ActiveCampaign vs Mailerflow: Automation Compared

ActiveCampaign vs Mailerflow comes down to one question: do you want a mature automation engine you build by hand, or an AI-first sender that drafts emails and workflows for you to review? ActiveCampaign is the established option — a deep, hand-built automation platform with an integrated CRM, advanced segmentation and a large integration ecosystem. Mailerflow is the newer, AI-first alternative: describe an email or a workflow in a sentence, get a draft, then edit it. Neither wins universally, and the right answer depends on how much automation you actually build, how many contacts you have, and whether you need a CRM in the same tool.

The short answer

If your automation is the product — complex branching, lifecycle stages, sales pipelines, ecommerce events — ActiveCampaign's depth is the point, and its Pro and Enterprise tiers are built for exactly that. If your automation is a means to an end — onboarding, win-back, cart recovery, a weekly newsletter — and you'd rather describe the sequence than drag 30 blocks into place, Mailerflow's AI drafting plus unlimited emails on every paid plan changes the cost math.

The rest of this article gives you the criteria: pricing structure, editor, automation model, segmentation, deliverability, API and data location. Apply them to your own list size and sending volume rather than to a generic "best" ranking.

Comparison table

ActiveCampaign facts verified 2026-10-11 on activecampaign.com/pricing; Mailerflow facts from mailerflow.ai/pricing.

Pricing and plan limits

The two products price on different axes, which is why a straight "which is cheaper" answer rarely holds.

ActiveCampaign

What is verified: plans are billed annually. Pro includes 3 users and unlimited automation actions, and is described as unlocking enhanced email orchestration. Enterprise includes 5 users, unlimited automation actions, SSO, a dedicated account team, premium CRM and ecommerce integrations and premium segmentation, and is described as running email marketing at scale with enterprise-level support. A 30-day money-back guarantee applies.

ActiveCampaign prices by contact count and plan tier, so the entry price depends on your list size. Check the official pricing page for current numbers rather than relying on a figure quoted in an article.

Mailerflow

Yearly billing costs the same as 10 months. The Free plan carries Mailerflow branding; paid plans do not.

Modelling your own cost

Four numbers decide it: contacts stored, emails sent per month, seats you need, and automations running at once. Sending volume is where the two models diverge most — if you send 8–12 campaigns a month to a 20,000-contact list, a per-email component dominates the bill, while a contact-based plan with unlimited sending stays flat. Write your own numbers down before comparing quotes.

Email editor and templates

ActiveCampaign's editor is a mature drag-and-drop builder with a template library and years of community-built designs behind it. If you have a designer or a brand system, that maturity is an advantage: predictable, pixel-level control.

Mailerflow uses a visual block editor — headings, heroes, products, columns, social links — with reusable templates, plus an AI email builder where you describe the email and get a complete responsive design along with subject lines and preview text. The practical question is time per campaign. If you send two campaigns a month, AI drafting saves you an hour you'd otherwise spend on layout. If you send twenty and every one is brand-critical, you'll want the block editor and templates as your primary path, with AI as a first draft.

Automation: hand-built depth vs AI-drafted workflows

This is the real difference, and it's worth being precise about it.

ActiveCampaign's strength is depth. Pro and Enterprise include unlimited automation actions, and the platform has been refined over many years around hand-built flows. If your automation branches on lifecycle stage, deal status, ecommerce events and lead score, you are using the tool the way it was designed to be used. The trade-off is build time: every branch is a decision you make manually.

Mailerflow's automations are visual, with waits, conditions, webhooks and AI steps, and triggers on signups, events, dates, inactivity and website behavior. The AI automation builder takes a sentence and drafts the workflow — trigger, waits, conditions, emails — for you to review before activation.

Take the same job in both tools: a 14-day onboarding sequence that branches on whether the contact opened the first email and visited the pricing page.

• ActiveCampaign: you build the trigger, add the first email, add a wait, add an open-condition split, add a website-visit condition (via site tracking), then write the two branch emails, then rejoin the paths. Roughly 12–15 blocks, all placed by hand.
• Mailerflow: you write something like "On signup, send a welcome email, wait 2 days, then if they opened it and visited /pricing, send a demo offer; otherwise send a case-study email, wait 5 days, then a check-in." The builder drafts that structure. You then fix the copy, adjust the wait lengths and confirm the conditions.

Be honest about what AI drafting is: a starting point, not a substitute for knowing your funnel. It removes the blank canvas, not the thinking. And if your flows are genuinely complex — nested splits, score thresholds, CRM handoffs — the hand-built approach still gives you finer control.

Segmentation and personalization

ActiveCampaign's Pro plan includes advanced segmentation and Enterprise includes premium segmentation; segmentation is a core strength of the platform. If you segment on dozens of attributes and need that to be a first-class part of the UI, that's a genuine advantage.

Mailerflow offers dynamic segments on fields, tags, engagement, events and website behavior, with AI segmentation from a plain-language description, plus AI personalization steps and website-behavior data collected through a JS SDK.

One caveat applies to both: segmentation quality is capped by the data you collect. Tags and custom fields on import, events from your product, behavior from your site — if that data isn't flowing in, no segmentation builder will save you. Sort out data collection first, then compare the interfaces.

Deliverability and sending infrastructure

Mailerflow sends from your own domain with guided DKIM, SPF and DMARC setup and automatic verification, suppresses bounces and complaints automatically, monitors reputation and applies warm-up limits. Every paid plan includes unlimited emails, so there's no incentive to hold back a send.

ActiveCampaign is an established sender with its own infrastructure and deliverability tooling; for specifics, check its official documentation rather than a comparison article.

A checklist that applies to either tool:

1. Authenticate your sending domain (SPF, DKIM, and DMARC once the first two are in place).
2. Clean your list before migrating — remove hard bounces and long-term non-openers.
3. Warm up a new sending domain gradually rather than blasting your full list on day one.
4. Watch bounce and complaint rates weekly; a rising complaint rate is the earliest warning you get.
5. Keep a separate subdomain for transactional mail so a campaign problem never blocks password resets.

Transactional email, API and integrations

Mailerflow's transactional email API runs on a high-priority lane with templates and variables, and the REST API includes scoped keys, idempotency keys, an OpenAPI spec, code samples and a JS SDK. Signed real-time webhooks with retries and delivery logs let your app react to sends, opens and bounces without polling.

curl -X POST https://api.mailerflow.ai/v1/transactional/send \
  -H "Authorization: Bearer $MAILERFLOW_KEY" \
  -H "Idempotency-Key: order-10482-receipt" \
  -H "Content-Type: application/json" \
  -d '{
    "template": "order-receipt",
    "to": "customer@example.com",
    "variables": { "order_id": "10482", "total": "€49.00" }
  }'

ActiveCampaign's verified integration position: Pro includes standard CRM and premium ecommerce integrations, Enterprise includes premium CRM and ecommerce integrations, and it supports Email, WhatsApp or both as channels. Its built-in CRM and integration ecosystem are a real strength for teams that want marketing and sales in one place — that's a genuine reason to stay, not a reason to leave. For anything not listed here, check the official docs.

Support, data location and compliance

ActiveCampaign's Enterprise plan includes a dedicated account team and SSO, and a 30-day money-back guarantee applies across plans.

Mailerflow hosts data in Europe and provides GDPR tools: data export, erasure, consent logs and configurable retention. Signup forms are embeddable with double opt-in and consent records. CSV import checks for duplicates and invalid addresses and maps custom fields and tags, and free migration help covers contacts, suppression lists, templates and core automations on eligible paid plans.

Frame this around constraints, not preferences: where must your data live, what does your legal team need to see, and who answers when something breaks at 2am?

Which one to choose

Choose ActiveCampaign if: you need a mature, hand-built automation engine with unlimited automation actions on Pro and above; you want an integrated CRM with standard or premium ecommerce integrations; advanced or premium segmentation matters to you; you want WhatsApp as a channel; you need SSO and a dedicated account team at Enterprise level; and annual billing suits your budget cycle.

Choose Mailerflow if: you want unlimited emails on every paid plan starting at €9.90/month; you'd rather describe an email or workflow and edit a draft than build from scratch; you need transactional email on a high-priority lane with a documented API and signed webhooks; EU data hosting and GDPR tooling are requirements; and free migration help on eligible paid plans would remove the switching cost.

Still unsure? Run a two-week pilot on one real sequence in both tools. Measure build time, cost at your actual sending volume, and inbox placement. Two weeks of your own data beats any comparison table, including this one.

FAQ

Is Mailerflow cheaper than ActiveCampaign?

Mailerflow's paid plans start at €9.90/month with unlimited emails, and there's a Free plan with 2,500 contacts and 10,000 emails a month. ActiveCampaign prices by contact count and plan tier and bills annually, so the honest answer is that you need to check its official pricing page against your own list size and sending volume.

Can I migrate my ActiveCampaign contacts and automations?

Contacts, suppression lists, templates and core automations can be migrated with free migration help on eligible Mailerflow paid plans. CSV import checks for duplicates and invalid addresses and maps custom fields and tags. Highly custom automations will need rebuilding — that's true of any migration, in either direction.

Does Mailerflow have a CRM?

No. Mailerflow covers email marketing and transactional email. ActiveCampaign includes CRM, with standard CRM integrations on Pro and premium CRM and ecommerce integrations on Enterprise — if marketing and sales need to live in one tool, that's a point in ActiveCampaign's favour.

Can Mailerflow send transactional email?

Yes — a transactional email API on a high-priority lane with templates and variables, plus signed webhooks with retries and delivery logs.

Is there a free plan?

Mailerflow's Free plan includes 2,500 contacts, 10,000 emails a month, 1 domain, 1 user, 3 active automations and 100 AI actions, with Mailerflow branding. Check ActiveCampaign's official pricing page for its current free or trial options.

Where is my data stored?

Mailerflow hosts data in Europe and provides GDPR tools for export, erasure, consent logging and retention. Check ActiveCampaign's official documentation for its data locations.

If you're weighing cost against automation needs, the fastest way to get a real answer is to run one sequence on Mailerflow and compare. Start on the Free plan — 2,500 contacts, 10,000 emails a month, the AI automation builder included — import your contacts by CSV, and ask about free migration help on eligible paid plans. If you want to see what else is in the product first, the feature overview covers automations, segmentation and the transactional API.