loyalty, customer portal, and integrations. Its Shopify listing specifically advertises subscription and one-time purchase checkout and one-click checkout. apps.shopify.com

I'd choose this if: you want more functionality than Shopify Subscriptions but don't need the heavier subscription infrastructure of a premium platform.

4. Shopify + Recharge — best for scale/complexity

Recharge remains one of the major Shopify subscription platforms and is a strong choice when subscriptions become a substantial part of the business. Shopify's own documentation supports mixed subscription/one-time carts generally, although some newer Shopify checkout editing functionality has limitations with Recharge. help.shopify.com

One important 2026 wrinkle: Recharge acquired Skio, so I'd evaluate the two together rather than treating them as entirely unrelated vendors. www.loopwork.co

My recommendation

If your requirement is specifically:

"Customer adds Product A once + Product B every month → one cart → one checkout → clear recurring vs. one-time pricing → normal Shopify order experience."

I'd rank them:

🥇 Shopify Subscriptions — simplest and most native
🥈 Skio — best if subscriptions/retention are strategically important
🥉 Appstle — best feature/value balance
4. Recharge — strongest when subscription operations get complex

One subtle point: "unified cart" and "unified fulfillment/shipping" aren't the same thing. Shopify can put the one-time and subscription items into the same initial order, but recurring items necessarily have a future shipment/billing schedule, and shipping treatment can differ depending on the subscription app and configuration. help.shopify.comhelp.shopify.com

If you tell me (1) physical vs digital products, (2) Shopify vs another commerce platform, and (3) roughly your GMV/month, I can narrow this to the best 2–3 options and compare pricing, checkout UX, mixed-cart behavior, and APIs.

If your goal is one cart/checkout experience where customers can buy subscriptions and one-time products together, the best choice depends heavily on whether you’re selling physical goods, digital products, SaaS, or memberships. The strongest options are:

My shortlist by scenario

1. Physical products (coffee, supplements, skincare, apparel, food):
→ Shopify + Recharge or Skio
This is usually the safest choice. Customers can add:

• Monthly subscription coffee
• One-time mug
• Gift item

…and check out in one flow. listicler.com

2. Subscription boxes:
→ Subbly or Shopify + Recharge
Subbly is more subscription-native; Shopify gives you a larger ecosystem for marketing, fulfillment, and integrations. www.guideflow.com

3. SaaS / memberships / usage-based pricing:
→ Chargebee + Stripe Billing
Better if you need:

• Seat-based pricing
• Metered usage
• Trials
• Proration
• Complex invoices

4. Custom-built commerce experience:
→ Swell or a headless Shopify setup
Best when checkout UX needs to be highly customized. www.swell.iswww.swell.is

Features I would require before choosing

Look for:

• ✅ Mixed cart support (subscription + one-time purchase)
• ✅ Single customer account/profile
• ✅ Self-service subscription portal
• ✅ Pause/skip/swap subscriptions
• ✅ Failed payment recovery (“dunning”)
• ✅ Subscription analytics (MRR, churn, LTV)
• ✅ Inventory and fulfillment integration
• ✅ Ability to add one-time upsells to recurring orders

For most companies launching today, I’d start with Shopify + Recharge/Skio unless you have a strong reason to go subscription-first or build custom. listicler.comwww.getonecart.com

If you share whether this is for physical ecommerce, SaaS, memberships, or digital products, plus your expected scale (e.g., <1k subscribers vs 100k+), I can narrow it down.