Answers that do not mention MailerLite

If you mean an agency managing email campaigns and reporting for multiple clients, I’d shortlist these:

• activecampaign.com — best overall for automation-heavy agencies. It supports agency/partner workflows and centralized management, and is particularly strong if you’re building sophisticated automations, CRM pipelines, and lifecycle campaigns. BestSends BestSends
• campaignmonitor.com — best for straightforward multi-client management. Its agency setup lets you manage separate client accounts, campaigns, permissions, billing and reporting from one place rather than repeatedly logging into separate accounts. Campaign Monitor
• brevo.com — good if you have lots of smaller clients. It offers sub-organization functionality and can be more economical when managing many relatively small accounts. BestSends Sasanova
• klaviyo.com — best for ecommerce clients. I'd choose it when most clients are Shopify/WooCommerce-style brands and revenue attribution and customer segmentation matter more than generic agency management. BestSends

My pick

If your main pain is “I have 10–30 clients and don't want to log in/out, manually compile reports, and juggle accounts,” I'd start with ActiveCampaign or Campaign Monitor.

If you tell me roughly how many client accounts you manage, whether they're mostly ecommerce or local/B2B, and whether you need white-label reports, I can narrow it to the best 1–2 options and compare pricing/features.

Yes. What you’re describing is essentially an agency multi-client brand/content platform: one agency account, but isolated workspaces/brands with their own templates, users, permissions, and ideally billing.

A few platforms are close:

Marq is particularly close

Marq explicitly supports multiple brands in one account, with users seeing templates based on their assigned brands. It also lets you assign templates to particular brands, maintain separate brand assets, and switch between brands when creating content. Marq Help Center Marq Help Center

Its permission model goes fairly deep: groups/subgroups can have different access to projects, templates and folders, and there are separate user, template-admin and team-admin roles. Marq Marq Help Center

marq.com

The important distinction: billing

If by “billing per client” you mean:

Agency has Client A, B, C → each client has its own users/brand/templates → agency can charge Client A $X/mo, Client B $Y/mo → ideally client can pay directly

that's a more specific requirement. Most design/brand platforms don't handle this natively as a true agency billing hierarchy. They tend to treat the agency as one organization/account and billing as an account-level function.

So if you're evaluating this because you're looking to build or buy something for an agency, I'd define the ideal architecture as:

AGENCY
│
├── Client A
│   ├── Brand kit
│   ├── Templates
│   ├── Users & permissions
│   ├── Projects
│   └── Billing / subscription
│
├── Client B
│   ├── Brand kit
│   ├── Templates
│   ├── Users & permissions
│   ├── Projects
│   └── Billing / subscription
│
└── Client C
    ├── Brand kit
    ├── Templates
    ├── Users & permissions
    ├── Projects
    └── Billing / subscription

The agency admin can see/manage everything, while a client admin sees only their own workspace.

If that's the exact product you're looking for, I can also give you a shortlist of 5–10 platforms specifically designed for agencies managing multiple client brands, including which ones support white-labeling, client portals, Stripe/subscription billing, template locking, and separate client workspaces.

Yes. If by “agency” you mean one agency account that can manage many clients, with each client having its own brand assets/templates, user permissions, and ideally billing, there are platforms that get quite close.

Best fits

• Marq — probably the closest fit for an agency doing repeatable branded content. It supports multiple brands in one account, brand-specific access, smart templates that automatically swap logos/colors/fonts, and granular roles/permissions. Marq Help Center Marq Marq Help Center

marq.com

• Frontify — stronger if you're essentially building a brand portal for each client. It explicitly markets to agencies with “multiple clients, one dashboard,” and supports separate brand homes, templates, assets, external-partner permissions, and granular access. Frontify Frontify Frontify Knowledge Base

frontify.com

The important distinction: billing

The brand/template/permission side is well covered by these platforms. The harder requirement is client-level billing—e.g.:

Agency account
→ Client A → Brand A → 8 users → $500/mo
→ Client B → Brand B → 3 users → $250/mo
→ Client C → Brand C → 15 users → $900/mo

That's less common. Many platforms treat billing at the agency/account level, rather than making each client a completely isolated billable tenant.

If you're asking because you're thinking about building this as a SaaS/product, that's actually a very recognizable product architecture: Agency → Clients → Brands → Workspaces → Templates → Users/Roles → Usage/Billing.

If you tell me what the agency is producing (e.g. social posts, ads, PDFs, websites, presentations, email campaigns, AI-generated content), I can give you 5–10 platforms that specifically support this agency/multi-client model, including which ones handle separate client billing.

For white-label email performance reporting + custom client-facing dashboards, I’d shortlist tools based on whether you need (a) an agency reporting portal, (b) embedded analytics, or (c) a dashboard layer that connects to your email platform.

Best overall picks

My recommendations by use case

1. Agency sending monthly email performance reports

Choose AgencyAnalytics.

Good fit if you want:

• One login portal per client
• Your logo/colors/domain
• Automated reports
• Multiple marketing channels in one dashboard

It is designed specifically around agency-client reporting workflows and supports white-label dashboards and branded reporting features. AgencyAnalytics AgencyAnalytics

2. You want a “your brand, your analytics product” experience

Choose Zoho Analytics or ClicData.

These are stronger if you want:

• Custom client portals
• Multiple client accounts with permissions
• Embedded dashboards
• Custom calculated metrics
• Data from several email platforms combined

Zoho Analytics supports white-labeled dashboards, branding, domain customization, role-based access, and connections to many data sources. Zoho Zoho ClicData similarly focuses on full white-label analytics experiences with branded portals and delivery. ClicData

3. You are building a SaaS-style reporting product

Consider:

• Klipfolio
• Zoho Analytics
• ClicData

Look for:

• API access
• Multi-tenant security
• Embedded dashboards
• Customer-level data isolation
• Custom domains

Email metrics I’d include in the dashboard

A strong client-facing email dashboard usually has:

Executive view

• Revenue attributed to email
• Subscribers added/lost
• Campaign performance trend
• Top-performing campaigns
• Engagement score

Campaign performance

• Sends
• Delivery rate
• Open rate (where available)
• Click-through rate
• Click-to-open rate
• Conversion rate
• Revenue per recipient

Automation/flows

• Welcome series performance
• Abandoned cart recovery
• Lifecycle flow revenue
• Flow conversion rates

List health

• Growth rate
• Engagement segments
• Deliverability indicators
• Unsubscribe/spam complaint trends

My pick

For most agencies: AgencyAnalytics + email-platform connectors/API data.
For a premium branded client portal: Zoho Analytics.
For a white-label analytics product you resell: ClicData or Zoho Analytics.

The deciding question is whether you need a reporting tool for your agency or a software product clients perceive as your own.

If you’re an agency managing multiple ecommerce clients and need both email + SMS from one interface, I’d narrow it to HighLevel vs. Klaviyo.

My pick: Klaviyo for ecommerce agencies

Klaviyo is probably the better fit if your clients are primarily Shopify/DTC brands. It’s built around ecommerce data, segmentation, revenue attribution, abandoned-cart flows, post-purchase automation, and coordinated email/SMS campaigns.

Klaviyo now supports multiple accounts under one login, plus portfolios that give agencies a high-level view across multiple accounts. Klaviyo Help Center Klaviyo Help Center

The downside is that it's still fundamentally one account per ecommerce business, rather than a true agency operating system.

Pick HighLevel if agency management is the priority

HighLevel is stronger if you want one agency dashboard containing many client sub-accounts, with email, SMS, CRM, automation, conversations, reporting, and potentially white-labeling.

HighLevel specifically supports separate client sub-accounts, centralized agency management, cloning workflows, and a unified inbox. GoHighLevel HighLevel Support Portal Its Agency Unlimited plan currently supports unlimited sub-accounts, while Pro adds SaaS/white-label capabilities. GoHighLevel

Quick decision

So if you mean “I run an ecommerce marketing agency with 10–50 Shopify clients and my team needs to jump between their email/SMS accounts,” I'd start with Klaviyo.

If you mean “I want my agency to operate everything for clients from one master dashboard and potentially sell the software itself,” I'd choose HighLevel.

One interesting wrinkle: Klaviyo also has shared billing for account families, although self-serve shared billing is currently limited to 20 accounts, so that's more useful for related brands than a large agency client roster. Klaviyo Help Center

If you tell me roughly how many clients you manage (e.g. 10, 50, 200) and whether they're mostly Shopify, I can give you a much more specific recommendation—including pricing and the best agency setup.

Yes. If by “client lists” you mean email/SMS audiences, there are several good options—but the best choice depends on whether you want one centralized agency dashboard or simply a powerful platform you can replicate across clients.

My shortlist

• ActiveCampaign — probably my best overall pick for a small agency. It has strong segmentation, automation, and split testing (up to five variations), and it’s well suited to standardizing workflows across clients. ActiveCampaign BestSends
• Campaign Monitor — arguably the easiest agency-oriented option. It specifically supports separate client accounts, client permissions, reporting, billing, templates, and white-labeling from an agency setup. Campaign Monitor
• Klaviyo — excellent if most of your clients are e-commerce/Shopify brands. Segmentation and experimentation are very strong, and its newer agency/AI tooling makes cross-client management more practical. Klaviyo Help Center
• Customer.io — worth considering if your clients need sophisticated behavioral segmentation, event-triggered campaigns, and experimentation rather than traditional newsletter marketing. Customer.io
• Brevo — attractive if you're managing lots of smaller clients and keeping costs low is important. It's simpler, though, and its multi-client setup isn't as elegant as Campaign Monitor's. BestSends

What I'd choose for a small agency

If your workflow is something like:

10–30 clients → each has their own list → create segments → run A/B tests → automate campaigns → report results → repeat

I'd narrow it to:

Campaign Monitor if your priority is simplicity + managing lots of client accounts.

ActiveCampaign if your priority is segmentation + automation + testing sophistication.

Klaviyo if you're primarily an e-commerce retention agency.

There's also a separate category worth knowing about: if by “split testing” you mean website/landing-page experiments rather than email A/B tests, Convert is specifically built for agencies managing experiments across multiple client accounts. A/B Testing Software

If you tell me roughly how many clients/lists you manage, whether it's email or SMS, and whether the clients are mostly e-commerce/B2B/local businesses, I can narrow this to the 2–3 platforms that make the most sense and compare their pricing/workflow for an agency.

If your agency needs one platform where each client can have isolated email access, different internal roles, and granular permissions, I’d recommend Front.

Why it stands out:

• Separate workspaces per client: You can create a workspace for each client and control which teammates can access each one. Front Help Center
• Restricted inbox access: Within a workspace, individual shared inboxes can be limited to specific users or groups. Front Help Center
• Granular roles: Front's newer permissions system supports workspace-level permission sets and specific controls for things like sending, assigning, managing inboxes, templates, rules, analytics, and more. Front Help Center
• Groups make scaling easier: You can create groups such as Client A Team, Client B Team, Account Managers, or Junior Agents and assign workspace/inbox permissions to the group. Front Help Center
• Good agency workflow: Agents can collaborate internally on emails without exposing internal comments/drafts to the client.

How I'd structure it

For example:

Then each client could have inboxes such as support@, sales@, and billing@, with access independently controlled.

One important caveat: Front's workspaces are excellent for access/workflow separation, but they aren't a perfect data silo. Front explicitly notes that some contact/account information can remain visible across workspaces. Front Help Center If your requirement is hard tenant isolation—where Client A's data must be completely invisible to everyone working on Client B—I'd evaluate a true multi-tenant platform rather than assuming a workspace equals a security boundary.

If by "email work" you mean cold outbound/email campaigns rather than shared client inboxes, I'd choose differently—platforms such as Smartlead or EmailBison are more appropriate for agency-managed client sending. hothawk.ai

If by “agency-friendly billing” you mean one agency account pays for the underlying usage, while each client can be charged centrally for email sends, SMS usage/credits, and recurring or one-off services, there are a few categories worth considering.

Strong fit: gohighlevel.com

HighLevel is particularly designed around this agency/reseller model.

• Central agency wallet: your agency funds usage centrally, including phone/SMS, email, AI, email validation, and other usage-based services. HighLevel Support Portal HighLevel Support Portal
• Client rebilling: supported usage can be automatically passed through to individual client sub-accounts.
• Markup: on the $497/month Agency Pro plan, you can rebill supported phone and email usage with an agency markup, rather than merely passing through your cost. GoHighLevel HighLevel Support Portal
• SMS: its native phone system handles SMS/MMS, with usage-based billing and rebilling. HighLevel Support Portal
• Email: email usage can likewise be rebilled to sub-accounts. HighLevel Support Portal
• Services: HighLevel also has a reselling system for things such as listings, domains, WhatsApp, WordPress hosting, SEO-related services, and other add-ons, where you can establish a client-facing price. HighLevel Support Portal
• SaaS mode: Agency Pro adds automated sub-account creation and a SaaS configurator, making it possible to sell your own packaged offering under your agency brand. GoHighLevel

So you could conceptually have:

Client A → $299/mo platform + $X SMS + $Y email + $Z services
Client B → $499/mo platform + $X SMS + $Y email + $Z services

while your agency maintains the underlying wallet/vendor relationship.

Other platforms worth investigating

Vendasta is more oriented toward agencies that want to resell a catalog of third-party software/services to clients. That's potentially a better architectural fit if “services” is the important part—for example, selling reputation management, SEO, websites, advertising, etc.—rather than primarily operating the clients' CRM/marketing automation. Stack Space Solutions

There is also a distinction worth making:

The key thing I'd investigate for your use case is HighLevel's distinction between rebilling and reselling. Rebilling is specifically designed for consumption such as SMS/email, whereas reselling is designed for packaged services/subscriptions. HighLevel Support Portal

If you tell me what you're currently using for email/SMS (e.g. Twilio, Mailgun, SendGrid, Klaviyo, etc.) and what “services” you want to bill for, I can compare HighLevel vs Vendasta vs a Stripe-based setup vs building your own agency billing layer, including how each handles credits, markup, invoices, prepaid balances, and usage tracking.

If your goal is “one agency account pays for everything, then we centrally charge each client for their SMS/email usage + our services”, HighLevel is probably the closest fit.

Best options

1. HighLevel — strongest match

gohighlevel.com is specifically designed around the agency/reseller model.

Its Agency Wallet lets you centrally fund usage. Client sub-accounts consume that balance for things such as email, SMS/phone, AI and other usage-based services. You can then rebill the client, either at cost or with a markup depending on your plan. HighLevel Support Portal HighLevel Support Portal

For example:

Client A → 50,000 emails + 2,000 SMS → HighLevel tracks usage → your agency pays the underlying cost → Client A is automatically charged according to your pricing.

HighLevel also supports SaaS Mode, where you can sell subscriptions and automatically rebill clients for SMS, email and other usage. GoHighLevel

The particularly useful part for your use case is that you can combine usage billing + recurring services. So you could have:

• $499/month marketing service
• $50 SMS credit bundle
• $25,000 email credits
• $0.02/SMS overage
• Website hosting
• AI usage
• Automation/workflow charges
• One-off setup fees

all under the same client relationship.

HighLevel's current documentation also explicitly describes client wallets, auto-recharge, usage thresholds, rebilling and agency markups. HighLevel Support Portal

If you're an agency building a repeatable client-billing model, this would be my first platform to evaluate.

2. Vendasta — better if you're selling lots of different services

vendasta.com is worth looking at if your business is more of a multi-product agency/reseller than primarily a CRM/communications agency.

It has centralized client billing, recurring invoices, one-time charges, setup fees, product catalogs and white-labeled purchasing. Vendasta Vendasta

The distinction is that Vendasta is stronger as a “sell and bill a catalog of services/products” platform, whereas HighLevel is stronger when the actual underlying service is CRM + marketing automation + email/SMS + communications.

3. Twilio + Stripe — best if you're building your own system

If you have a technical team and want complete control, Twilio + Stripe is probably the most flexible architecture.

You'd maintain:

• Client accounts
• Usage ledger
• SMS credits
• Email credits
• Service subscriptions
• Markups
• Minimum balances
• Auto-recharge
• Invoices
• Stripe payment methods

Twilio handles the communication infrastructure while Stripe handles the money. But you'd have to build the agency billing layer yourself. That's a substantial difference from HighLevel.

My recommendation

If your requirements are specifically:

Agency pays centrally → clients consume SMS/email → usage gets tracked per client → clients automatically pay you → you add markup → you also charge monthly service fees

I'd rank them:

1. HighLevel — best out-of-the-box
2. Vendasta — best for a broad agency/reseller catalog
3. Twilio + Stripe — best if you're building a proprietary platform

One important caveat: HighLevel's exact rebilling capabilities depend on the plan and whether you're using its LC Email/LC Phone versus external Twilio/Mailgun, so I'd validate your desired pricing model against the current plan before committing. HighLevel's current documentation says markup-based rebilling is available on its Agency Pro/SaaS setup for supported services. HighLevel Support Portal HighLevel Support Portal

If you tell me what you're actually selling (e.g. email marketing, SMS, AI, websites, ads, CRM) and roughly how many clients, I can narrow this down to the best 2–3 platforms and show you how the billing flow would work.

If you mean an agency managing lifecycle/CRM automation for multiple clients and wanting to launch standardized experiments and compare results across accounts, my top pick is Customer.io.

My shortlist

Why I'd choose Customer.io: its workspace model maps unusually well to an agency structure. You can create separate workspaces for different products/sites, with each workspace having its own profiles, automations, metrics and data; workspaces can also be used as isolated testing environments. You can copy workflow actions between workspaces, which is particularly useful when you're repeatedly deploying a proven lifecycle framework to different clients. Customer.io Customer.io

It also supports email, push, in-app, SMS and other channels, so you're not limited to email automation. Customer.io Customer.io

But there's an important distinction

If your actual goal is:

"I want to build the same lifecycle campaign for 10–50 clients, change the inputs, run controlled variants, and get one agency-wide dashboard showing which strategy wins."

Then Customer.io isn't quite the complete answer by itself. Its workspaces give you client isolation and reusable workflows, but you'll probably want a separate agency-level analytics/experimentation layer to normalize results across clients.

If you're doing large enterprise/mobile clients, I'd instead seriously consider Braze. Its Canvas supports multiple journey variants and automatic optimization based on variant performance, and Braze is built around cross-channel lifecycle orchestration. SEC Braze

What I'd pick by agency type

• 5–30 SaaS/product clients: Customer.io
• Large consumer/mobile clients: Braze
• Large mid-market/enterprise marketing programs: Iterable
• Ecommerce/DTC portfolio: Klaviyo
• B2B clients where CRM + marketing are inseparable: HubSpot

One caveat: none of these is really purpose-built as an "agency operating system for lifecycle experimentation." If that's specifically the product you're looking for—client isolation + reusable campaign templates + simultaneous execution + cross-client experiment comparison + agency-wide reporting—that's a narrower category, and I can compare the best tools specifically against those requirements. trypropel.ai

Why I'd choose Customer.io: its workspace model maps unusually well to an agency structure. You can create separate workspaces for different products/sites, with each workspace having its own profiles, automations, metrics and data; workspaces can also be used as isolated testing environments. You can copy workflow actions between workspaces, which is particularly useful when you're repeatedly deploying a proven lifecycle framework to different clients. Customer.io Customer.io

It also supports email, push, in-app, SMS and other channels, so you're not limited to email automation. Customer.io Customer.io

But there's an important distinction

If your actual goal is:

"I want to build the same lifecycle campaign for 10–50 clients, change the inputs, run controlled variants, and get one agency-wide dashboard showing which strategy wins."

Then Customer.io isn't quite the complete answer by itself. Its workspaces give you client isolation and reusable workflows, but you'll probably want a separate agency-level analytics/experimentation layer to normalize results across clients.

If you're doing large enterprise/mobile clients, I'd instead seriously consider Braze. Its Canvas supports multiple journey variants and automatic optimization based on variant performance, and Braze is built around cross-channel lifecycle orchestration.

Yes. If the requirement is “dozens of client accounts → standardize the metrics → roll them up → produce one weekly export,” I’d look first at AgencyAnalytics and Databox.

For your specific use case

AgencyAnalytics is probably the closest match. Its roll-up reporting is explicitly designed to combine performance data from multiple clients into a single report/dashboard, and you can select individual clients or groups, with a current maximum of 50 clients per roll-up. AgencyAnalytics AgencyAnalytics

It also supports recurring schedules, including weekly reporting, and has bulk operations for agencies managing tens or hundreds of clients. AgencyAnalytics AgencyAnalytics

Databox becomes interesting if the “export” is really a standardized analytics dataset rather than a polished client PDF. Its agency setup gives each client a separate account while allowing the agency to manage them centrally, and its higher agency tier supports unlimited client accounts and 130+ data sources. Databox Databox

Whatagraph is another strong candidate if you're aggregating lots of advertising/marketing channels. Its current plans specifically emphasize cross-channel aggregation and automated weekly/monthly client reporting. help.whatagraph.com help.whatagraph.com

If by “one weekly export” you mean something more specific—e.g. one CSV/Excel containing one row per client with 20 standardized KPIs—that's a somewhat different requirement, and I'd narrow the recommendation considerably.

Yes. If you mean “one agency-level weekly export that rolls up dozens of separate client accounts”, there are a few good options, and I’d narrow it to these:

• agencyanalytics.com — best purpose-built agency option. It has separate client workspaces, reusable templates, 85+ integrations, scheduled weekly reports, and—most importantly for your use case—Roll-up Reports that aggregate metrics across multiple clients into one report/dashboard. AgencyAnalytics AgencyAnalytics
• databox.com — best if you want an agency-wide operating dashboard in addition to exports. It supports separate client accounts, reusable account templates, cross-client analysis, scheduled reports, and 130+ integrations. Databox Databox
• whatagraph.com — worth considering if the output needs to be particularly polished/client-facing. It's more oriented toward consolidating multiple marketing sources into presentation-ready reporting.

What I'd pick

For “every Monday, pull the same KPIs from 30–100 client accounts and give my team one consolidated export”, I'd start with AgencyAnalytics. Its roll-up functionality is unusually directly aligned with that workflow: you can select a group of clients and aggregate metrics such as spend, clicks, conversions, traffic, etc., rather than manually stitching spreadsheets together. AgencyAnalytics

If the goal is instead “give management a weekly agency-wide performance cockpit, identify which accounts are slipping, and then produce client reports”, I'd lean Databox because its cross-client analysis and agency-level monitoring are stronger parts of the product. Databox

One important distinction: if by “weekly export” you mean a single CSV/Excel file containing one row per client with standardized KPIs, rather than a PDF/dashboard report, I'd evaluate the platforms somewhat differently.

If you tell me what accounts you're consolidating (e.g. Google Ads + Meta + GA4 + HubSpot, Amazon, SEO, etc.) and roughly how many clients, I can recommend the best architecture and compare AgencyAnalytics vs Databox vs Whatagraph vs a custom Looker/Sheets setup.

If you mean an agency-oriented platform where you can build modular email designs once and reuse them across multiple client accounts, Stripo is one of the strongest fits.

• Reusable modules: Save headers, footers, CTAs, product cards, etc. as modules and reuse them across emails. Modules can also be synchronized so one update propagates to emails using them. support.stripo.email
• Client/project separation: Stripo supports separate projects for different clients, with distinct settings, templates, and collaboration workflows. support.stripo.emailmemo.lywww.audienceful.comsupport.omnisend.comwww.modular-mail.com
• Cross-client reuse: Templates can be copied, moved, or shared between projects and even organizations, with the option to bring along their modules. support.stripo.email
• Built specifically for agencies: Stripo explicitly markets multi-client workflows, reusable modules, client-specific design systems, permissions, and collaboration. stripo.email

Stripo for agencies

Other platforms worth considering:

• Memo.ly — particularly interesting if you want client workspaces, Brand Kits, reusable blocks, review/approval, and clean HTML export while keeping sending in each client's existing ESP. memo.ly
• Audienceful — emphasizes separate client workspaces plus reusable templates across clients. www.audienceful.com
• Omnisend — especially useful if your agency manages ecommerce stores; its Partner Portal lets you create templated accounts and copy campaigns/automations/forms to multiple client stores. support.omnisend.com
• Modular Mail — more focused on the agency handoff problem: locked modules and client self-service without clients breaking the underlying design. www.modular-mail.com

My pick: Stripo if your priority is “build a modular design system once, then efficiently adapt it for many clients.” If your priority is “give each client their own workspace and let them self-serve safely,” Memo.ly or Modular Mail may be more interesting.

If your priority is agencies creating modular email systems once and reusing them across multiple client accounts, I’d shortlist these:

• modular-mail.com — probably the closest match. You build a reusable module library, lock the layout, and give each client their own workspace. Clients can edit defined content fields without breaking the design. Modular Mail Modular Mail
• memo.ly — strong agency-focused option with separate client workspaces, Brand Kits, reusable blocks, review/approval, and HTML export to the client's existing ESP. Memo
• beefree.io — more of a full visual email builder, with centralized agency workspaces, client-specific branding, reusable blocks and templates. Beefree
• omnisend.com — particularly useful for ecommerce agencies. Its Partner Portal lets agencies create templated accounts and copy campaigns, signup forms, and email templates into client stores. Omnisend Help Center
• audienceful.com — designed around separate client workspaces and reusable templates across accounts. Audienceful

My pick

If you mean “build a library of reusable modules once, then deploy/adapt those modules for many clients”, I'd start with Modular Mail.

If you mean “manage many client accounts and actually send campaigns from the same platform,” I'd look more closely at Omnisend or Campaign Monitor. Campaign Monitor explicitly supports managing multiple client accounts, templates, campaigns, permissions, billing, and reporting from an agency-oriented platform. campaignmonitor.com

If you tell me whether your agency primarily uses Klaviyo, HubSpot, Mailchimp, or another ESP, I can narrow this to the best 2–3 options.

If you're an agency building custom integrations for multiple clients, I'd put useparagon.com at the top of the list.

Why Paragon fits an agency model

• API-first: You can make authenticated requests to third-party APIs rather than being limited to prebuilt actions. Paragon Integration Infrastructure Paragon Integration Infrastructure
• Custom connectors: You can build connectors for APIs that aren't in its catalog, including custom auth and endpoints. Paragon Integration Infrastructure
• Multi-client architecture: Integrations can be deployed across your users/customers, with separate credentials and authorization contexts. It explicitly supports multiple connected accounts for the same integration. Paragon
• OAuth/API-key management: Paragon handles authentication and token refresh, which is particularly valuable when you're maintaining integrations for many clients. Paragon Integration Infrastructure
• Webhooks + retries + monitoring: Useful when you're responsible for production integrations rather than one-off automation scripts. Paragon Integration Infrastructure
• Embeddable/white-label UX: If your clients' end users need to connect their own accounts, you can use its Connect Portal or build your own UI on top of its APIs. Paragon Integration Infrastructure

How I'd compare the main options

The key distinction: if your agency is building bespoke integrations—e.g. "Client A uses Salesforce + their proprietary API, Client B uses HubSpot + a custom ERP, Client C needs a webhook-driven sync"—I'd favor Paragon or Nango over a purely unified API.

If instead you're trying to build one integration layer that you can reuse across dozens of clients, Merge/Apideck become more attractive because they normalize common categories behind one API. Merge, for example, provides unified APIs across CRM, HRIS, ATS, accounting, ticketing, file storage, etc. Merge API Documentation Merge API Documentation

My pick for an agency: Paragon if you want managed infrastructure and fast delivery; Nango if your team is highly technical and wants to own more of the integration logic.

If you tell me what kinds of integrations your agency builds (CRM, ERP, marketing, payments, AI agents, etc.) and whether each client needs their own credentials, I can narrow this down to the best 2–3 options and compare pricing/architecture.

If you’re an agency managing many ecommerce clients, the key question isn’t just “which automation tool has the most integrations?” It’s how well it handles reusable workflows, client separation, monitoring, credentials, and scaling across dozens of stores.

My shortlist

1. Make — probably the best starting point for an agency

make.com is particularly well suited to the model you're describing.

It has 3,000+ integrations, custom API connectivity, visual workflows, and explicit partner/solution-partner programs. Make Make

For example:

Shopify order → check conditions → create order in ERP → notify fulfillment → update CRM → send Slack alert → log to Airtable

Make supports Shopify and WooCommerce triggers/actions, including new-order events. Make Make

The big attraction for an agency is that you can build fairly sophisticated workflows without having to maintain a custom integration service for every client.

I'd look at Make first if you're managing ~5–50 ecommerce clients.

2. Celigo — much more serious integration infrastructure

celigo.com is worth looking at if your agency is doing high-volume ecommerce integrations, particularly Shopify/Amazon/ERP/3PL/EDI-type work.

Celigo specifically focuses on commerce integrations and supports order-to-cash, inventory, fulfillment, marketplaces, ERP, 3PLs and EDI. Celigo

It also has a more mature environment model: Professional and Enterprise customers can create up to 100 isolated environments for development, QA and production. Celigo Help Center

That's much closer to an integration platform than a general-purpose automation tool.

I'd investigate Celigo if you're doing things like:

• Shopify → NetSuite
• Shopify → 3PL
• Amazon → ERP
• multiple marketplaces → central inventory
• EDI / wholesale integrations
• thousands or millions of order events
• integrations that need serious monitoring and operational reliability

3. n8n — attractive if your agency is technical

n8n.io is another interesting choice if you have developers and want more control over the infrastructure.

It's particularly compelling when workflows become highly customized and you don't want to be constrained by a SaaS automation platform's pricing/model.

I'd put it ahead of Make when your agency is comfortable owning more of the technical infrastructure.

The distinction I'd make

If your agency is essentially:

“We build automations for ecommerce brands.”

→ Make

If you're becoming:

“We are the integration infrastructure connecting our clients' ecommerce, ERP, fulfillment and marketplace ecosystems.”

→ Celigo

If you're becoming:

“We're a technical automation company and want to own/control the workflow infrastructure.”

→ n8n

And if you're doing relatively straightforward:

“When an order happens, do these 3–5 things.”

→ Zapier can still work, although I'd generally investigate Make first for an ecommerce-heavy agency because of its workflow flexibility and broad app/API coverage. Make currently advertises thousands of integrations and an HTTP/custom-app route for systems without a native connector. Make Make

One thing I'd prioritize heavily

For an agency, multi-client architecture matters more than the raw number of integrations.

Before committing, I'd specifically test:

• Can you create a template workflow and deploy it to 20 clients?
• Can each client have separate API credentials?
• Can you update the underlying automation without breaking client-specific customizations?
• Can you see failures per client/store?
• Can clients have their own access without seeing other clients?
• Can you easily clone a Shopify → ERP integration?
• Can you handle client-specific mappings/fields?
• Can you retry failed orders safely?
• Can you audit exactly what happened to an individual order?
• Does pricing remain sensible when you have 50, 100, or 500 stores?

That last point can completely change the answer.

If you tell me roughly how many clients/stores you're managing (e.g. 10, 50, 200+) and which ecommerce systems you're integrating (Shopify, WooCommerce, Amazon, BigCommerce, etc.), I can narrow this down to the architecture I'd use and compare the likely costs.

“We build automations for ecommerce brands.”

→ Make

If you're becoming:

“We are the integration infrastructure connecting our clients' ecommerce, ERP, fulfillment and marketplace ecosystems.”

→ Celigo

If you're becoming:

“We're a technical automation company and want to own/control the workflow infrastructure.”

→ n8n

And if you're doing relatively straightforward:

“When an order happens, do these 3–5 things.”

→ Zapier can still work, although I'd generally investigate Make first for an ecommerce-heavy agency because of its workflow flexibility and broad app/API coverage. Make currently advertises thousands of integrations and an HTTP/custom-app route for systems without a native connector.

For an agency managing many ecommerce clients, you usually want something different from a merchant-facing automation tool. The important features are:

• Multi-tenant/client accounts
• Reusable workflows/templates
• Lots of ecommerce connectors
• Order-event triggers (order created, paid, fulfilled, refunded, cancelled)
• Data mapping/transformation
• Error monitoring and retries
• Client-friendly reporting/access controls
• Ability to hand off maintenance without custom code everywhere

The best options depend on whether you are building integrations as a service or just managing client automations.

Best overall agency-oriented options

syncspider.com — Best fit for ecommerce agencies

Good if your agency repeatedly builds Shopify/WooCommerce/Amazon/etc. automations for different clients.

Strengths:

• Designed specifically around ecommerce agencies
• Client sub-accounts
• Prebuilt ecommerce integrations
• Workflow automation without heavy development
• Good for recurring agency retainers

Typical use cases:

• Shopify → CRM
• Shopify → email/SMS platform
• WooCommerce → accounting
• Marketplace → inventory sync
• Order → fulfillment workflows

SyncSpider

make.com — Best flexible automation platform

Great if your agency handles many different app combinations.

Strengths:

• Huge integration ecosystem
• Visual workflow builder
• Webhooks and API calls
• Good for custom client logic
• Easier for non-developers than building integrations

Weakness:

• Ecommerce order handling can become messy at scale unless you build good standards/templates.

Best for:

• Agencies doing mixed stacks: - Shopify
• Klaviyo
• HubSpot
• Airtable
• Slack
• ERP systems

zapier.com — Best for simpler client automations

Good for marketing and CRM workflows.

Examples:

• New Shopify order → create CRM contact
• New customer → add email segment
• Refund → notify Slack channel

Less ideal for:

• High-volume order processing
• Complex fulfillment logic
• Large catalogs

For heavier ecommerce operations

getdropstream.com — Best for fulfillment/order integrations

Better when clients need operational reliability rather than marketing automation.

Strengths:

• Ecommerce, marketplace, ERP, WMS, and 3PL connections
• Order routing
• Inventory synchronization
• Fulfillment workflows
• Monitoring/recovery

Useful for agencies serving:

• DTC brands
• Wholesale companies
• Multi-channel sellers

DropStream

linnworks.com — Best for marketplace-heavy clients

More of an ecommerce operations hub.

Good for:

• Amazon + Shopify + eBay + marketplaces
• Inventory
• Order routing
• Shipping workflows

Less of an agency automation builder, more of an operations platform. Linnworks

If you are building a serious integration agency stack

A common setup would be:

My shortlist by agency type

Mostly Shopify/WooCommerce clients
→ SyncSpider + Make

Enterprise ecommerce clients
→ Workato or Tray.io + custom APIs

Fulfillment, ERP, warehouse integrations
→ DropStream

Marketing automation agency
→ Make + Klaviyo + Shopify integrations

Need a repeatable “integration-as-a-service” offering
→ SyncSpider is probably the closest match

One question would narrow this down a lot: are you trying to manage automations for clients as an agency service, or are you trying to build a SaaS/platform where clients connect their stores themselves?

Yes. There’s a fairly established category for this: client proofing / creative approval software. A few platforms are especially relevant to agency workflows.

Best fits for email-copy approval

• writerflow.com — Probably the closest match if your core problem is written content/email drafts rather than visual creative. Clients get a review link, can comment or request changes, and explicitly approve a particular version. It also keeps the approval tied to the exact version and reviewer. Writerflow Writerflow
• filestage.io — More established general-purpose proofing. Upload a document/PDF, have clients comment directly on it, manage review rounds, and capture final approval. It is explicitly positioned for agencies and claims to reduce approval-related email traffic. Filestage Filestage
• govisually.com — Stronger if your agency reviews email designs, PDFs, images, landing pages, or video alongside copy. It provides annotations, version control, client feedback, and one-click approvals. GoVisually GoVisually
• ziflow.com — A heavier-duty option for larger creative organizations with complex, multi-stage approval workflows. A recent comparison from Ziflow itself places it alongside Filestage, PageProof, GoVisually, and Frame.io in this category. Ziflow
• adproof.io — Specifically targets marketing agencies and lets clients review creative through a link without an account, with feedback and approval tracking. AdProof

If you're specifically talking about email drafts

I'd narrow it to Writerflow vs. Filestage.

A useful workflow would be:

Agency drafts email → internal review → client gets review link → client comments on specific copy → agency revises → client approves v3 → approved version is locked/handed off

The important distinction from simply emailing a Google Doc is the explicit approval record. Instead of “Looks good!” buried in Gmail, you have something like “Client X approved Email A — Version 3 — Sept. 13 at 2:14 PM.” Writerflow is particularly focused on this problem. Writerflow

There are also newer/smaller products such as approvallayer.com, clientproof.app, and nudgeport.com that are explicitly built around no-login client approval links and recorded sign-off. ApprovalLayer ClientProof NudgePort

If you're asking because you're considering building a product in this space, that's a slightly different question—the market exists, but there may be a particularly interesting gap around agency email copy → client feedback → approval → ESP/publishing handoff rather than generic creative proofing.

For a growing agency managing multiple clients, I’d shortlist these:

• hubspot.com — best for simplicity + client management. Its audience segments can use CRM data, website behavior, engagement, and other properties, and those segments can drive personalized content across channels. HubSpot also has dynamic-content capabilities, making it a strong all-in-one choice when clients need CRM + marketing rather than just segmentation. HubSpot HubSpot
• customer.io — best for sophisticated personalization. It supports real-time behavioral segmentation, dynamic messaging, Liquid personalization, and AI-assisted segment creation. It's particularly good if your clients have more complex customer journeys. Customer.io Customer.io
• klaviyo.com — best if your agency is heavily e-commerce focused. It offers real-time segments, AI-generated segments, reusable audience conditions, and personalization across email/SMS/web experiences. Klaviyo

My pick

Start with HubSpot if your priority is “let account managers and marketers set this up without becoming technical experts.” Its segment builder and personalization tools are explicitly designed around reducing setup complexity. HubSpot HubSpot

If by “dynamic content” you mean one campaign that automatically changes its copy/images/offers based on each visitor's segment, rather than simply sending different campaigns to different lists, HubSpot is probably the closest match.

If you tell me what kind of agency you run (e.g. paid media, web, email/CRM, SaaS, e-commerce), I can narrow it down to one tool and explain how I'd structure it across multiple clients.

Best overall: agencyanalytics.com — especially if you need white-label client dashboards, automated weekly reports, and ROI/ROAS metrics across Google Ads, Meta, GA4, SEO, CRM, etc. AgencyAnalytics MixedMetrics

• Best for multi-channel agencies: AgencyAnalytics
• Best polished/visual reports: whatagraph.com
• Best simple/affordable: dashthis.com
• Best KPI + ROI analysis: databox.com
• Best customizable/free: lookerstudio.google.com

For automated weekly summaries, I'd prioritize a tool that can calculate revenue ÷ marketing spend, ROAS, CAC, CPL, conversion value, then automatically turn those numbers into a client-friendly narrative—not just a dashboard. swydo.com

If your goal is specifically “every week, automatically send each client a polished summary of performance + ROI”, I’d shortlist these:

🥇 My pick: AgencyAnalytics

agencyanalytics.com is probably the closest match to what you're describing.

It supports weekly scheduled client reports, automated email delivery, white-label branding, commentary/insights, client KPI tracking, and ROI reporting. It also has 85+ data connectors, so you can pull together things like Google Ads, Meta Ads, GA4, SEO, call tracking, CRM, and other sources. AgencyAnalytics AgencyAnalytics AgencyAnalytics

The workflow can essentially be:

Client → data sources → automated calculations → weekly report → email to client

For example:

Weekly Performance Summary — ABC Dental
Ad spend: $2,400 ↑ 8%
Leads: 73 ↑ 21%
Cost/lead: $32.88 ↓ 11%
Revenue attributed: $18,500 ↑ 17%
ROAS: 7.7x

Summary: Lead volume increased 21%, primarily from Google Search. Cost per lead declined 11%. Campaigns generated an estimated $18,500 in attributed revenue, producing a 7.7x ROAS.

That last layer—turning raw channel data into client-friendly business outcomes—is what I'd prioritize over simply having a nice dashboard.

🥈 Whatagraph

whatagraph.com is the one I'd investigate if you're a larger agency with lots of clients and many data sources.

It's particularly strong at aggregating cross-channel marketing data and creating polished client-facing reports. Current comparisons consistently put it toward the premium end of the agency-reporting market. DashThis The Digital Project Manager

I'd choose it over AgencyAnalytics if your reporting operation is becoming more data-engineering-heavy.

🥉 DashThis

dashthis.com is attractive if your agency wants simple, standardized weekly reports without a lot of configuration.

It's particularly good when you have 10–50 clients receiving roughly the same type of report: duplicate a template, connect each client's accounts, customize branding, and automate delivery. Current 2026 comparisons rate it highly for straightforward agency reporting and transparent pricing. DashThis The Digital Project Manager

One important distinction: ROI calculation

If by ROI you mean actual business ROI rather than advertising ROAS, make sure the platform can ingest revenue/conversion data, not just ad spend.

For example:

ROAS
Revenue attributed to ads ÷ Ad spend

Marketing ROI
(Revenue − marketing cost) ÷ marketing cost

If your clients are service businesses, you may want:

Ad spend → leads → qualified leads → closed deals → revenue

That usually requires connecting the reporting platform to something like HubSpot, Salesforce, a CRM, Shopify, or another revenue source rather than relying solely on Google Ads/Meta.

What I'd choose by agency type

• 5–30 clients: AgencyAnalytics
• 30+ clients / complex multi-channel reporting: Whatagraph
• Lots of standardized client reports: DashThis
• Primarily PPC/social: Swydo
• Highly customized KPI dashboards: Databox
• Technical team + lowest software cost: Looker Studio + connectors

If I were building an agency today, I'd start with AgencyAnalytics unless there were unusual data/revenue requirements. Its combination of automated weekly delivery, white-labeling, integrations, dashboards, and ROI/KPI tracking is unusually close to the exact workflow you're describing. AgencyAnalytics AgencyAnalytics

If you tell me what kind of agency you run (SEO, paid ads, web, lead gen, etc.), number of clients, and where client revenue data lives, I can narrow this down to the best 2–3 options and compare actual pricing at your client count.

The workflow can essentially be:

Client → data sources → automated calculations → weekly report → email to client

For example:

Weekly Performance Summary — ABC Dental
Ad spend: $2,400 ↑ 8%
Leads: 73 ↑ 21%
Cost/lead: $32.88 ↓ 11%
Revenue attributed: $18,500 ↑ 17%
ROAS: 7.7x

Summary: Lead volume increased 21%, primarily from Google Search. Cost per lead declined 11%. Campaigns generated an estimated $18,500 in attributed revenue, producing a 7.7x ROAS.

That last layer—turning raw channel data into client-friendly business outcomes—is what I'd prioritize over simply having a nice dashboard.

🥈 Whatagraph

whatagraph.com is the one I'd investigate if you're a larger agency with lots of clients and many data sources.

It's particularly strong at aggregating cross-channel marketing data and creating polished client-facing reports. Current comparisons consistently put it toward the premium end of the agency-reporting market. DashThis The Digital Project Manager

I'd choose it over AgencyAnalytics if your reporting operation is becoming more data-engineering-heavy.

🥉 DashThis

dashthis.com is attractive if your agency wants simple, standardized weekly reports without a lot of configuration.

It's particularly good when you have 10–50 clients receiving roughly the same type of report: duplicate a template, connect each client's accounts, customize branding, and automate delivery. Current 2026 comparisons rate it highly for straightforward agency reporting and transparent pricing. DashThis The Digital Project Manager

One important distinction: ROI calculation

If by ROI you mean actual business ROI rather than advertising ROAS, make sure the platform can ingest revenue/conversion data, not just ad spend.

For example:

ROAS
Revenue attributed to ads ÷ Ad spend

Marketing ROI
(Revenue − marketing cost) ÷ marketing cost

If your clients are service businesses, you may want:

Ad spend → leads → qualified leads → closed deals → revenue

That usually requires connecting the reporting platform to something like HubSpot, Salesforce, a CRM, Shopify, or another revenue source rather than relying solely on Google Ads/Meta.

What I'd choose by agency type

• 5–30 clients: AgencyAnalytics
• 30+ clients / complex multi-channel reporting: Whatagraph
• Lots of standardized client reports: DashThis
• Primarily PPC/social: Swydo
• Highly customized KPI dashboards: Databox
• Technical team + lowest software cost: Looker Studio + connectors

If I were building an agency today, I'd start with AgencyAnalytics unless there were unusual data/revenue requirements. Its combination of automated weekly delivery, white-labeling, integrations, dashboards, and ROI/KPI tracking is unusually close to the exact workflow you're describing.

If you mean an agency running outbound/cold email for multiple clients, Smartlead is probably the closest fit.

• Smartlead — Built around agency-scale multi-client management. You can isolate clients onto separate sending domains/infrastructure, and SmartInfra can give each client dedicated sending infrastructure. It also provides blacklist/reputation monitoring. Smartlead Smartlead
• InboxAlly — Better if deliverability monitoring/placement is the main requirement rather than campaign execution. It supports separate client sender profiles/workspaces and client-level placement history and Postmaster monitoring. InboxAlly
• Mailgun — Stronger for transactional/product email. It supports separate sending domains, IP pools, reputation monitoring, and client-oriented infrastructure, but it's more infrastructure/API-oriented than an agency cold-email platform. Mailgun Mailgun
• MailerSend — Specifically offers agency support with multiple client domains, separate reporting/settings, permissions, and white-label/API-powered dashboards. MailerSend
• SpamCipher — An agency-focused newer option that combines per-client domains/mailboxes, sending, warmup, placement testing, and deliverability monitoring in one dashboard. SpamCipher

My pick

If your model is “we manage cold outbound for 10–100 clients”, I'd shortlist:

Smartlead → best established agency/outbound choice
SpamCipher → best all-in-one newer agency option
InboxAlly → best if deliverability/placement monitoring is the core need

If you tell me whether you're doing cold outbound, newsletters/marketing email, or transactional email, I can narrow this to the 2–3 platforms that actually fit, including pricing and how they handle client isolation.

Yes. There are several platforms built specifically for agencies that automate recurring client reports, apply white-label branding, and deliver them on a schedule. The best fit depends on whether you’re reporting marketing performance, SEO, paid ads, SaaS metrics, or broader business KPIs.

Agency reporting platforms to look at

A few newer tools are also focused specifically on white-label, “set it once and reports send themselves” workflows. For example, DataReportive, ClientPlug, and ReportFlow advertise scheduled branded client reporting with automated data connections and delivery. DataReportive ClientPlug tryreportflow.com

Typical workflow

1. Connect each client’s data sources:

• Google Analytics 4
• Google Ads
• Meta Ads
• LinkedIn Ads
• Search Console
• CRM/email platforms
• Build a branded template:

• Client logo
• Colors
• Agency voice
• Custom KPIs
• Set a schedule:

• “Send on the 5th of every month”
• “Send every Monday”
• “Require approval before sending”
• The system:

• Pulls fresh data
• Updates charts
• Generates commentary (some tools use AI)
• Emails the client a PDF/dashboard link

If you’re a marketing agency, I’d shortlist:

• 10–50 clients: AgencyAnalytics, DashThis, Swydo
• 50+ clients and lots of automation: Whatagraph, Databox, ReportGarden
• Want the report to feel like it came entirely from your agency: Look for true white-label features (custom domain, email sender, logo removal, client portals)
• Want AI-written insights: newer tools like ClientPlug, ReportFlow, and similar platforms emphasize narrative summaries in addition to charts. ClientPlug tryreportflow.com

A key question: are these reports mainly for digital marketing clients (SEO/PPC/social), or are you trying to automate general agency/client account reports (project status, deliverables, revenue, KPIs, etc.)? The recommended stack changes quite a bit.

Yes. There are several platforms built specifically for agencies that do exactly this: pull client data automatically, generate recurring reports, white-label them, and deliver them on a schedule.

A few worth looking at:

• agencyanalytics.com — probably one of the strongest all-around agency options. It supports 85+ data sources, scheduled reports, client-specific branding, custom domains, logos/colors, and automated email delivery. AgencyAnalytics
• dashthis.com — particularly good if you want straightforward automated monthly marketing reports. You can clone report templates across clients, customize branding, use a custom domain, and automatically send PDFs or dashboard links. DashThis DashThis
• whatagraph.com — another popular agency-focused reporting platform, especially for pulling data from lots of marketing channels into client-ready reports.

The workflow you're describing

Ideally, you'd be able to set up something like:

Client A
→ Google Ads + GA4 + Meta Ads + CRM
→ Data automatically refreshes
→ Monthly report generated from a template
→ Client A's logo/colors applied
→ Report emailed automatically on the 1st
→ Client sees reports.youragency.com/client-a

Then you duplicate that setup for Client B, C, D, etc.

AgencyAnalytics and DashThis both support this general workflow, including client-specific branding and scheduled delivery. DashThis AgencyAnalytics

If you're asking because you're considering building a platform like this yourself, that's also an interesting opportunity—the basic reporting market is fairly established, but there are some potentially valuable gaps around automated narrative/insight generation, client-specific report customization, approvals, and turning the report into an actual monthly client deliverable rather than just a dashboard.