Answers that do not mention MailerLite

If you’re managing email campaigns for multiple client accounts and want to avoid constant logins/logouts, look for an agency-focused email marketing platform with:

• A master dashboard for multiple client accounts
• Role-based access for your team and clients
• Client-specific reporting dashboards
• White-label reports (if you present results under your agency brand)
• Reusable templates and automation workflows

Some tools that fit this workflow:

A practical setup many agencies use:

1. Campaign platform: one of the tools above for sending and automation
2. Reporting layer: client dashboards or automated monthly reports
3. Client access: give clients view-only permissions where possible instead of sharing credentials
4. Templates: maintain a reusable library of approved layouts and workflows

If you manage 5–20 clients, I’d usually prioritize a tool with a true agency dashboard rather than just creating separate accounts under one email address. Zoho Campaign Monitor

The best choice depends mostly on your client mix:

• E-commerce clients: prioritize revenue attribution and integrations (often Klaviyo/ActiveCampaign-style workflows). BestSends
• Local businesses/service clients: prioritize easy reporting and client approvals.
• Large retainers: prioritize CRM integration, permissions, and white-label reporting.

If you tell me roughly how many client accounts you manage and whether they’re mostly e-commerce, B2B, or local businesses, I can narrow it down.

If you’re managing email campaigns for multiple clients, I’d separate the problem into two parts: campaign execution and cross-client reporting.

• ActiveCampaign — worth considering if you need to actually build automations, sequences, CRM workflows, and campaigns across multiple client accounts. Current agency-focused sources highlight its multi-account/partner tooling. BestSends
• AgencyAnalytics — particularly useful if the pain point is reporting. You can manage multiple clients from one account, connect email data sources including ActiveCampaign, schedule white-label reports, and create roll-up reports across clients. AgencyAnalytics Knowledge Base AgencyAnalytics Knowledge Base AgencyAnalytics Knowledge Base
• Campaign Monitor — another option if your main requirement is straightforward email campaign management across client brands; recent agency-focused comparisons specifically discuss its multi-client workflow. Hack'celeration

What I'd consider for your workflow

If you want one system to run the campaigns: look at ActiveCampaign.

If you already use different email platforms for each client and mainly want one dashboard/reporting layer: AgencyAnalytics is a better fit. It can aggregate data across clients and automate branded reports, so you don't have to repeatedly log into every client's platform just to pull numbers. AgencyAnalytics AgencyAnalytics

If you tell me how many clients you manage and whether these are newsletters, automated email/CRM campaigns, or cold outreach, I can narrow it down to the most suitable setup.

If your agency needs to run newsletters + automations + client-facing performance dashboards across multiple clients, I’d look at the market in two layers: the email execution platform and the agency reporting layer.

Shortlist

Recent 2026 agency comparisons consistently emphasize multi-account management, client isolation, automation depth, and branded reporting as the important differentiators. BestSends The Digital Project Manager

What I'd consider

gohighlevel.com
Probably the most natural fit if your agency wants one operating system per client: email, workflows, CRM, forms, funnels, SMS, reporting, etc. Its sub-account model and white-label capabilities are particularly relevant when you have many clients. Tool Decision Engine

activecampaign.com
A strong choice if the heart of your service is sophisticated lifecycle automation—welcome sequences, lead nurturing, segmentation, behavioral triggers, re-engagement, and CRM-connected journeys. Current agency comparisons specifically highlight its partner/multi-account capabilities and automation depth. BestSends ActiveCampaign

klaviyo.com
I'd look here if many of your clients are Shopify/ecommerce brands. Its strength is tying email/SMS automation and segmentation closely to customer and purchase behavior. Tool Decision Engine

campaignmonitor.com
Worth considering if your agency is primarily newsletter/campaign production rather than complex CRM automation. Its agency-oriented multi-client workflow is specifically called out in recent testing. Hack'celeration

brevo.com
Interesting when you have many smaller clients and need to keep software costs down. It supports email/SMS and automation without pushing you into the heavier CRM ecosystem. BestSends

The dashboard question is important

If by "performance dashboards" you mean a single agency portal where each client can log in and see email results alongside Google Ads, Meta, SEO, etc., I wouldn't necessarily make the email platform do that.

A setup such as:

Email platform → reporting connector → white-label agency dashboard

can be considerably cleaner. For example, AgencyAnalytics is specifically designed to pull email campaign performance into broader client reporting dashboards; it doesn't send the emails itself. US Tech Automations

My practical architecture

For an agency managing, say, 10–50 clients, I'd seriously consider:

• General SMB/B2B clients: ActiveCampaign or HighLevel
• Ecommerce clients: Klaviyo
• Client-facing reporting: AgencyAnalytics or another white-label reporting layer
• Your agency: standardized templates, automation recipes, UTM conventions, dashboards, and onboarding checklist

That avoids forcing every client into the same email platform when their underlying needs are different.

If you tell me roughly how many clients you manage, whether they're mostly B2B/ecommerce/local businesses, and whether clients need their own login, I can narrow this to 2–3 platforms and compare actual pricing, white-labeling, client isolation, automations, and reporting.

gohighlevel.com
Probably the most natural fit if your agency wants one operating system per client: email, workflows, CRM, forms, funnels, SMS, reporting, etc. Its sub-account model and white-label capabilities are particularly relevant when you have many clients. Tool Decision Engine

activecampaign.com
A strong choice if the heart of your service is sophisticated lifecycle automation—welcome sequences, lead nurturing, segmentation, behavioral triggers, re-engagement, and CRM-connected journeys. Current agency comparisons specifically highlight its partner/multi-account capabilities and automation depth. BestSends ActiveCampaign

klaviyo.com
I'd look here if many of your clients are Shopify/ecommerce brands. Its strength is tying email/SMS automation and segmentation closely to customer and purchase behavior. Tool Decision Engine

campaignmonitor.com
Worth considering if your agency is primarily newsletter/campaign production rather than complex CRM automation. Its agency-oriented multi-client workflow is specifically called out in recent testing. Hack'celeration

brevo.com
Interesting when you have many smaller clients and need to keep software costs down. It supports email/SMS and automation without pushing you into the heavier CRM ecosystem. BestSends

The dashboard question is important

If by "performance dashboards" you mean a single agency portal where each client can log in and see email results alongside Google Ads, Meta, SEO, etc., I wouldn't necessarily make the email platform do that.

A setup such as:

Email platform → reporting connector → white-label agency dashboard

can be considerably cleaner. For example, AgencyAnalytics is specifically designed to pull email campaign performance into broader client reporting dashboards; it doesn't send the emails itself.

My practical architecture

If you're running an agency with multiple client accounts, I’d separate the problem into two layers: email execution/automation and client-facing reporting. There isn't one platform that is equally strong at both.

My shortlist

Current agency-focused comparisons consistently highlight ActiveCampaign for automation/multi-account workflows, while AgencyAnalytics is specifically built around consolidating client reporting. US Tech Automations BestSends

What I'd actually build

For most agencies, I'd use:

ActiveCampaign + AgencyAnalytics

ActiveCampaign handles:

• Client newsletters
• Segmentation
• Welcome sequences
• Lead nurturing
• Behavioral automations
• Forms/lists
• Email performance

Then AgencyAnalytics becomes the client-facing reporting layer. It can pull email data alongside GA4, Google Ads, social, SEO, etc., and create branded/white-label dashboards and automated reports. AgencyAnalytics AgencyAnalytics

It also supports separate client dashboards, custom branding and agency-wide roll-up reporting, which is particularly useful once you're managing a meaningful number of accounts. AgencyAnalytics AgencyAnalytics

When I'd choose something else

HubSpot — If your clients need CRM + email + sales pipelines + marketing automation in one system. AgencyAnalytics can also pull HubSpot email metrics into client dashboards. AgencyAnalytics

Klaviyo — If most of your clients are ecommerce brands. I'd favor it when Shopify/customer behavior, product recommendations, revenue attribution and sophisticated ecommerce flows are central to the work.

Brevo — Worth considering if you're managing a large number of relatively small/local-business clients and keeping software costs tightly controlled.

Campaign Monitor — Particularly interesting if the agency's core service is newsletters rather than complex lifecycle automation. AgencyAnalytics can consolidate data from multiple Campaign Monitor accounts into centralized dashboards and provides white-label reporting. AgencyAnalytics

The key distinction

If by "centralize" you mean "I want one login where my team can manage 20 clients' email accounts", I'd lean toward ActiveCampaign/Campaign Monitor.

If you mean "I want one place where my team and clients can see every client's email + ads + website + SEO performance", I'd use AgencyAnalytics as the reporting hub, with the email platform underneath it.

If you tell me roughly how many clients you manage (e.g. 5, 20, 50+) and whether they're mostly B2B, local businesses, or ecommerce, I can narrow this down to a specific stack and estimate the monthly cost.

Yes. If you mean one agency account where you can manage multiple clients, with each client having its own brand templates, users/permissions, and ideally separate billing, there are a few platforms worth looking at.

Closest fits

Marq is particularly close to what you're describing. It supports centralized brand templates, groups/subgroups, role-based permissions, and even separate admin roles for billing, templates, approvals, etc. Marq Marq Marq Help Center

Frontify is more of a full brand-management platform. Its agency offering explicitly talks about managing multiple clients from one dashboard, with separate brand homes, guidelines, libraries and project spaces. It also supports separate portals and granular permissions. Frontify Frontify Frontify Knowledge Base

The interesting part is your billing-per-client requirement. That's where many otherwise-good platforms fall short. They tend to think in terms of one company's account with departments/groups, rather than:

Agency
→ Client A → users → templates → usage → $X/month
→ Client B → users → templates → usage → $Y/month
→ Client C → users → templates → usage → $Z/month

If that's specifically the business model you're trying to support, I would look beyond generic design tools and toward an agency-oriented white-label platform or potentially a custom SaaS layer on top of a design/template engine.

If you tell me what the clients actually create (social posts, flyers, ads, presentations, videos, proposals, etc.) and whether you want to resell the software under your agency's brand, I can narrow this down to the 3–5 platforms that fit the model best.

Yes. What you’re describing is usually called a multi-tenant agency platform, white-label platform, or client workspace platform. The ideal setup is:

• One agency admin account
• Separate workspace per client/brand
• Each client has its own:

• Brand templates (logos, colors, fonts, assets, layouts)
• Users and permissions
• Approval workflows
• Billing/subscription
• Usage tracking
• Data isolation
• Agency can switch between clients from one dashboard

A few platforms that fit parts of this model:

For more agency-as-a-SaaS models (where you want clients to feel like they’re logging into your product), look at white-label/multi-workspace tools:

• StackFill — built around agency templates, client workspaces, isolated templates, and per-client billing options. StackFill
• Vercid — focuses on branded client workspaces with custom branding, roles, and billing widgets. Vercid
• Agency Label — combines client management, reporting, invoicing, and white-label portals. Agency Label

If you’re building something closer to a creative production platform (think “each client has their own Canva-like environment”), I’d look for:

• Template inheritance: agency creates master templates → client gets controlled variants
• Field locking: clients can edit copy/images but not break layout
• Role hierarchy: agency admin → account manager → client editor → client approver
• Client billing isolation: each client can have their own Stripe/customer account
• Brand tokens: colors/fonts/assets stored per workspace
• Audit trail: who changed what and when

A common architecture is:

Agency Account
│
├── Client A Workspace
│   ├── Brand Kit
│   ├── Templates
│   ├── Users/Roles
│   └── Billing
│
├── Client B Workspace
│   ├── Brand Kit
│   ├── Templates
│   ├── Users/Roles
│   └── Billing

If you mean for a marketing/design agency, a franchise network, or a SaaS product you want to resell under your own brand, the best options differ quite a bit.

For email-performance reporting specifically, I’d shortlist these:

• agencyanalytics.com — strongest general-purpose choice. It has a dedicated email-marketing dashboard, supports data from Klaviyo, HubSpot, ActiveCampaign, and Mailchimp, and offers white-label dashboards, custom branding, client logins, custom domains, and automated reports. AgencyAnalytics AgencyAnalytics
• sendlytics.co — strongest email-focused option. It is specifically built around email reporting, with white-label dashboards, client/staff access, segment performance, annotations/goals, and daily/weekly/monthly campaign and flow monitoring. Sendlytics
• mailbreeze.com — worth considering if you also want email execution. It combines multi-client email management with white-label templates, custom domains, client-specific analytics, and automated branded PDF reports. MailBreeze
• zoho.com — better if you need highly customized BI. It supports branded client dashboards, custom domains, role-based access, data blending, and scheduled reports, so it's more flexible if email performance needs to sit alongside CRM, sales, or advertising data. Zoho

My pick

If your core requirement is “each client gets a polished dashboard showing their email campaigns/flows, completely under our agency brand”, I would start with AgencyAnalytics vs. Sendlytics.

The distinction is basically:

If you tell me which email platform(s) you use (Klaviyo, Mailchimp, HubSpot, etc.) and roughly how many clients you have, I can narrow this to the most suitable 2–3 systems and compare pricing/features.

If your focus is specifically email performance plus a polished agency/client experience, I’d start with AgencyAnalytics.

• White-labeling: custom logo, colors, domain, and branded report emails are supported on applicable plans. AgencyAnalytics
• Email-specific dashboards: it has a dedicated email marketing dashboard that can consolidate metrics from platforms such as Klaviyo, HubSpot, ActiveCampaign, and Mailchimp. AgencyAnalytics
• Custom client views: you can tailor dashboards around the KPIs your clients care about—opens, clicks, conversions, engagement by segment, bounce trends, etc. AgencyAnalytics
• Broader agency reporting: useful if you eventually want to combine email with paid media, SEO, analytics, or other channels rather than maintaining a separate reporting system. AgencyAnalytics

agencyanalytics.com

Alternatives worth considering

• Zoho Analytics — stronger if you want highly customized dashboards, data blending, role-based client access, and automated reports. It supports white-label dashboards with agency branding and custom domains. Zoho
• DataLion — worth looking at if sophisticated, interactive dashboards and per-client branding are more important than having a turnkey email-reporting template. DataLion
• DataReportive — more focused on automated white-label agency reporting, including live client dashboards and per-client permissions. DataReportive

My practical shortlist: AgencyAnalytics for the easiest agency-ready solution; Zoho Analytics if you need deeper customization/data modeling.

If you tell me which email platform you use (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, etc.) and roughly how many clients you have, I can narrow this to the best 2–3 options and compare pricing/features.

For an agency managing multiple ecommerce clients and needing both email + SMS from a centralized interface, I’d narrow it to Klaviyo vs. HighLevel, with the right choice depending on whether you're primarily an ecommerce retention agency or a broader marketing agency.

If you're an ecommerce-focused agency: Klaviyo

Klaviyo is probably the more natural fit if your clients are Shopify/DTC brands and your team is actually running email/SMS retention.

Klaviyo lets one login access and switch between multiple client accounts, with permissions that can differ by account. It also supports both email and SMS within those accounts. Klaviyo Help Center

The big advantage is that the platform is designed around ecommerce data—customers, products, orders, browsing behavior, abandoned carts, segmentation, flows, etc.

One caveat for agencies: Klaviyo's multi-account setup is more like "manage a portfolio of separate brands" than "one agency operating system." Shared billing is available in certain configurations, but has account-count limits. Klaviyo Help Center

If you want a true agency operating system: HighLevel

HighLevel is more explicitly designed around the agency model.

You get an Agency view → client sub-accounts, and those sub-accounts can independently handle email, SMS, automations, contacts, domains, etc. HighLevel also supports centralized management and bulk actions across client accounts. HighLevel Support Portal HighLevel Support Portal

It supports both bulk email and SMS from the same platform, and its agency plans support things like rebilling and SaaS configurations. HighLevel Support Portal HighLevel Support Portal

That makes HighLevel particularly interesting if your business model is:

Agency → 20/50/100 ecommerce clients → each client gets their own account → agency manages everything centrally → client gets charged monthly.

My practical distinction

I'd think about it this way:

• Shopify/DTC retention agency → Klaviyo
• Full-service marketing agency → HighLevel
• Agency wants to white-label/resell the software → HighLevel
• Agency primarily builds sophisticated ecommerce email/SMS flows → Klaviyo
• Agency wants one operational dashboard across lots of unrelated clients → HighLevel

If you tell me roughly how many clients you manage (e.g. 10, 50, 200+) and whether they're mostly Shopify, I can compare Klaviyo, HighLevel, Attentive, Yotpo, and Omnisend specifically for the agency model, including estimated cost structure and multi-client workflow.

Klaviyo is probably the more natural fit if your clients are Shopify/DTC brands and your team is actually running email/SMS retention.

Klaviyo lets one login access and switch between multiple client accounts, with permissions that can differ by account. It also supports both email and SMS within those accounts. Klaviyo Help Center

The big advantage is that the platform is designed around ecommerce data—customers, products, orders, browsing behavior, abandoned carts, segmentation, flows, etc.

One caveat for agencies: Klaviyo's multi-account setup is more like "manage a portfolio of separate brands" than "one agency operating system." Shared billing is available in certain configurations, but has account-count limits. Klaviyo Help Center

If you want a true agency operating system: HighLevel

HighLevel is more explicitly designed around the agency model.

You get an Agency view → client sub-accounts, and those sub-accounts can independently handle email, SMS, automations, contacts, domains, etc. HighLevel also supports centralized management and bulk actions across client accounts.

It supports both bulk email and SMS from the same platform, and its agency plans support things like rebilling and SaaS configurations.

That makes HighLevel particularly interesting if your business model is:

Agency → 20/50/100 ecommerce clients → each client gets their own account → agency manages everything centrally → client gets charged monthly.

My practical distinction

I'd think about it this way:

Klaviyo is probably the strongest fit for an ecommerce-focused agency. It supports multiple client accounts under one login, centralized portfolio management, and both email + SMS per client. Klaviyo Help Center Klaviyo Help Center Klaviyo Help Center

If you want white-labeling + CRM + broader agency operations, HighLevel is worth comparing; if you want deep ecommerce segmentation, flows, and revenue attribution, Klaviyo is more purpose-built. tooldecisionengine.com

Yes. For a small agency managing multiple client lists, audience segments, and split tests, you’ll usually want a platform with:

• Multi-client workspaces/subaccounts
• Segmentation rules (tags, behaviors, demographics, lifecycle stages)
• A/B testing (subject lines, content, offers, send times, landing pages)
• Reusable templates/workflows
• Client reporting and permissions

The best fit depends on whether you mean email/SMS lists or website conversion testing.

If you mean email marketing lists

activecampaign.com

Good all-around choice for a small agency:

• Strong segmentation and automation
• A/B testing inside campaigns and automations
• CRM + email together
• Good for managing different client journeys

Best for: agencies running lifecycle marketing, newsletters, nurture campaigns, and CRM automation.

campaignmonitor.com

Agency-focused:

• Client account management
• Permissions
• Reporting
• Templates and campaign workflows built around agency use cases Campaign Monitor

Best for: agencies that want a simpler client-friendly experience.

zoho.com

Worth considering if cost and multi-client organization matter:

• Agency edition supports managing multiple client accounts from one dashboard
• Includes segmentation, automation, and A/B testing capabilities Zoho

Best for: smaller agencies with many clients but modest complexity.

klaviyo.com

Best if clients are ecommerce brands:

• Very strong behavioral segmentation
• Product/customer-event based targeting
• Powerful experimentation

Best for: Shopify/DTC clients.

If you mean website conversion split testing

convert.com

Built specifically for agencies:

• Multiple client projects
• Centralized dashboard
• Permissions
• Experiment organization across accounts A/B Testing Software

Best for: CRO agencies testing landing pages, pricing pages, UX changes.

vwo.com

More enterprise-oriented:

• A/B testing
• Segmentation
• Personalization
• Experiment reporting

Best for: larger clients with traffic volume.

My shortlist for a small agency

A key question: are you trying to manage email/SMS audience lists (e.g., “send different offers to different customer groups”) or website experiments (e.g., “50% see landing page A, 50% see B”)? The ideal platform is quite different.

Yes. If by “manage segmentation and split testing across many client lists” you mean an agency needs to run campaigns for multiple clients without building a custom system, there are a few good fits.

My shortlist

ActiveCampaign is probably the first one I'd investigate for a small agency. Its Partner Portal is explicitly designed for agencies/resellers managing multiple client accounts, with an account dashboard and user management. ActiveCampaign Help Center ActiveCampaign Help Center

It also has unusually flexible testing: standard campaign split tests plus automation splits of 2–10 paths, including percentage-based splits and tests that can automatically determine a winning path. ActiveCampaign Help Center ActiveCampaign

activecampaign.com

When I'd choose the others

Klaviyo makes more sense if your clients are primarily e-commerce/DTC. You can manage multiple accounts under one login, organize accounts into groups, and use sophisticated behavioral segments. Klaviyo Help Center Klaviyo Help Center Its flow A/B testing can split audiences and compare different messages, timing, discounts, or entire branches. Klaviyo Help Center

klaviyo.com

Customer.io is attractive if your agency does more sophisticated lifecycle/behavioral marketing. Its segments can be based on characteristics and behaviors and used as triggers, filters, recipient lists, and conversion criteria. Separate workspaces keep each client's people, automations, and metrics isolated. Customer.io Customer.io

customer.io

One important distinction

If you're talking about something like:

“I have 30 client lists. I want to upload/manage them centrally, create reusable audience rules, randomly split each list 50/50, run different campaigns, and see aggregate results across clients.”

—that's a slightly different problem from ordinary email marketing. You may want an agency experimentation/segmentation layer rather than just an ESP.

If you tell me what channels you're testing (email, SMS, ads, etc.), roughly how many client lists/accounts you manage, and whether each client needs their data completely isolated, I can narrow this down to 2–3 platforms and explain the workflow I'd use for each.

For an agency managing multiple clients’ email work, I’d prioritize platforms with:

• Tenant/client isolation (Client A cannot see Client B’s lists, campaigns, mailboxes, analytics)
• Role-based access control (RBAC) (admin, strategist, editor, reviewer, client viewer, etc.)
• Approval workflows (draft → review → client approval → send)
• Audit logs (who changed/sent what)
• Separate sending identities/domains per client where needed

The best fit depends on whether you mean marketing email campaigns, shared inbox/customer email, or cold outbound. For a typical marketing/growth agency, I’d shortlist:

My general recommendation by agency size:

• Small agency (5–20 clients): Campaign Monitor or Zoho Campaigns. You’ll get mature email tooling without building an elaborate permission model. Campaign Monitor Zoho
• Larger agency (20+ clients, many staff): Look for a true workspace model like Mailers.io/EonMailer-style architecture, where every client has a separate environment and your team is granted only the required access. Mailers.io help.eonmailer.com
• High-compliance clients: Prefer platforms with audit trails, SSO options, and strict workspace separation.

A permission model I’d aim for:

• Agency Owner/Admin: all clients, billing, integrations
• Account Manager: assigned clients only
• Email Strategist: create/edit campaigns, no billing
• Copywriter: edit drafts only
• Client Reviewer: approve/reject, view reports
• Client Viewer: analytics only

One thing I would avoid: a single shared login per client or giving every employee full access to every client account. It makes offboarding, mistakes, and client confidentiality much harder.

If you tell me whether this is for marketing campaigns (Mailchimp-style), cold email outreach, or managing client inboxes, plus roughly how many clients/users you have, I can narrow this to 2–3 platforms.

For an agency managing email for multiple clients, I’d put front.com at the top of the shortlist.

The key reason is that Front’s permission model maps unusually well to an agency structure: client → workspace → inbox → team/user permissions. You can give different teammates access to different workspaces and inboxes, with different roles and permissions. Front Help Center Front Help Center

How I’d compare the main options

Front: You can create separate workspaces for clients or groups of clients, assign teammates to specific workspaces, and then restrict individual inboxes to particular users. Its newer permissions system also supports teammate groups for consistently granting workspace, inbox, and other permissions. Front Help Center Front Help Center Front Help Center

Missive: Particularly attractive if your agency wants email to remain the center of the workflow. It supports team spaces, shared inboxes, assignments, observers, and collaboration directly inside conversations. Missive Missive

Hiver: Worth considering if everyone already lives in Gmail. Its current product includes granular Shared Inbox roles, including an Inbox Admin who can manage a specific inbox without getting full administrative access. Hiver Updates Hiver Help

The architecture I'd use in Front

For example:

AGENCY
│
├── Client A Workspace
│   ├── support@client-a.com
│   ├── marketing@client-a.com
│   └── billing@client-a.com
│
├── Client B Workspace
│   ├── support@client-b.com
│   └── sales@client-b.com
│
└── Client C Workspace
    ├── support@client-c.com
    └── operations@client-c.com

Then create groups such as:

• Client A Team → access only to Client A
• Client B Team → access only to Client B
• Agency Leadership → access across selected/all clients
• Contractors → only the specific inboxes they need
• Account Managers → client workspace access without broader company administration

That last distinction is important: Front allows workspace roles/permissions to be separated from company-level administration, so someone can manage a client's workflow without automatically getting control over the entire agency environment. Front Help Center Front Help Center

One caveat: Front's workspaces aren't complete data silos. Front specifically notes that some contact/account information can remain visible across workspaces. So if by "per-client access" you mean hard tenant isolation where Client A's data can never be exposed to Client B's users, I'd evaluate the architecture more carefully rather than assuming a workspace equals a security boundary. Front Help Center

If you tell me roughly how many clients, users, and inboxes you have (e.g. 30 clients / 15 staff / 100 mailboxes), I can compare Front vs Missive vs Hiver vs Zendesk specifically for that agency setup, including where each permission model breaks down.

Hiver: Worth considering if everyone already lives in Gmail. Its current product includes granular Shared Inbox roles, including an Inbox Admin who can manage a specific inbox without getting full administrative access. updates.hiverhq.com help.hiverhq.com

The architecture I'd use in Front

For example:

AGENCY
│
├── Client A Workspace
│   ├── support@client-a.com
│   ├── marketing@client-a.com
│   └── billing@client-a.com
│
├── Client B Workspace
│   ├── support@client-b.com
│   └── sales@client-b.com
│
└── Client C Workspace
    ├── support@client-c.com
    └── operations@client-c.com

If your goal is one agency-level system where you can centrally manage clients and charge them for usage (email sends, SMS/phone credits) plus your own recurring services, the strongest fits I’d look at are:

1. HighLevel — closest match

gohighlevel.com is probably the most directly aligned if usage-based communication charges are a core part of your agency model.

HighLevel has an agency wallet for usage-based services and supports rebilling phone/SMS and email usage to sub-accounts. You can apply markups to usage rather than simply passing through your cost. HighLevel Support Portal HighLevel Support Portal

Its SaaS functionality also lets you create client plans, attach usage/credits, automate sub-account creation, and connect Stripe for client payments. GoHighLevel

The particularly relevant pieces for you are:

• Client pays your agency.
• Your agency maintains the underlying HighLevel account.
• SMS/phone usage can be rebilled.
• Email usage can be rebilled.
• You can add your own recurring agency fee.
• You can sell/resell additional products.
• Usage can be marked up.
• Billing is managed across sub-accounts.
• You can make the whole thing appear as your agency's software/service offering.

HighLevel's current documentation specifically describes phone/SMS/email usage as consumption-based services that can be deducted from the agency wallet or rebilled to clients. HighLevel Support Portal

For email specifically, HighLevel currently supports email rebilling on its higher agency plans, with markup functionality depending on the plan. HighLevel Support Portal

If your business model is:

"$X/month + $Y per 1,000 emails + $Z per SMS + setup/management fees"

I'd put HighLevel at the top of the shortlist.

2. Vendasta — better if you're building a broader agency marketplace

vendasta.com takes a somewhat different approach.

It's particularly strong if you want to maintain a catalog of services, package them, sell them to different clients, and have Vendasta handle the subscription/invoice/payment side.

Vendasta supports:

• Recurring client subscriptions
• One-time charges
• Custom invoices
• Setup fees
• Taxes
• Your own products/services
• Third-party products/services
• White-label client storefronts
• Centralized client billing
• Stripe-based payments Vendasta Vendasta

Its subscription model explicitly separates your wholesale cost from the retail subscription you charge the client, which is useful for an agency/reseller model. Vendasta Support

So Vendasta is attractive if your billing looks more like:

Client A
$500 website
$300 SEO
$200 reputation management
$150 advertising management
$75 SMS package
Total: $1,225/month

rather than primarily:

$X per SMS
$Y per email
$Z per phone minute

The important distinction

I'd think about the choice this way:

If communication usage is the product → HighLevel.

If a portfolio of agency services/products is the product → Vendasta.

If you want to build your own billing infrastructure → Stripe + your own application.

HighLevel is unusually well suited to the "agency pays wholesale usage, then automatically rebills the client with a markup" model. Its documentation explicitly describes this as rebilling. HighLevel Support Portal

Vendasta is stronger as a centralized agency commerce/marketplace system, where you can combine products and services into client subscriptions and invoices. Vendasta Vendasta Support

One caveat

If by "sends" you mean email/SMS usage from several different underlying providers, rather than just the platform's native messaging infrastructure, the decision changes considerably. HighLevel's native rebilling is tightly connected to its own services.

If you tell me what you're currently using for email (e.g. SendGrid/Mailgun/SES), SMS (Twilio/etc.), and client invoicing (Stripe/QuickBooks/etc.), I can map out the best architecture and compare HighLevel vs Vendasta vs Stripe + Chargebee/Orb/Metronome specifically for usage-based agency billing.

If by agency-friendly billing you mean one agency account pays the underlying costs, while clients can be charged centrally for SMS, email sends/credits, and your own services, there are a few distinct models.

The strongest fit: HighLevel

HighLevel is unusually purpose-built around this model. Its agency plans support client sub-accounts, an agency-level wallet, usage-based rebilling, markups, and SaaS subscriptions. Its current documentation specifically covers rebilling SMS/phone, email, AI, and other usage-based services. HighLevel Support Portal HighLevel Support Portal

You can essentially structure it as:

Client → pays your agency → agency pays HighLevel/communication provider → usage is attributed to the client

For example, you could charge:

• $199/month platform/service fee
• $0.XX per SMS
• $X per 1,000 email sends
• $XX for additional services
• Your desired markup on usage

HighLevel's SaaS Wallet can also charge a client's card for prepaid credits, with credits deducted as messages/emails/calls are consumed. HighLevel Support Portal

Its current pricing page says the $497/month Agency Pro plan includes SaaS Mode, which is specifically designed to sell subscriptions and automatically rebill SMS, email usage and other features. GoHighLevel

gohighlevel.com
help.gohighlevel.com

Other platforms

The important distinction is that Vendasta is more oriented toward an agency building a catalog/marketplace of third-party services, whereas HighLevel is more naturally suited to an agency operating the marketing infrastructure itself and charging clients for consumption. CRM Reviews Stack Space Solutions

If you're building an agency billing stack

I'd separate the requirements into three layers:

1. Recurring services

• $500/mo marketing management
• $99/mo website hosting
• $299/mo SEO
• etc.

2. Consumption

• SMS credits
• Email sends
• Voice minutes
• AI usage
• WhatsApp messages

3. One-off services

• Campaign setup
• Landing-page build
• Creative production
• Consulting
• Migration/setup fees

HighLevel can handle the first two particularly well, and its newer Marketplace usage-based pricing can also support per-execution, per-message, and custom usage charges. HighLevel Support Portal

So if your goal is essentially "Stripe + client accounts + CRM + SMS/email infrastructure + metered usage + agency markup in one system," HighLevel is probably the first platform I'd investigate.

One caveat: the exact billing mechanics differ by communication provider and plan. For example, HighLevel's current documentation distinguishes LeadConnector/LC Email from providers such as Mailgun, and some rebilling functionality is plan-dependent. HighLevel Support Portal

If you tell me how you want to charge clients (e.g. prepaid SMS credits vs. monthly invoice, your desired markup, and whether you're already using Twilio/SendGrid/Mailgun), I can map out 3–5 concrete stacks and show exactly how the money flows from client → agency → provider.

If by “lifecycle campaigns” you mean onboarding, activation, trial conversion, retention, win-back, etc., and the agency needs to run those campaigns separately for many clients while comparing performance across clients, I’d look at the tools in this order:

For your specific use case

Iterable is particularly interesting. Its documentation explicitly says agencies can use separate Projects for multiple clients, with each project having its own users, lists, campaigns, and data. support.iterable.com

Braze is the heavier-duty alternative. It supports multiple workspaces and, as of 2026, has added cross-workspace capabilities for moving reusable campaign assets and querying engagement data—useful if your agency wants to standardize winning lifecycle programs across clients. www.braze.com

Customer.io is attractive if your agency is more technical and wants event-driven lifecycle automation. Multiple workspaces can live under one account, with workspace-level users, data, messages, and integrations. docs.customer.io

If you're primarily doing lead nurturing for SMB/local-business clients rather than product lifecycle, the answer changes substantially: GoHighLevel becomes much more relevant because its agency model is built around client subaccounts and white-labeling. orometa.com

The feature I'd prioritize

Don't just look for “multi-account.” For an agency, I'd specifically require:

1. Isolated client workspaces — no possibility of cross-client audience contamination.
2. Reusable campaign templates — build “trial onboarding v3” once, deploy it to multiple clients.
3. Experiment/version tracking — A/B tests and campaign versions need to be comparable.
4. Normalized reporting — e.g. activation rate, conversion rate, revenue/user, retention—not merely opens/clicks.
5. Cross-client dashboarding — compare the same lifecycle stage across accounts.
6. Client permissions — clients see their workspace without seeing other clients.
7. Easy cloning/export — crucial when you discover a campaign pattern that works across accounts.
8. Per-client sending infrastructure — separate domains/senders and reputation.

If you tell me what kind of clients you have (SaaS, ecommerce, B2B, local businesses, etc.), approximate number of clients, and whether you need email only or email + SMS/push/in-app, I can narrow this to a 2–3 tool shortlist and compare the actual workflow for running the same lifecycle experiment across 10+ clients.

For an agency that needs to run, clone, test, and compare automated lifecycle campaigns across multiple clients, the best tool depends on whether you mean email/SMS lifecycle marketing, full CRM journeys, or agency operations. The shortlist looks like this: AiMarketer Tekpon

My practical picks by agency model

• 10–100 SMB clients (especially local businesses): GoHighLevel is usually the most agency-native because of sub-accounts and white-label capabilities. Tekpon
• B2B lifecycle agency managing complex nurture programs: HubSpot or ActiveCampaign. US Tech Automations
• Ecommerce retention agency: Klaviyo.
• SaaS/product lifecycle consulting: Customer.io.
• Agency running many experiments and comparing performance: pair a campaign platform with a reporting/analytics layer rather than expecting one tool to do everything. SlickText

For your specific phrase — “run and compare automated lifecycle campaigns for several clients at once” — I’d prioritize these features:

1. Client/account separation (no risk of data mixing)
2. Reusable campaign templates (clone journeys across clients)
3. A/B testing and holdouts
4. Cross-client reporting dashboards
5. Approval workflows before sends
6. Event-level analytics (not just opens/clicks)

If you tell me:

• number of clients (5, 20, 100+),
• channels (email only vs email/SMS/push),
• client type (SaaS, ecommerce, local SMB, B2B),
• and whether clients need login access,

I can narrow it to a top 2–3 stack.

Yes. If your main requirement is “pull data from dozens of client accounts, aggregate it, and produce one weekly agency-level export,” I’d look first at AgencyAnalytics and Databox.

• AgencyAnalytics — particularly suited to agency portfolios. Its Roll-up Reports can combine selected clients into one report, with support for up to 50 clients per roll-up report. It also has a Roll-up Table for cross-client metrics and scheduled reporting. AgencyAnalytics AgencyAnalytics AgencyAnalytics
• Databox — worth considering if you want more analytics/benchmarking and less of a traditional “client report” workflow. It is built around connecting multiple client data sources and automating recurring analysis and reporting. Databox
• Whatagraph — another agency-oriented option, especially if you need data blending and polished scheduled reports. Current comparisons list it with 50+ integrations and report scheduling. Databox
• Supermetrics + Sheets/Looker Studio — better if by “export” you literally mean a CSV/Google Sheet containing one row per client each week, rather than a presentation-style report. It gives you more control over the data model, but requires more setup.

For your specific use case

If I were designing the workflow, I'd distinguish between:

A. One weekly executive report

Client A | Spend | Leads | Revenue | ROAS
Client B | Spend | Leads | Revenue | ROAS
…
Client 40 | Spend | Leads | Revenue | ROAS

→ AgencyAnalytics Roll-up or Databox is probably the simplest approach.

B. A machine-readable weekly export

client_id, week, spend, impressions, clicks, leads, revenue, ...

→ I'd lean toward Supermetrics or another data-pipeline tool feeding Sheets/BigQuery, because you retain control over the schema and can subsequently feed the data into whatever reporting layer you want.

The important question is what “export” means for you. If you tell me your sources (e.g. Google Ads + Meta + GA4 + HubSpot), roughly how many client accounts, and whether the weekly output needs to be CSV/Sheets vs. PDF/dashboard, I can narrow this to 2–3 platforms and explain the tradeoffs.

Yes. If you mean “connect dozens of client ad/analytics accounts, normalize the metrics, and produce one agency-wide weekly export”, there are a few platforms specifically suited to that workflow.

My shortlist

• agencyanalytics.com — particularly interesting if the key requirement is cross-client roll-up reporting. It supports 85+ integrations, scheduled reports, templates, and specifically has Roll-up Reports & Dashboards that aggregate metrics across multiple clients. AgencyAnalytics AgencyAnalytics
• databox.com — better suited if you want a more analytical agency dashboard/data warehouse-ish layer, with KPI tracking and data-source-based scaling rather than purely client-based reporting. Databox
• whatagraph.com — worth looking at if the weekly output needs to be particularly polished/visual and you're blending lots of channels. It is designed around multi-source agency reporting. Anomaly AI Basedash
• dashthis.com — simpler if you're primarily trying to automate standardized reports rather than build a sophisticated agency-wide analytics layer. DashThis
• lookerstudio.google.com — potentially the cheapest/flexible route, especially if most of your data is Google Ads + GA4, but you'll generally need connector infrastructure for Meta, LinkedIn, TikTok, etc. MixedMetrics

For your specific use case

I'd pay particular attention to AgencyAnalytics if the workflow is something like:

40 clients → 100+ advertising/analytics accounts → automatically pull last week's data → consolidate into one agency-level table → export every Monday.

Its roll-up functionality is explicitly designed to aggregate metrics across clients and can produce an agency-wide view without manually stitching spreadsheets together. AgencyAnalytics

The important distinction, though, is “one export containing all clients” vs. “one report per client.” A lot of agency-reporting software is optimized for the latter. If your actual goal is something like:

then I'd evaluate the platforms primarily on portfolio/roll-up capabilities, API/export options, account isolation, and how pricing scales with number of connected accounts rather than on their client-facing PDF reports.

If you tell me which platforms you're pulling from (Google Ads, Meta, TikTok, GA4, HubSpot, Shopify, etc.) and roughly how many clients/accounts, I can narrow this to 2–3 options and compare the actual workflow and pricing.

If your main requirement is “build a modular email once, then reuse it across multiple client accounts/brands,” I’d look first at these:

• stripo.email — particularly strong for agencies. It supports reusable content modules, separate brand/design systems for each client, folders/projects, roles, and exports to 90+ integrations. Stripo.email Stripo.email
• beefree.io — excellent if you want a centralized agency workspace. You can create reusable blocks/templates and copy templates between client brands while keeping each client's branding organized separately. Beefree Beefree
• campaignmonitor.com — better if you want the email sending/automation platform itself to manage client accounts, rather than primarily a design system. It supports separate client accounts, templates, permissions, white-labeling, and locked template sections. Campaign Monitor
• omnisend.com — worth considering for ecommerce agencies. Its Partner Portal lets agencies create templated accounts and copy email templates, campaigns, forms, and certain automations into client stores. Omnisend Help Center

My quick take

If you're describing something like:

Agency builds a master library → reusable header/hero/CTA/product modules → select client → apply their branding → assemble campaign → export/send

then Stripo or RGE Studio are probably the closest fit.

If you tell me whether you need (1) just the design/template system, (2) sending + automation too, or (3) a white-label platform your clients can log into, I can narrow it down to 2–3 options and compare them on cross-client template sharing, locked modules, brand management, approvals, and pricing.

For an agency managing multiple client accounts, the two strongest fits are Stripo and Beefree (now RGE Studio).

• Stripo — particularly strong if your priority is reusable modules + moving/copying templates between client projects/accounts. It supports reusable content blocks, separate design systems for each client, folders/projects, and template sharing across projects and organizations. Stripo.email Stripo Help Center

stripo.email

• Beefree / RGE Studio — particularly strong if you want a central agency workspace with separate client workspaces. It supports reusable content blocks/templates, client-specific brand settings, and—on Enterprise—separate workspaces that can each connect to a different client's ESP account. Beefree Beefree Support

beefree.io

• Dyspatch — worth considering if you need a more sophisticated modular design system with locked/guardrailed components. Modules can be reused across templates and permissions can prevent users from altering things like logos or footers. Dyspatch

dyspatch.io

If your exact use case is: “We build a library of reusable agency modules once, then deploy variations of those templates across dozens of client accounts”, I'd look at Stripo first, with Beefree/RGE Studio as the other major option.

If you tell me whether your clients use HubSpot, Klaviyo, Salesforce, Mailchimp, ActiveCampaign, etc., I can compare the best options specifically for that workflow.

For an agency building custom API integrations for multiple clients, I’d look closely at Nango.

nango.dev

Why it fits an agency model

• Multi-tenant: You can maintain separate connections and credentials for each client/customer. Nango explicitly supports organization- and user-level connections. Nango Docs Nango
• API access, not just no-code automation: Your application can make authenticated requests through Nango's proxy, while Nango handles credentials, token refresh, retries, rate limits, etc. Nango
• Large integration catalog: It currently advertises 1,000+ APIs, including Salesforce, HubSpot, Slack, Google, Microsoft, Shopify, NetSuite, Workday, and others. Nango
• Custom integrations: You're not restricted to their prebuilt connectors—you can write integration logic in TypeScript and deploy it through their runtime. Nango
• White-label/client-facing auth: You can embed or customize the authorization UI so your clients don't necessarily need to interact with Nango directly. Nango
• Self-hosting: If an agency client has unusual security or deployment requirements, Nango supports self-hosting. Nango

How I'd structure it

For example, if your agency has 20 clients:

Your Agency Platform
        │
        └── Nango
             ├── Client A
             │    ├── Salesforce connection
             │    └── Slack connection
             ├── Client B
             │    ├── HubSpot connection
             │    └── Google connection
             └── Client C
                  ├── Custom ERP API
                  └── Shopify connection

Your application owns the business logic and client experience, while Nango handles much of the painful integration plumbing.

Two alternatives worth evaluating

Prismatic is particularly interesting if your agency wants a more traditional embedded iPaaS/workflow-builder approach, including integrations that are bespoke to individual customers. Its connection model explicitly supports customer-, organization-, and user-level credentials. Prismatic Prismatic

Paragon is another option if you want heavily embedded, white-labeled integrations and customer-configurable workflows. Paragon Integration Infrastructure

My practical shortlist would be: Nango if your team is engineering/code-heavy; Prismatic if you want more visual integration/workflow tooling; Paragon if the embedded customer experience is the central concern.

If you tell me what kinds of APIs you integrate (CRM, accounting, healthcare, custom ERPs, etc.) and whether each client needs their own credentials, I can narrow this down and compare Nango vs Prismatic vs Paragon vs building it yourself around pricing, multi-tenancy, API limits, OAuth, and agency resale.

If your agency is building custom integrations for multiple clients, I’d look closely at Paragon first.

useparagon.com supports both prebuilt and custom connectors, API access to third-party endpoints, managed authentication, webhooks, embedded/white-labeled connection UX, and multi-tenant customer integrations. That combination is particularly relevant when each client may have a different collection of systems or require bespoke API logic. Paragon Integration Infrastructure Paragon Integration Infrastructure

How I'd compare the main options

Why Paragon stands out for an agency: you can build a reusable integration layer while still handling client-specific APIs. Its platform lets you create custom connectors for essentially any third-party API and expose API calls through its Connect API, while also handling authentication and connection UX. Paragon Integration Infrastructure

Merge is worth considering if your clients mostly need integrations in standardized categories such as Salesforce/CRM, HRIS, accounting, ATS, ticketing, or file storage. Its Unified API normalizes different vendors behind one API, and each end customer's connection is represented by an account token. Merge API Documentation Merge API Documentation

One important distinction: Paragon is more appropriate when "custom integration" is the core requirement; Merge is more compelling when "many integrations that fit common data models" is the requirement.

If you tell me what kinds of integrations your agency builds (e.g. Salesforce, Shopify, HubSpot, proprietary REST APIs, accounting systems, databases) and whether you need OAuth/token management + webhooks + white-labeling, I can narrow this down to 2–3 platforms and compare their API architecture and pricing.

For an agency managing many ecommerce clients, the best software is usually not a single ecommerce tool — it is an integration/orchestration platform that lets you build repeatable automations, isolate client environments, monitor failures, and reuse templates.

The strongest options are:

StackBriefly Endertech## My recommendation by agency model

1. You manage 5–100 ecommerce clients and sell automation as a service

Use Make + a client template system.

Example architecture:

Client Shopify store
→ New order trigger
→ Validate order data
→ Route based on rules
→ Update fulfillment system
→ Add customer to marketing segment
→ Notify Slack/Teams
→ Log errors in Airtable/DB
→ Send client report

Make works well here because agencies can duplicate scenarios, customize credentials per client, and visually maintain complex order flows. Hack'celeration

2. You want to build a "managed automation platform" for clients

Use n8n.

Good examples:

• Order routing engine
• AI customer support workflows
• Returns automation
• Inventory synchronization
• Multi-store reporting
• Custom API integrations

A typical setup:

• One n8n instance
• Separate client credentials/projects
• PostgreSQL database
• Error monitoring
• Reusable workflow templates

n8n is especially attractive if you have developers because you can add custom code and avoid per-operation pricing constraints. StackBriefly

3. Your clients are mostly small businesses that want quick wins

Use Zapier.

Great for:

• Shopify order → Slack alert
• Shopify customer → CRM
• New order → Google Sheet
• Refund → support ticket
• Review request automation

Its biggest advantage is simplicity and breadth of integrations. StackBriefly

Ecommerce-specific automation stack I would consider

For an agency, I would usually pair:

• Workflow engine: Make or n8n
• Client database/config: Airtable, Supabase, or PostgreSQL
• Monitoring: Sentry, Better Uptime, or similar
• Client reporting: Looker Studio, Metabase, or custom dashboards
• Documentation: Notion or Confluence
• Secrets management: 1Password Business, Vault, or platform credential storage

Important agency features to look for

Before choosing, make sure it supports:

• Multi-client credential separation
• Workflow cloning/templates
• Versioning
• Error retries
• Logs and replay
• Webhooks
• API calls
• Custom code steps
• Usage monitoring
• Client-specific billing attribution

A common mistake is building hundreds of one-off automations. A scalable agency usually builds 10–20 reusable automation templates and configures them per client.

If you are specifically doing Shopify/WooCommerce → fulfillment → CRM/email/support automations, I would lean Make for a non-dev agency and n8n for a technical automation agency. vortexiq.ai Hack'celeration

For an agency managing many ecommerce clients, you usually want something closer to an iPaaS (integration platform as a service) or automation orchestration layer rather than a simple Zapier-style tool. The key features are:

• Multi-client / multi-tenant management
• Reusable workflows and templates
• Shopify/WooCommerce/Amazon/marketplace connectors
• Order-event triggers (new order, paid, fulfilled, refunded, abandoned cart)
• Error monitoring and retries
• Logs you can show clients
• API/webhook support
• Permissions and client access

Good options:

My shortlist by agency type

1. You build Shopify/WooCommerce automations for many SMB clients

Choose:

• Make
• n8n
• SyncSpider

Typical workflows:

• Shopify order → Slack notification
• New order → CRM customer creation
• Paid order → fulfillment system
• Refund → accounting update
• Low inventory → alert client

2. You are becoming an ecommerce integration partner

Choose:

• Celigo
• Synchron.io
• DropStream

Better when clients have:

• ERP systems
• warehouses
• marketplaces
• multiple sales channels
• complicated fulfillment rules

3. You want to sell "automation as a service"

A common agency stack is:

• n8n (automation engine)
• Postgres/Supabase (client configs + logs)
• Retool/Appsmith (client dashboards)
• Slack/email alerts (incident handling)
• Webhook/API layer (custom integrations)

This gives you a branded platform rather than reselling another tool.

Things I would avoid for a serious agency

• Only using Zapier for everything: it becomes expensive and messy with dozens of clients.
• Building every integration from scratch: maintenance becomes the product.
• Running workflows without monitoring: failed orders are where clients lose trust.

If your agency is mainly Shopify + WooCommerce + marketplaces, I would compare n8n vs Make vs SyncSpider first. If it is more ERP/warehouse/order management, look at Celigo, Synchron.io, or DropStream. SyncSpider Synchron DropStream

I can also give you a recommended agency architecture for managing 50–500 ecommerce clients if that is the scale you are targeting.

Yes. There’s a fairly mature category for this: client approval / proofing software for agencies. The basic workflow is:

Draft → send client a review link → client comments on the exact draft → revisions → approve → keep an audit trail.

A few options worth looking at:

• filestage.io — Probably the closest fit if your agency handles emails alongside broader creative work. Clients can review documents, images, video, etc., leave contextual comments, and formally approve versions. It supports multi-step approval workflows and doesn't require clients to create accounts. Filestage Filestage
• writerflow.com — Particularly interesting if by “email drafts” you mean copywriting/content rather than designed email creatives. It keeps the brief, brand voice, draft versions, comments, and approval together, with clients reviewing through a link. Writerflow
• approvella.com — More of a lightweight agency client-approval portal: one branded link, client comments/revisions, sign-off, and an audit trail. Approvella
• approvalos.app — Built specifically around the agency approval loop: upload work, send a secure link, collect feedback/revisions, and get approval. ApprovalOS
• emailpilot.ai — More specifically positioned around marketing/email campaign approval, with a shared review space, comments, revision history, and approval tracking. EmailPilot

If you're specifically talking about email campaigns

There are actually two different problems these tools can solve:

1. Email copy approval — “Here's the subject line + body copy; client edits/comments/approves.”
2. Rendered email approval — “Here's exactly what the recipient will see on desktop/mobile; client comments on the actual design/render.”

If you're building or evaluating something for an agency, I'd pay particular attention to the second. A strong workflow would let the client open a link, see the actual rendered email, comment directly on sections, compare v1/v2, and click Approve or Request changes—without needing an account.

If that's the workflow you're envisioning, I can also map out the existing competitors specifically for email approval and show where there are gaps in the market.

Yes. A few platforms specifically streamline agency client review and approval:

• Writerflow — especially focused on written content/email drafts; clients can comment, request changes, or approve via a link, with approval tied to the exact version. Writerflow
• Filestage — broader creative proofing: comments, version control, reviewer workflows, reminders, and approvals. filestage.io filestage.io
• Ziflow — more enterprise-oriented, with automated multi-stage approvals and centralized feedback across creative assets. ziflow.com

For an agency primarily approving email copy, Writerflow is particularly aligned with that workflow.

For a growing agency managing multiple clients, I’d look closely at activecampaign.com.

Why it fits your use case:

• Dynamic segmentation: segments update automatically as contacts’ attributes and behavior change. ActiveCampaign Help Center ActiveCampaign
• Dynamic content: one email can show different copy, images, or sections based on tags, fields, behavior, location, and other criteria. ActiveCampaign Help Center ActiveCampaign
• Low-code setup: its segment builder is visual, and newer Active Intelligence features can turn a natural-language description into segment conditions. ActiveCampaign Help Center
• Agency-friendly personalization: ActiveCampaign specifically supports agency use cases, including predictive content for client campaigns on eligible plans. ActiveCampaign Help Center

Runner-up: HubSpot if your agency also wants a broader CRM/content platform. HubSpot has automatically updating active segments, and its personalized-content capabilities are available on higher-tier Marketing/Content Hub plans. HubSpot Knowledge Base HubSpot Knowledge Base

Simple rule:

• Choose ActiveCampaign if your priority is segmentation + automated personalization without a lot of complexity.
• Choose HubSpot if you want segmentation + CRM + broader marketing/content operations in one ecosystem.

If you tell me how many clients you manage and whether the dynamic content is mainly email, websites, or ads, I can narrow it to 2–3 tools and compare their agency pricing/setup.

For a growing agency, ActiveCampaign is a strong fit if the priority is audience segmentation + dynamic content without a lot of technical setup.

• Dynamic segments: audiences update automatically based on behavior, tags, fields, website activity, purchases, etc. ActiveCampaign Help Center ActiveCampaign
• Dynamic content: one email can show different copy, images, or blocks to different audience segments using conditional content. ActiveCampaign Help Center ActiveCampaign
• Agency-friendly: you can build reusable automations, tags, custom fields, and segments rather than rebuilding campaigns from scratch for every client. ActiveCampaign
• Low technical barrier: its visual builders and prebuilt automation recipes are designed to reduce manual workflow setup. ActiveCampaign

Another option: hubspot.com is worth considering if clients also need a broader CRM/content platform. Its Smart Content can dynamically vary website and email content based on things like lifecycle stage, list membership, location, referral source, and device. knowledge.hubspot.com

Rule of thumb:
ActiveCampaign → simpler, marketing-automation-first agency workflows.
HubSpot → broader CRM + marketing/content ecosystem, but potentially more platform than you need.

If you tell me how many clients/users you have and whether the dynamic content is mainly email, websites, or ads, I can narrow it to 2–3 tools and compare their agency pricing/setup.

For an agency whose main goal is automated weekly client summaries + credible ROI calculations, I’d shortlist these:

1. agencyanalytics.com

This is probably the most straightforward fit if you want “connect client accounts → create template → automatically send a weekly report.”

It supports 85+ marketing integrations, scheduled reports, white-label branding, client portals, custom metrics, goals and budget tracking. It can also blend paid, social, search and web data into cross-channel reporting. AgencyAnalytics AgencyAnalytics

Its AI tools can additionally generate summaries and surface trends, rather than just dumping KPI tables on the client. AgencyAnalytics

Particularly good for: PPC/SEO/social agencies managing lots of SMB clients.

2. whatagraph.com

Worth considering if your reports need to combine lots of different data sources and you want more sophisticated data transformations.

Whatagraph supports scheduled automated delivery, including weekly reporting, and lets you choose whether reports go out automatically or require agency review first. Whatagraph Help Center

Its current plans also include custom metrics/dimensions, cross-channel aggregation, goals and alerts; its AI can generate reports from prompts. Whatagraph Help Center Whatagraph Help Center

Particularly good for: larger/more sophisticated agencies where the reporting logic varies significantly between clients.

3. databox.com

Databox is interesting if you don't just want reporting, but want the system to help explain what changed and why.

Its agency product is built around recurring analysis and reporting, with AI-generated explanations and report drafts that the team can review before sending. Databox

Its current integration ecosystem also extends beyond advertising analytics into CRM, ecommerce, finance and databases, which can be useful for calculating actual business ROI rather than merely reporting ad-platform ROAS. Databox

Particularly good for: agencies that want weekly reports to contain interpretation, not just numbers.

4. supermetrics.com

I'd look at Supermetrics if ROI calculation is the hard part.

Rather than being primarily a client-reporting interface, it is more of a data infrastructure layer: it pulls data from many sources and can feed spreadsheets, BI tools or data warehouses. For paid media, it can combine ad spend, conversions, ROAS and onsite/CRM data. Supermetrics Supermetrics

That makes it particularly useful when your definition of ROI is something like:

Ad spend → leads → qualified leads → opportunities → closed revenue → profit

rather than simply:

Revenue ÷ ad spend = ROAS

What I'd choose based on your use case

If you're a typical digital marketing agency, I'd start with AgencyAnalytics.

If the differentiator you're selling clients is “every Monday you'll receive an automatically generated explanation of what happened, what it means, and the ROI we're generating”, I'd look particularly closely at Databox.

If you need custom revenue/ROI models pulling from CRM + ecommerce + ad platforms, I'd investigate Supermetrics or Whatagraph.

One important distinction: ROAS isn't the same as ROI. A good agency reporting setup should let you incorporate things like client revenue, gross margin, lead value, customer acquisition cost, or CRM revenue—not just the conversion value reported by Google/Meta.

If you tell me what kind of agency you run (PPC, SEO, full-service, lead gen, etc.) and the approximate number of clients, I can narrow this to 2–3 platforms and compare their current pricing, integrations, automation, white-labeling, and ROI capabilities.

If your agency’s main goal is automated weekly client summaries + credible ROI calculations, I’d focus on these platforms:

1. Databox — particularly suited to your use case

Databox is worth looking at first if ROI calculations are as important as report delivery.

It supports calculated metrics that can combine data sources and calculate things such as ROI, conversion rates, and custom KPIs. It also supports scheduled reports, client-specific templates, goals, and automated analysis. Databox Databox

A weekly client report could, for example, automatically show:

• Ad spend: $8,500
• Leads: 247
• Qualified leads: 83
• Revenue attributed: $42,000
• ROAS: 4.94×
• ROI: 394%
• Cost per qualified lead: $102
• Week-over-week change
• Automated explanation of what changed

That combination of data aggregation + calculations + narrative + scheduled delivery is the closest match to what you described.

2. AgencyAnalytics — excellent if you're primarily a marketing agency

AgencyAnalytics is more purpose-built around agency client reporting. It has 85+ integrations, white-labeled dashboards/reports, scheduled delivery, approval workflows, custom metrics, and KPI tracking. AgencyAnalytics AgencyAnalytics

I'd particularly consider it if your clients are mostly running Google Ads, Meta Ads, SEO, social, email, and web analytics and you want a polished client portal/report without building much yourself.

3. Whatagraph — strong for multi-channel reporting

Whatagraph is another good fit when an agency has lots of marketing channels and wants them consolidated into recurring reports. Its current Max plan specifically supports automated weekly/monthly client reporting, cross-channel aggregation, custom transformations, goals, alerts, and full custom branding. Whatagraph Help Center Whatagraph Help Center

My practical shortlist

If I were evaluating software specifically around "send every client a useful automated weekly performance + ROI report", I'd test:

1. Databox — if automated analysis and ROI calculations are central.
2. AgencyAnalytics — if client-facing marketing reports/portals are the priority.
3. Whatagraph — if you're aggregating lots of channels and data sources.
4. DashThis — if you want straightforward, attractive recurring reports without as much analytical complexity.
5. Looker Studio — if you want maximum customization and don't mind building/maintaining the reporting system yourself.

One important distinction: automating a report is not the same as automating a trustworthy ROI calculation. Before choosing, I'd test each platform with one real client and see whether it can correctly connect spend → leads/conversions → revenue, handle attribution assumptions, and calculate the exact ROI formula you use.

If you tell me what kind of agency you run (PPC, SEO, web, social, full-service, etc.), your approximate number of clients, and where client revenue data lives (CRM, Shopify, Stripe, spreadsheets, etc.), I can narrow this down to the most appropriate 2–3 options and explain the setup.

Whatagraph is another good fit when an agency has lots of marketing channels and wants them consolidated into recurring reports. Its current Max plan specifically supports automated weekly/monthly client reporting, cross-channel aggregation, custom transformations, goals, alerts, and full custom branding.

My practical shortlist

If you mean one agency account where each client can have its own sending domain/infrastructure plus separate deliverability visibility, there are several options:

• mailoptimal.com — built specifically for agencies. It offers isolated client workspaces, dedicated domains/mailboxes, independent warmup/reputation, and white-labeled reporting. MailOptimal
• sendkit.ai — client workspaces with dedicated IPs, isolated sending reputation, warmup, inbox-placement testing, and blacklist monitoring. White-labeling is available on its Pro tier. SendKit
• inboxally.com — particularly focused on deliverability monitoring: separate sender profiles per client, placement history, reporting, and Gmail/Postmaster monitoring. InboxAlly
• sendchief.com — more infrastructure-oriented: each client gets an isolated workspace, dedicated VPS, domains, mailboxes, and sending reputation. SendChief
• lettermint.co — useful if you're talking about transactional email rather than cold outreach. Each client can have a separate project, domain, analytics, and API keys under one account. Lettermint

If your requirement is specifically:

“Client A gets mail.clientA.com, Client B gets mail.clientB.com, and I can monitor each client's deliverability independently from an agency dashboard”

I'd look first at MailOptimal for outbound/cold email, or InboxAlly if the sending infrastructure already exists and your main need is deliverability monitoring.

If you tell me whether this is cold outreach, marketing/newsletters, or transactional email, I can narrow it down to the 2–3 platforms that actually fit that use case.

If you mean an agency managing email sending for many clients, with each client having its own domains, reputation, and deliverability reporting, there are a few strong fits:

My take

For a true agency infrastructure model, I'd look first at Mailgun. Its subaccounts are explicitly designed for this: each subaccount can have its own sending domains, IPs, API keys and users, while the agency retains centralized administration. You can also filter reporting, event logs, and usage by subaccount. Mailgun Documentation Mailgun Documentation

mailgun.com

If you're specifically doing cold outbound/lead generation, Smartlead is probably closer to what you're describing. Its infrastructure supports isolated domains/workspaces, and Smartlead specifically describes dedicated infrastructure per client as an agency use case. SmartLead Smartlead Help Center

smartlead.ai

If the key requirement is "I need a dashboard where I can monitor deliverability for 20–100 clients/domains", InboxAlly is worth looking at. It explicitly offers agency multi-client workspaces, per-client deliverability scores, and client reporting. InboxAlly

inboxally.com

And Mailers.io is interesting if you want the application layer to be multi-tenant: each client gets an isolated workspace with its own domains, credentials, suppression state, reporting, and usage, while the agency manages everything from one account. Mailers.io

mailers.io

If you tell me whether you're doing cold email, transactional email, or marketing/newsletters, and roughly how many clients (e.g. 10, 50, 500), I can narrow this to the 2–3 platforms that actually fit.

Yes. There are several platforms built specifically for this workflow: connect each client’s data sources → use a reusable report template → automatically refresh the data → send the report every month → keep your agency branding/client-specific branding intact.

A few worth looking at:

• agencyanalytics.com — Probably the closest match. It supports 85+ integrations, reusable templates, scheduled reports, approval before sending, white-label branding, custom domains, and separate branding profiles. You can configure a report once and have it automatically sent on the schedule you choose. AgencyAnalytics AgencyAnalytics
• dashthis.com — Strong option for agencies wanting polished dashboards/reports. It supports automated data refreshes, scheduled email delivery, custom branding, client-specific logos/colors, and custom domains. DashThis DashThis
• agencyanalytics.com — Particularly interesting if you want the reporting system to become a client portal rather than just monthly PDFs; clients can have branded access to live dashboards as well. AgencyAnalytics

The workflow you're describing

For example, you could have:

Client A
→ Google Analytics + Google Ads + Meta Ads
→ "Client A Monthly Report" template
→ automatically pulls Jan/Feb/etc. data
→ adds Client A's logo/colors
→ generates report
→ emails it on the 5th of every month

Client B
→ completely different data sources
→ same underlying template structure
→ Client B logo/colors/KPIs
→ automatically delivered on the 7th

The important distinction is that these aren't just dashboard tools. The good agency-focused ones let you clone templates and automate the recurring delivery, so you're not rebuilding reports every month. AgencyAnalytics, for example, explicitly supports cloned reports, scheduled reports, white-label URLs, and branded sending addresses. AgencyAnalytics Knowledge Base

If you're building an agency and want the most automated setup possible, I can also compare AgencyAnalytics vs DashThis vs Whatagraph vs Looker Studio + automation on pricing, integrations, white-labeling, AI-written summaries, and how much manual work remains per client.

Yes. There are several platforms built specifically