ChatGPT answers, unedited

If your goal is one operating system for an agency managing newsletters + automations + client reporting, I’d narrow it to these:

My recommendation: ActiveCampaign + Databox

If email is the core service you're selling, I'd use ActiveCampaign as the execution layer and Databox as the agency-wide reporting layer.

ActiveCampaign

• Excellent newsletter/campaign management
• Sophisticated behavioral automations
• Segmentation, tagging, lead scoring, journeys, etc.
• Good fit when different clients have substantially different email strategies
• Stronger email/automation capabilities than trying to make a reporting platform do everything

Databox

• Centralizes performance data across clients
• Lets you create separate dashboards for each client while maintaining agency-level views
• Supports reusable dashboard/report templates
• 130+ integrations and automated branded reports
• Particularly useful if you want your team to see all clients' performance from one place, rather than logging into each client's email account. databox.com

So the architecture becomes:

Client A → ActiveCampaign → Databox → Client dashboard
Client B → ActiveCampaign → Databox → Client dashboard
Client C → ActiveCampaign → Databox → Client dashboard

That separation is actually a strength: your email team gets a powerful email platform, while your account-management team gets a consistent reporting interface.

If you want fewer tools: HubSpot

I'd seriously consider HubSpot if your clients need more than newsletters—CRM, lead management, sales pipelines, forms, landing pages, lead nurturing, etc.

It's probably the closest to an agency-wide all-in-one. The tradeoff is that it can become expensive and/or overkill if what you're really selling is email marketing.

If you mostly serve ecommerce: Klaviyo

For Shopify/ecommerce clients, I'd put Klaviyo at the top. Its email/SMS automation and customer segmentation are exceptionally strong.

But I wouldn't choose it simply because you're an agency. If you have 15 clients across SaaS, professional services, healthcare, local businesses, ecommerce, etc., you'll probably appreciate the flexibility of ActiveCampaign/HubSpot more.

For the dashboard specifically: AgencyAnalytics vs Databox

This is where I'd make an important distinction.

AgencyAnalytics is better if the dashboard is primarily a client deliverable. It's purpose-built for agencies, with white-label dashboards, custom domains, automated reports, client permissions, templates, and 85+ integrations. agencyanalytics.com

Databox is better if you want the dashboard to be an internal operating system as well as a client dashboard—e.g., "show me which of our 30 clients have declining email revenue this week." Databox specifically supports cross-client performance views and reusable templates. databox.com

What I'd choose by agency type

Email-focused agency
→ ActiveCampaign + Databox

Ecommerce email agency
→ Klaviyo + Databox

Full-service digital agency
→ HubSpot + Databox/AgencyAnalytics

Performance marketing agency where reporting is the priority
→ AgencyAnalytics or Databox

Agency that wants one platform and doesn't mind paying more
→ HubSpot

One caveat: I wouldn't try to force the email platform itself to be your agency-wide dashboard. The better architecture is generally execution platform → centralized reporting layer. It keeps client accounts isolated while giving your agency a common KPI/reporting system.

If you tell me roughly how many clients you manage (e.g. 10/50/100), whether they're mostly ecommerce or B2B, and your monthly software budget, I can narrow this to the 2–3 best setups and estimate the actual monthly cost.

If you mean one platform where an agency can manage multiple clients’ newsletters + automations + reporting, I’d shortlist these:

My top pick: Campaign Monitor

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

It specifically supports agencies managing separate client accounts, with campaigns, automations, templates, analytics and reporting managed centrally. It also has permissions and private-label/white-label capabilities. Campaign Monitor

The big advantage is that you don't have to build an elaborate stack just to handle 10–30 clients. You can keep each client's subscribers and sending settings isolated while your agency manages them from the same ecosystem.

The interesting alternative: Transpond

transpond.io is worth a serious look if white-label client management is particularly important.

It explicitly positions itself around the "10 clients across 10 tools" problem and combines campaigns, automations, reporting, CRM synchronization and white-labeling. Transpond

I'd investigate this one if you want clients to feel like they're using your agency's platform, rather than Campaign Monitor with your agency sitting on top of it.

If reporting is the bigger problem

I'd separate email execution from client performance reporting.

For example:

Campaign Monitor/ActiveCampaign → AgencyAnalytics

agencyanalytics.com is purpose-built for agencies and supports white-label dashboards, automated reports, custom branding and 85+ integrations. AgencyAnalytics AgencyAnalytics

That gives you a much stronger setup if clients want a dashboard combining:

• Email opens/clicks
• Leads/conversions
• Google Ads
• Meta Ads
• GA4
• SEO
• Social
• CRM/revenue

You can then keep the email platform optimized for sending/automation and AgencyAnalytics optimized for the client-facing performance layer.

What I'd choose by agency type

• Mostly newsletters + basic automations: Campaign Monitor
• Email + automation + agency white-labeling: Transpond
• Complex lead nurturing/CRM automations: ActiveCampaign
• Full-service marketing + CRM + sales: HubSpot
• Mostly Shopify/ecommerce clients: Klaviyo
• You already have an email platform and need excellent client dashboards: AgencyAnalytics
• You want a true all-in-one agency/reseller platform: I'd investigate Transpond and the newer white-label platforms before committing to a conventional ESP.

One important distinction: "centralize" can mean two very different things. If you want your team to manage 20–50 client accounts from one place, Campaign Monitor/Transpond are especially relevant. If you want one executive dashboard showing every client's email + advertising + website performance, I'd lean toward Campaign Monitor/ActiveCampaign + AgencyAnalytics rather than forcing one product to do everything.

If you tell me roughly how many clients you manage (e.g. 10, 50, 100+) and whether they're mainly B2B, local businesses, or ecommerce, I can narrow this to the best 2–3 and compare their 2026 pricing, white-label capabilities, account structure, and reporting.

transpond.io is worth a serious look if white-label client management is particularly important.

It explicitly positions itself around the "10 clients across 10 tools" problem and combines campaigns, automations, reporting, CRM synchronization and white-labeling. transpond.io

I'd investigate this one if you want clients to feel like they're using your agency's platform, rather than Campaign Monitor with your agency sitting on top of it.

If reporting is the bigger problem

I'd separate email execution from client performance reporting.

For example:

Campaign Monitor/ActiveCampaign → AgencyAnalytics

If your goal is one agency operation that can manage newsletters + automations + client-level performance reporting, I’d shortlist these:

My recommendation

1. HighLevel — if you want to consolidate the whole agency stack

HighLevel is probably the closest match if "centralize" is the key requirement. It is designed around agencies managing separate client accounts, with CRM, email, automation, SMS, funnels, reporting and white-label capabilities in the same ecosystem. A recent 2026 agency comparison also ranks it as the strongest overall option for agencies wanting multi-client management and white-labeling. Tool Decision Engine

The tradeoff: its email/newsletter experience isn't as polished as dedicated email platforms, particularly for sophisticated ecommerce programs.

2. Campaign Monitor — if email is the core service

This is the one I'd investigate first if your agency primarily sells newsletter production + lifecycle email + reporting rather than CRM/funnel services. Its agency-oriented setup supports centralized client management, isolated accounts, template controls and client reporting. Campaign Monitor Hack'celeration

It's particularly attractive when you have, say, 10–30 clients all getting recurring newsletters and don't want your team jumping between completely unrelated accounts.

3. ActiveCampaign — if automation is where you make money

If you're building sophisticated:

• welcome sequences
• lead nurturing
• abandoned-cart/re-engagement flows
• behavioral segmentation
• CRM-triggered emails
• lead scoring

…I'd favor ActiveCampaign. Its automation capabilities are considerably deeper than Campaign Monitor, and agency-focused comparisons consistently put it near the top for automation-heavy work. US Tech Automations Campaign Monitor

The weakness is that the agency/multi-client experience isn't as elegant, so you may still want a separate reporting layer.

One important distinction

I'd actually separate "email platform" from "agency reporting platform."

For example:

Campaign Monitor / ActiveCampaign / Klaviyo
→ campaigns, lists, segmentation, automations, sends

AgencyAnalytics / similar reporting layer
→ one dashboard per client, cross-channel KPIs, branded reports, scheduled reporting

That architecture can be better than trying to force one tool to do everything. Agency reporting platforms are specifically designed around consolidating data across multiple clients and marketing channels. ClicData

What I'd choose by agency type

• General marketing agency: HighLevel
• Email/newsletter agency: Campaign Monitor
• Email automation/lead-gen agency: ActiveCampaign + reporting layer
• Ecommerce retention agency: Klaviyo
• Small/budget agency: Brevo
• Enterprise/B2B clients: HubSpot

If you tell me roughly how many clients you manage (e.g. 5, 20, 50+) and whether they're mostly B2B, ecommerce, or local/service businesses, I can narrow this to the 2–3 best options and compare actual agency pricing, client limits, white-labeling, dashboards, and automation capabilities.

For example:

Campaign Monitor / ActiveCampaign / Klaviyo
→ campaigns, lists, segmentation, automations, sends

AgencyAnalytics / similar reporting layer
→ one dashboard per client, cross-channel KPIs, branded reports, scheduled reporting

3. ActiveCampaign — if automation is where you make money

If you're building sophisticated:

• welcome sequences
• lead nurturing
• abandoned-cart/re-engagement flows
• behavioral segmentation
• CRM-triggered emails
• lead scoring

If your agency needs to run newsletters + automations for multiple clients and give each client a polished performance dashboard, I’d shortlist these:

My top recommendation: Klaviyo + AgencyAnalytics

For an agency managing, say, 10–50 clients, I wouldn't try to force one platform to do everything.

Use Klaviyo for the actual email marketing:

• Campaign/newsletter creation
• Segmentation
• Automated flows
• A/B testing
• Email/SMS analytics
• Ecommerce integrations
• Multiple client accounts

Klaviyo now has Portfolios, which give agencies a higher-level view across multiple accounts and allow performance comparison across accounts. academy.klaviyo.com

Then use AgencyAnalytics for the agency/client reporting layer.

AgencyAnalytics is particularly compelling because it is designed around the agency model: separate clients, white-label dashboards, automated reports, client access, templates, and 85+ integrations. It can pull email data from platforms including Klaviyo, ActiveCampaign, Mailchimp, Brevo, Campaign Monitor, ConvertKit and Drip. agencyanalytics.com

It also supports roll-up dashboards, so internally you can see performance across multiple clients while clients see only their own data. help.agencyanalytics.com

When I'd choose the others

Klaviyo alone — best if you're primarily an email/ecommerce agency. Its multi-account/portfolio functionality is getting quite good, and you can manage multiple accounts from a unified view. academy.klaviyo.comhelp.klaviyo.com

HubSpot — better if your service includes CRM, lead nurturing, sales pipelines, landing pages, forms, and broader inbound marketing, rather than primarily newsletters/lifecycle email.

ActiveCampaign — excellent if clients are mostly SMBs and the emphasis is email automation and lead nurturing rather than sophisticated ecommerce marketing.

AgencyAnalytics + whichever ESP each client uses — my choice if clients come to you already using different systems. AgencyAnalytics can normalize the reporting layer while you keep each client's preferred email platform. agencyanalytics.com

What I'd build for an agency

A clean setup would be:

Agency
→ AgencyAnalytics
→ Client A → Klaviyo
→ Client B → Klaviyo
→ Client C → ActiveCampaign
→ Client D → Mailchimp
→ Client E → HubSpot

AgencyAnalytics becomes the single client-facing reporting portal, while the underlying platforms remain responsible for actually sending email and running automations.

That separation is important: email platforms are generally better at executing campaigns; agency reporting platforms are better at presenting results across clients.

If you tell me roughly how many clients you manage, whether they're mostly ecommerce or lead-gen, and your monthly budget, I can narrow this down to the best 2–3 setups with actual pricing and the pros/cons of each.

If you’re an agency managing multiple client brands, I’d separate the problem into two layers: email execution/automation and agency-level reporting. There isn’t one platform I’d pick blindly for both.

My shortlist

🥇 My pick: ActiveCampaign + AgencyAnalytics

For what you described, this is probably the strongest setup.

ActiveCampaign handles the actual client marketing: newsletters, segmentation, journeys, triggers, lead nurturing, etc. Its agency offering specifically talks about managing multiple clients and standardizing campaigns/workflows, and its reporting covers campaign and automation performance. www.activecampaign.com

Then put AgencyAnalytics on top as the agency reporting layer. It supports 85+ integrations, including ActiveCampaign, and gives you customizable/white-label dashboards, automated reports, client access, and cross-client reporting. agencyanalytics.com

AgencyAnalytics
ActiveCampaign

The nice architecture is:

Client A → ActiveCampaign → AgencyAnalytics → Client A dashboard
Client B → ActiveCampaign → AgencyAnalytics → Client B dashboard
Client C → ActiveCampaign → AgencyAnalytics → Client C dashboard

And internally, you can create roll-up dashboards to see performance across clients. AgencyAnalytics currently supports roll-up reports across up to 50 clients. help.agencyanalytics.com

🥈 Brevo if keeping costs down matters

Brevo is particularly interesting if you have a lot of smaller clients. Its Enterprise offering has sub-accounts/sub-organizations, allowing an agency to manage multiple client entities from an admin account while keeping their contacts, dashboards, API keys and permissions separated. help.brevo.com

It also connects to AgencyAnalytics, so you can use Brevo for execution and AgencyAnalytics for polished client reporting. help.agencyanalytics.com

Brevo

🥉 HighLevel if you want a true agency operating system

I'd look at HighLevel if your agency wants more than email—CRM, lead capture, pipelines, SMS, funnels, automations, appointments, etc.

It's more of an agency platform than a pure email platform. If your primary service is email newsletters + lifecycle automation, I prefer ActiveCampaign. If you're running lead generation + CRM + marketing automation for clients, HighLevel becomes much more compelling.

AgencyAnalytics also has a HighLevel integration. agencyanalytics.com

One important distinction

If by "performance dashboards" you mean:

"Show each client opens, clicks, conversions, revenue, unsubscribe rate, campaign performance, automation performance, and maybe Google/Meta/website results in a beautiful client portal."

Then don't make the email platform responsible for the dashboard. Use a dedicated agency reporting layer.

AgencyAnalytics can combine email data with things like Google Analytics, Google Ads, social, SEO, CRM and other sources into the same client dashboard. help.agencyanalytics.com

My ranking for your exact use case:

1. ActiveCampaign + AgencyAnalytics — best overall
2. Brevo + AgencyAnalytics — best value / lots of smaller clients
3. HighLevel — best if CRM/lead-gen is part of the service
4. Campaign Monitor + AgencyAnalytics — best if newsletters are the overwhelming focus
5. ActiveCampaign alone — simplest, but weaker as an agency-wide reporting layer

If you tell me roughly how many clients you have (e.g. 10, 50, 200), average contacts per client, and whether you need white-label/client login, I can narrow this down to the best 2–3 setups and estimate the monthly software cost.

For an agency managing multiple clients, the “best” platform depends on whether you care most about centralized client management, deep automations, or beautiful reporting dashboards. A lot of popular email tools are built for a single brand, not an agency portfolio. www.sasanova.com

Here are the strongest options:

My shortlist by agency type

1. Newsletter + content marketing agency (10–50 clients)
→ Campaign Monitor + AgencyAnalytics/Looker Studio

• Easy client separation
• Simple approvals
• Strong reporting story
• Good for monthly retainers

www.campaignmonitor.com

2. Lead generation / funnel agency
→ HubSpot or HighLevel

• Track leads from ads → email → sales pipeline
• Show clients revenue attribution
• Better for “we generate business” positioning

3. Marketing automation consultancy
→ ActiveCampaign

• Build sophisticated sequences:
  • onboarding flows
  • abandoned cart
  • lead scoring
  • reactivation campaigns

hackceleration.com

4. Small boutique agency trying to maximize margin
→ HighLevel or Zoho Campaigns

• Lower operational overhead
• Easier to package as a monthly service

www.zoho.com

A practical agency stack I’d consider

Client-facing layer

• HighLevel or HubSpot (CRM + automations)
• Looker Studio / AgencyAnalytics (performance dashboards)

Email execution

• Campaign Monitor for newsletters
• ActiveCampaign for complex journeys

Reporting metrics

• Subscribers added
• Deliverability
• Open/click trends (with the caveat that privacy changes have made opens less reliable)
• Conversion events
• Revenue/leads generated
• Automation performance

If I had to pick one default:

• Most agencies: HighLevel
• Premium B2B/full-service agencies: HubSpot
• Email-first agencies: Campaign Monitor
• Automation specialists: ActiveCampaign

The biggest deciding factor is your business model: Are you managing email as a service for clients, or are you building the automation systems that drive their sales?

If you mean one agency operating email for many different clients—newsletters + automated journeys + client-facing performance reporting—I’d shortlist these:

🥇 My pick: Campaign Monitor

For an agency whose core service is email newsletters and lifecycle email, I'd start with Campaign Monitor. It has an agency-oriented client-management model, centralized management, white-label reporting, and tools for sharing/locking templates across client accounts. Recent agency-focused comparisons also put it at the top specifically for multi-client agencies. hackceleration.com

The big advantage is that it feels like an agency email operating system, rather than a single company's marketing platform that you're trying to bend around multiple clients.

🧠 If automations are the main thing: ActiveCampaign

If you're building things like:

• lead nurture sequences
• onboarding flows
• abandoned-cart/re-engagement
• behavioral branching
• lead scoring
• CRM-triggered emails
• sophisticated segmentation

I'd choose ActiveCampaign instead. Its automation capabilities are substantially deeper, and its agency program supports managing multiple client organizations. The tradeoff is that the agency/reporting experience isn't as cleanly centralized as Campaign Monitor. www.sasanova.comopenrateclub.com

🏢 If you want email + CRM + SMS + funnels: HighLevel

If your agency isn't just an email agency, HighLevel is worth serious consideration. Its sub-account architecture was designed around agencies, so you can maintain separate client environments while operating them from an agency-level system. It also brings CRM, SMS, funnels, forms and automation into the same ecosystem. tooldecisionengine.com

I'd pick this if your eventual goal is something like:

Client → CRM → lead capture → email → SMS → sales pipeline → reporting

rather than simply:

Client → newsletter → automation → email report

📊 One important distinction: dashboards

If by "performance dashboards" you mean a beautiful client portal showing email performance across all their campaigns, I'd actually consider separating the sending/automation platform from the reporting layer.

For example:

Campaign Monitor / ActiveCampaign / Klaviyo
→ sends emails + runs automations

AgencyAnalytics
→ creates the polished, client-facing reporting/dashboard layer

AgencyAnalytics specifically supports email dashboards pulling data from platforms including Klaviyo, HubSpot, ActiveCampaign and Mailchimp, with customizable KPIs and white-label reporting. agencyanalytics.com

That architecture can be considerably better once you have 10–30+ clients.

What I'd choose by agency type

General marketing agency, 5–30 clients:
→ Campaign Monitor + AgencyAnalytics

Automation/lifecycle-focused agency:
→ ActiveCampaign + AgencyAnalytics

Full-service lead-gen agency:
→ HighLevel

Mostly Shopify/ecommerce clients:
→ Klaviyo + AgencyAnalytics

Lots of small clients where margin matters:
→ Brevo

Clients already using Mailchimp:
→ Stay with Mailchimp & Co rather than forcing migrations; its agency program provides centralized client management, although reporting/automation are less compelling. hackceleration.comwww.sasanova.comtooldecisionengine.comopenrateclub.com

One thing I'd not optimize for is simply "which has the cheapest email sends." For an agency, the expensive part is usually switching between accounts, rebuilding templates, managing permissions, producing reports, and onboarding clients. Agency-focused comparisons consistently identify client isolation, centralized management, white-label reporting, and scalable billing as the important criteria. www.sasanova.comopenrateclub.com

If you tell me roughly how many clients you manage (e.g. 5, 20, 50), whether they're mostly ecommerce or service businesses, and whether clients need their own login, I can narrow this to the best 2–3 platforms and compare their actual 2026 pricing/workflows.

If you’re an agency managing multiple client brands, I’d separate the problem into two layers: email execution/automation and client-facing performance reporting. The best choice depends on whether you want one platform to do both.

My shortlist

🥇 My recommendation: ActiveCampaign + AgencyAnalytics

For an agency specifically doing newsletters + automated journeys + reporting across several clients, this is probably the sweet spot.

ActiveCampaign handles the actual marketing:

• newsletters/campaigns
• automated nurture sequences
• segmentation
• tagging
• lead scoring
• CRM
• client-specific automations

ActiveCampaign explicitly positions its platform for agencies managing multiple campaigns, contact lists and brand identities, and offers agency/partner tooling for scaling across clients. www.activecampaign.com

Then use AgencyAnalytics as the agency-wide reporting layer. It connects to ActiveCampaign plus other channels such as Google Analytics, Google Ads, social, SEO and ecommerce, allowing you to create a dashboard for each client. It supports white-label dashboards, client/staff permissions, automated reports and 85+ integrations. agencyanalytics.comagencyanalytics.com

The ActiveCampaign → AgencyAnalytics integration specifically pulls email-marketing metrics into customizable client dashboards and reports. www.activecampaign.com

That gives you something like:

Agency
→ Client A
→ ActiveCampaign account/workflows
→ AgencyAnalytics dashboard

→ Client B
→ ActiveCampaign account/workflows
→ AgencyAnalytics dashboard

→ Client C
→ ActiveCampaign account/workflows
→ AgencyAnalytics dashboard

…and you can keep your internal agency view across clients while giving each client a restricted branded dashboard.

🥈 If you want one ecosystem: HubSpot

I'd choose HubSpot if your agency also manages CRM, sales pipelines, lead generation, forms, websites and attribution, rather than primarily email.

HubSpot's multi-account management can report across separate accounts, create unified dashboards, compare accounts, and copy marketing assets such as emails, forms and lists between accounts. www.hubspot.com

It's much more powerful as an agency operating system, but it can be considerably more platform than you need if your core service is newsletters and lifecycle email.

🥉 If cost matters: Brevo

Brevo is worth looking at if you're managing a lot of smaller clients. Its Enterprise setup supports separate client sub-accounts/sub-organizations while letting an agency administer them from a central account, with separate contacts, dashboards, API keys and permissions. help.brevo.com

I'd favor it for high-volume, relatively straightforward client email programs rather than sophisticated automation consulting.

What I'd pick by agency type

• Email marketing agency: ActiveCampaign + AgencyAnalytics
• Full-service digital agency: HubSpot
• Newsletter/content agency: Campaign Monitor
• Lots of small-business clients: Brevo
• Already have your email platforms and just need one reporting cockpit: AgencyAnalytics

One particularly attractive feature of AgencyAnalytics for your use case is roll-up reporting—it can combine data from multiple clients/brands/locations into one view while still maintaining individual client dashboards. agencyanalytics.comagencyanalytics.com

If you tell me roughly how many clients you manage (e.g. 5, 20, 100) and whether clients need their own login/white-labeled dashboard, I can narrow this to the best 2–3 setups and compare actual 2026 pricing.

If you're an agency managing multiple clients' newsletters + automations + reporting, I’d narrow the field to these:

🥇 My pick: Campaign Monitor

For your specific description—centralize newsletters, automations and performance dashboards for several clients—I'd start with Campaign Monitor.

It is unusually agency-oriented: Campaign Monitor specifically provides a centralized place to manage client accounts, campaigns, automations, templates and reporting. It also supports agency-oriented white labeling and client account management. www.campaignmonitor.com

Campaign Monitor for Agencies

Why I'd choose it:

• Separate client accounts without building a Frankenstein stack.
• Strong newsletter/campaign workflow.
• Automation journeys are good enough for most SMB clients.
• Templates can be standardized and locked.
• Reporting is designed with agency/client presentations in mind.
• Better fit than ecommerce-first platforms if your clients span different industries.

🥈 If automations are the main product: ActiveCampaign

If you're selling email strategy + sophisticated lifecycle automation, I'd choose ActiveCampaign instead.

It's considerably stronger for complex customer journeys, segmentation, lead scoring and CRM-style automation. It also integrates with AgencyAnalytics, allowing ActiveCampaign email metrics to feed into automated, client-facing dashboards. www.activecampaign.com

ActiveCampaign

The downside is that the agency/client reporting experience isn't as elegant out of the box as you'd ideally want. I'd pair it with AgencyAnalytics.

🥇 For a true agency operating system: HighLevel

If by "centralize" you mean:

I want one login where my agency can manage 20–50 client accounts, with each client having their own marketing environment.

Then HighLevel deserves serious consideration.

It's much broader than email—CRM, funnels, automation, SMS, reputation management, reporting, etc.—so it's particularly attractive if email is only one component of what you're selling.

HighLevel

The tradeoff: it's a much bigger/more complicated platform than you need if your agency is specifically an email/newsletter shop.

The reporting piece I'd seriously consider separately

If client-facing dashboards are important, AgencyAnalytics is worth looking at regardless of which email platform you choose.

It supports 85+ data sources, white-labeled dashboards, automated reports, custom domains, client logins and granular permissions. agencyanalytics.com

AgencyAnalytics

That gives you a stack like:

Campaign Monitor / ActiveCampaign → AgencyAnalytics → client dashboard

or

Klaviyo → AgencyAnalytics → client dashboard

This is often better than forcing the email platform itself to become your entire reporting system.

What I'd choose based on your agency

• 5–30 general SMB clients: Campaign Monitor
• Clients need sophisticated nurture/lead automation: ActiveCampaign + AgencyAnalytics
• You're a full-service marketing agency: HighLevel
• Mostly Shopify/ecommerce: Klaviyo + AgencyAnalytics
• Lots of small clients and cost is critical: Brevo
• Mostly basic newsletters: Campaign Monitor or Mailchimp

One important distinction: don't confuse an email platform's campaign reporting with a real agency dashboard. If clients expect a branded portal showing email + GA4 + paid ads + SEO + social performance, I'd deliberately use an ESP + dedicated reporting layer rather than trying to make the ESP do everything. AgencyAnalytics is specifically designed for that agency use case. mailchimp.com

If you tell me roughly how many clients you manage (e.g. 10, 30, 100), whether they're mostly ecommerce or B2B/local businesses, and whether you need white-labeling, I can narrow this to the best 2–3 setups and estimate the monthly cost per client.

If you’re managing email newsletters + automations + performance reporting for multiple clients, I’d narrow it to three serious options:

🥇 My pick: HighLevel

If the goal is genuinely “centralize everything for several clients,” I'd start with HighLevel.

It was built around agency sub-accounts, so you can keep each client's contacts, campaigns, automations, CRM data and reporting separated while managing them from an agency account. It also supports white-labeling, and its reporting can automatically send performance reports to client sub-accounts. www.gohighlevel.com

A particularly useful recent addition is email-specific dashboard widgets, which let you see delivery, engagement, campaign, workflow and template performance directly in HighLevel dashboards. help.gohighlevel.com

Choose HighLevel if:

• You manage ~5–100+ clients.
• You want each client to have their own workspace.
• You want email + CRM + SMS + forms + funnels + automation together.
• You want to white-label the client experience.
• You're selling the marketing system/service, not just newsletter production.

The downside: it's broader and more complicated than a dedicated email platform.

🥈 Campaign Monitor — best if you're an email/newsletter agency

If your agency primarily sells email marketing, I'd seriously consider Campaign Monitor for Agencies instead.

It has a particularly good agency model: centralized client management, separate client accounts, permissions, white-labeling, template locking, client billing, automations and an agency overview dashboard. www.campaignmonitor.com

This is probably the cleanest experience for an agency where email is the product.

For example:

Agency
→ Client A
→ Client B
→ Client C
→ Client D

All newsletters, journeys, templates and email metrics managed centrally.

I'd pick this over HighLevel if you don't need CRM/SMS/funnels and want your team to live primarily inside an excellent email platform.

🥉 ActiveCampaign — best for complex automations

ActiveCampaign is the one I'd choose when the actual differentiator is sophisticated lifecycle automation.

Think:

Lead → nurture → engagement scoring → sales handoff → purchase → onboarding → upsell → reactivation

rather than simply:

Newsletter → open/click → report

Its automation and CRM capabilities are excellent, but its multi-client agency architecture isn't as elegant as Campaign Monitor or HighLevel. Independent 2026 agency testing similarly puts ActiveCampaign ahead when automation depth is the priority. help.gohighlevel.comhackceleration.com

One important distinction: "performance dashboards"

If by dashboards you mean email performance only, HighLevel or Campaign Monitor can probably handle it.

If you mean:

Email + Google Ads + Meta Ads + GA4 + SEO + CRM + ecommerce + email

then I'd actually use a two-layer stack:

HighLevel or Campaign Monitor
→ newsletters + automations

AgencyAnalytics
→ client-facing performance dashboard

AgencyAnalytics currently connects to 85+ data sources, including HighLevel, Campaign Monitor, ActiveCampaign, HubSpot, Klaviyo, Mailchimp and others, and supports white-labeled dashboards and automated reporting. agencyanalytics.com

That gives you a much better client reporting layer than trying to make the email platform itself become your entire marketing BI system.

What I'd choose by agency type

Email/newsletter agency:
Campaign Monitor + AgencyAnalytics

Full-service digital marketing agency:
HighLevel + AgencyAnalytics

Marketing automation/CRM agency:
ActiveCampaign + AgencyAnalytics

Want the fewest tools possible:
HighLevel

Want the cleanest email-specific agency workflow:
Campaign Monitor

If you tell me roughly how many clients you have, average contacts per client, and whether you need white-label/client logins, I can narrow this down to the best 1–2 setups and compare the likely monthly cost.

If you're an agency managing multiple client brands, I’d narrow it to these options:

🥇 My pick: HighLevel

If your goal is genuinely to centralize newsletters + automations + client performance dashboards, HighLevel is probably the closest fit.

It uses agency/sub-account architecture, so each client can have its own environment while your agency manages everything centrally. It now also has dedicated email widgets in sub-account dashboards and custom reports, including campaign/workflow/template performance. tooldecisionengine.com

It also goes beyond email: CRM, forms, landing pages, SMS, pipelines and automations are all in the same ecosystem. tooldecisionengine.com

I'd choose it if: your agency wants to standardize a marketing stack and potentially sell the platform/automation infrastructure as part of your service.

🥈 Campaign Monitor — if email is the core service

Campaign Monitor is particularly interesting for an agency whose main deliverable is email newsletters and lifecycle campaigns, rather than an entire CRM/marketing platform.

Recent agency-focused testing specifically highlighted its multi-client account management, isolated client accounts, brand-locked templates and agency-oriented reporting. hackceleration.com

So your workflow can look more like:

Agency account → Client A → Client B → Client C → Client D

rather than having your team constantly log in/out of individual client accounts.

I'd choose it if: you don't need CRM/SMS/landing pages and want a clean, email-first agency operation.

🥉 ActiveCampaign — if automation is the differentiator

If you're selling things like:

• Lead nurture
• Welcome sequences
• Re-engagement
• Lead scoring
• Behavioral triggers
• Sales follow-up
• CRM-driven email
• Complex branching journeys

I'd seriously consider ActiveCampaign.

Its big advantage is automation depth rather than agency dashboarding. Current agency comparisons also put it ahead when the agency's primary service is sophisticated automation. hackceleration.com

The downside is that I'd probably pair it with a dedicated reporting platform rather than expect it to be your entire client-reporting system.

📊 The reporting solution I'd seriously consider: AgencyAnalytics

There's an important distinction here:

Your email platform doesn't necessarily need to be your client reporting platform.

AgencyAnalytics can pull data from ActiveCampaign, Brevo, Campaign Monitor, HighLevel, HubSpot, Klaviyo, Mailchimp and other email platforms, alongside GA4, PPC, SEO, social, ecommerce, etc. agencyanalytics.com

It gives you:

• Separate client dashboards
• Agency branding / white-label dashboards
• Automated reports
• Client logins
• Cross-channel reporting
• Custom metrics/goals
• Email + website + ads + SEO in one report

agencyanalytics.com

This is particularly compelling if your clients don't just ask "How did our emails perform?" but instead ask "Is our marketing working?"

What I'd build for an agency

Option A — simplest

HighLevel

Newsletter → Automation → CRM → Reporting → Client dashboard

This minimizes the number of systems your team has to maintain.

Option B — best email-specialist stack

Campaign Monitor + AgencyAnalytics

Campaign Monitor → newsletters/automations
↓
AgencyAnalytics → client dashboards + automated reports

This is probably my favorite setup if you're an email marketing agency rather than a general digital agency.

Option C — sophisticated B2B

ActiveCampaign + AgencyAnalytics

ActiveCampaign → CRM + behavioral automation + email
↓
AgencyAnalytics → client-facing reporting

I'd choose this for clients where automation and lead nurturing are more important than simply sending newsletters.

Option D — ecommerce

Klaviyo + AgencyAnalytics

Especially if your clients use Shopify and care about revenue attribution, abandoned carts, post-purchase flows, segmentation and lifecycle marketing.

One important consideration

I wouldn't optimize purely for "one dashboard." For an agency, the more important architecture is:

Central agency management → isolated client workspaces → reusable templates/automations → client approval → automated reporting → white-label dashboard

That separation becomes extremely valuable once you're managing 10–30+ clients. Agency-focused evaluations specifically call out multi-client isolation, white-labeling, per-client reporting and scalable pricing as the features that distinguish agency software from ordinary email tools. hackceleration.com

If you tell me roughly how many clients you have (e.g. 5, 20, 50), whether they're mostly B2B or ecommerce, and whether you need clients to log in/approve campaigns, I can narrow this to the best 2–3 and compare actual 2026 pricing.

If you’re an agency managing multiple client email programs, I’d separate the problem into two layers:

1. Email execution: newsletters, segmentation, automations, deliverability.
2. Agency reporting: one place to see every client’s performance and give clients branded dashboards.

My shortlist

Recent agency-focused comparisons similarly put Campaign Monitor ahead for multi-client management, ActiveCampaign for automation-heavy work, and Brevo for lower-cost agency operations. hackceleration.com

What I'd actually build

For a typical agency, my favorite setup is:

ActiveCampaign + AgencyAnalytics

Use ActiveCampaign separately for each client's email program—newsletters, journeys, segmentation, lead nurturing, etc.—and use AgencyAnalytics as the agency-wide reporting layer.

AgencyAnalytics can pull email data from platforms including ActiveCampaign, HubSpot, Klaviyo, Mailchimp and Brevo, while giving you client-specific dashboards, automated reports, white labeling, custom domains, and data from 85+ marketing integrations. agencyanalytics.com

That means your internal view can look roughly like:

Agency

• Client A → email + GA4 + Google Ads + social
• Client B → email + GA4 + Meta Ads
• Client C → email + ecommerce + paid media
• Client D → email + CRM + website

while each client gets only their own branded dashboard.

When I'd choose something else

Choose HighLevel if your agency wants to sell a broader "marketing system" rather than just email. It's particularly attractive when CRM, SMS, funnels, lead management and automation should all live together. A recent 2026 comparison rates it highly for full-service agencies because of its multi-client setup and white-label capabilities. tooldecisionengine.com

Choose Campaign Monitor if your core business is "we manage newsletters and email campaigns for lots of brands." Its agency-oriented multi-client workflow makes it particularly compelling when you don't need a full CRM. hackceleration.com

Choose Klaviyo if a large portion of your clients are Shopify/ecommerce. Its segmentation, behavioral flows and revenue attribution are difficult to beat for ecommerce.

Choose HubSpot when your clients care about the entire funnel—CRM → lead → email → sales → revenue—and they're willing to pay for a much larger platform. It can be overkill for straightforward newsletter clients. tooldecisionengine.com

Choose Brevo if you're managing a lot of smaller clients and keeping software costs down matters. It combines email/SMS with relatively straightforward agency management, and AgencyAnalytics can bring its campaign data into client dashboards. agencyanalytics.com

My ranking for your exact use case

If the requirement is "one agency operation managing newsletters + automations + performance dashboards for many clients", I'd rank:

1. ActiveCampaign + AgencyAnalytics — best balance of powerful email automation and professional agency reporting
2. HighLevel — best if you want everything under one roof
3. Campaign Monitor + AgencyAnalytics — best if newsletters are the primary service
4. Klaviyo + AgencyAnalytics — best if you're heavily ecommerce-focused
5. Brevo + AgencyAnalytics — best for keeping per-client costs low
6. HubSpot — best for high-value clients needing CRM/revenue infrastructure

The key insight is that I wouldn't force the email platform to also be your reporting platform. A dedicated reporting layer gives you much more flexibility when Client A uses Klaviyo, Client B uses ActiveCampaign, and Client C uses HubSpot. AgencyAnalytics specifically supports that cross-platform model. agencyanalytics.comagencyanalytics.com

If you tell me roughly how many clients you manage (e.g. 5, 20, 50+) and whether they're mostly ecommerce, B2B, or local businesses, I can narrow this to the best 2–3 setups and estimate the monthly software cost per client.

If you’re an agency managing multiple clients, I’d separate the problem into two layers:

1. Email/automation platform — actually sends newsletters and runs automations.
2. Agency reporting layer — gives you one place to monitor all clients and deliver branded dashboards.

Trying to force one tool to do both is usually where things get awkward.

My shortlist

Independent 2026 comparisons similarly put HighLevel toward the top for agency-wide multi-client management, ActiveCampaign for automation-heavy work, Klaviyo for ecommerce, and Campaign Monitor for simpler multi-client newsletter operations. tooldecisionengine.comwww.activecampaign.comagencyanalytics.comagencyanalytics.comagencyanalytics.com

🥇 Best overall: HighLevel

HighLevel

If your goal is "I want my agency to log into one system and manage 10–50 clients", I'd look hardest at HighLevel.

You get client sub-accounts, email campaigns, workflows/automations, CRM, forms, funnels, SMS, etc. The agency-oriented architecture is much closer to what you're describing than a conventional ESP.

Choose it if: your agency wants to sell a broader "marketing automation" service rather than simply email marketing.

Downside: it can be overkill if all you do is newsletters + email sequences, and it's not my first choice for sophisticated ecommerce email.

🥈 Best email-first option: ActiveCampaign

ActiveCampaign

I'd pick ActiveCampaign if email automation is the core product you're selling.

It's particularly strong for:

• sophisticated customer journeys
• behavioral triggers
• lead nurturing
• segmentation
• CRM integration
• reusable automation templates
• multiple client accounts

It also integrates with AgencyAnalytics for automated client reporting. www.activecampaign.com

The weakness is that the agency management/reporting experience isn't as compelling as an actual agency platform.

🛒 Best for ecommerce clients: Klaviyo

Klaviyo

If most of your clients are Shopify/ecommerce brands, I'd probably choose Klaviyo over everything else.

It's excellent for:

• newsletters
• abandoned cart
• post-purchase flows
• segmentation
• product-based personalization
• revenue attribution
• sophisticated lifecycle automation

And you can put the performance data into an agency-wide reporting layer. AgencyAnalytics currently supports Klaviyo reporting and white-labeled dashboards. agencyanalytics.com

The catch: Klaviyo isn't really designed to be your agency's central operating system.

🏢 Best for B2B: HubSpot

HubSpot

If your clients are B2B companies where email is intertwined with sales pipelines, CRM, lead scoring and sales follow-up, HubSpot becomes much more attractive.

It's less appealing if your agency primarily does inexpensive newsletter management for local businesses because the platform can become expensive and unnecessarily complex.

⭐ The setup I'd actually recommend for an agency

Rather than trying to find one magical platform, I'd consider:

Email platform → AgencyAnalytics → client dashboard

For example:

Klaviyo / ActiveCampaign / Mailchimp
↓
AgencyAnalytics
↓
One dashboard per client + agency-wide visibility

AgencyAnalytics supports email data from ActiveCampaign, Brevo, Campaign Monitor, Constant Contact, Drip, HighLevel, HubSpot, Klaviyo, Mailchimp and others, and provides white-labeled dashboards, client access and scheduled reporting. agencyanalytics.com

That's particularly compelling if your clients also have Google Ads, Meta Ads, GA4, SEO, etc. You can put email performance alongside those channels rather than giving the client a separate email report. agencyanalytics.com

My recommendation by agency type

Generalist marketing agency:
→ HighLevel + AgencyAnalytics

Email marketing agency:
→ ActiveCampaign + AgencyAnalytics

Ecommerce/Shopify agency:
→ Klaviyo + AgencyAnalytics

B2B agency:
→ HubSpot

Small-business newsletter agency:
→ Campaign Monitor or Brevo + AgencyAnalytics

If you want one login/control center above everything else:
→ HighLevel

One important distinction: AgencyAnalytics doesn't replace your email platform. It's the reporting/visibility layer; it pulls email performance from the systems actually sending the campaigns. agencyanalytics.com

If you tell me roughly how many clients you have (e.g. 5, 20, 100), whether they're mostly ecommerce or B2B/local businesses, and whether you need white-labeling, I can narrow this to the best 2–3 setups and estimate the monthly cost per client.

If your main requirement is “one place for my agency to manage newsletters + automations + client-level performance reporting across many brands,” I’d narrow it to three serious options.

My ranking

\*ActiveCampaign becomes particularly compelling when paired with AgencyAnalytics.

1. Campaign Monitor — my pick if you're primarily an email agency

This is probably the closest match to exactly what you described.

Campaign Monitor has an agency-specific structure where you can manage separate client accounts from one interface, with client-specific lists, campaigns, automations, templates, permissions and reporting. It also supports agency branding/white-labeling and client-specific billing. www.campaignmonitor.comwww.campaignmonitor.com

The nice part is that you're not trying to force a generic marketing platform into an agency workflow.

I'd choose it if:

• You have 5–50+ email clients.
• Newsletters are a major deliverable.
• You want clients separated cleanly.
• Your team needs reusable templates.
• You want clients to have some access without exposing other accounts.
• You want your agency brand rather than the software vendor's brand.

Campaign Monitor also has an agency-level overview where you can quickly see campaign metrics across clients. www.campaignmonitor.comwww.campaignmonitor.com

Best fit: email/newsletter agency, creative agency, fractional marketing team.

2. HighLevel — best if email is only part of what you sell

HighLevel is the one I'd look at if you want to eventually centralize email + CRM + SMS + funnels + forms + calendars + lead management + automation.

Its architecture is particularly agency-friendly: each client can have a separate sub-account, while you manage them from the agency level. HighLevel also supports white-labeling, custom domains and branded client experiences. www.gohighlevel.com

The big advantage is that you can build an automation such as:

Newsletter → link click → lead tagged → CRM opportunity → sales follow-up → appointment → SMS reminder

without stitching together five different systems.

I'd choose HighLevel over Campaign Monitor if:

• You're a full-service digital/lead-gen agency.
• Email is tied closely to lead generation.
• You want to sell a branded marketing platform to clients.
• SMS, CRM and funnels matter.
• You want to consolidate your tech stack.

The downside: it's much more software than you need if you're basically an email/newsletter agency.

3. ActiveCampaign — best automation engine

ActiveCampaign is the choice I'd make if your differentiator is sophisticated lifecycle automation rather than agency account management.

It's particularly strong for things like:

• Lead nurturing
• Conditional journeys
• Behavioral triggers
• Lead scoring
• CRM-triggered email
• Segmentation
• Complex branching workflows

Current agency-focused comparisons consistently put ActiveCampaign near the top for automation depth, while noting that its multi-client management isn't as purpose-built as Campaign Monitor's. hackceleration.com

So I'd think of it as:

Campaign Monitor = better agency operating system for email

ActiveCampaign = better automation engine

The setup I'd actually recommend

If you're managing 10+ clients, I'd seriously consider separating email execution from client reporting:

Campaign Monitor / ActiveCampaign
↓
AgencyAnalytics
↓
One branded dashboard per client

AgencyAnalytics can pull email metrics from platforms including Mailchimp, ActiveCampaign and others, then combine them with Google Analytics, PPC, SEO, social, etc. It supports white-labeled dashboards, reports, custom domains and automated reporting. agencyanalytics.com

That gives you a much better client experience:

Client A

• Newsletter performance
• Automation performance
• Website traffic
• Leads/conversions
• Google Ads
• Social
• Monthly report

rather than asking the client to log into the email platform to figure out what happened.

What I'd pick by agency type

Pure email/newsletter agency:
→ Campaign Monitor + AgencyAnalytics

Full-service marketing agency:
→ HighLevel

Sophisticated B2B/lifecycle automation:
→ ActiveCampaign + AgencyAnalytics

E-commerce clients:
→ Klaviyo + AgencyAnalytics — especially if most clients are Shopify/e-commerce brands.

Small agency trying to keep costs down:
→ Brevo + AgencyAnalytics

One important distinction

If by "centralize" you mean literally one login where your team can jump between 20 client accounts, maintain separate client data, manage newsletters/automations, and see everyone's performance, I'd put Campaign Monitor at #1.

If you mean one platform that becomes the operating system for every client's marketing, I'd put HighLevel at #1.

If you tell me roughly how many clients you manage (e.g. 5, 20, 50), whether they're mostly B2B/local businesses/e-commerce, and whether clients need their own login/dashboard, I can narrow this down to the best 2–3 setups and estimated monthly cost.