Which email automation tools earn their keep

What to take away

Keep the pilot evidence beside the contract so a reviewer can reproduce the decision without you.

Start with the billing unit

Six platforms cover most of this market, and they do not charge the same way. Klaviyo bills on active profiles with a monthly send allowance. Mailchimp bills on contacts and counts sends against a plan limit.

HubSpot sells seats and marketing contacts on tiered bundles. Braze prices on monthly active users under an annual contract. Customer.io charges by profiles plus monthly tracked users. ActiveCampaign bills on contacts and adds seat tiers.

That difference matters more than any feature grid. A list of 200,000 dormant contacts costs little on a send-based plan and a fortune on a profile-based one. Email automation pricing punishes whichever number you let grow.

Prices below are published entry tiers and typical contract ranges, not quotes. Ask each vendor for the tier above your projected list size.

What each tool is actually good at

Klaviyo earns its keep for ecommerce. Purchase history, browse events and predicted lifetime value sit inside the flow builder, so a post-purchase sequence can branch on what someone bought. Suits stores with real order volume; weak if you sell nothing.

Mailchimp is the general-purpose default. Its journey builder handles welcome, onboarding and re-engagement without much setup, and the free tier covers small lists. Suits businesses that need one tool for campaigns and automation together.

HubSpot ties email to a CRM record. Lifecycle stage changes fire workflows, and sales tasks land in the same timeline. Suits teams where marketing and sales share one pipeline, and it is the most expensive of the six at scale.

Braze handles cross-channel orchestration at volume. Its canvas tool manages frequency across email, push and in-app, which matters once you send to millions. Suits enterprise teams with engineering support and an annual budget.

Customer.io is event-driven. Any product event can start a journey, and the API is the point rather than an add-on. Suits SaaS companies whose triggers come from application data.

ActiveCampaign sells automation depth at mid-market prices. Conditional logic, lead scoring and lightweight CRM sit in one place. Suits small teams that want branching without an enterprise contract.

For transactional mail, Amazon SES charges $0.10 per 1,000 emails and Postmark starts at $15 a month for 10,000. Neither runs marketing journeys, so most teams keep one of them beside the platform above.

Test the journey, not the feature list

Build one welcome sequence and one win-back sequence in each shortlisted tool. Use real contacts, including a suppressed address, a duplicate, and someone who unsubscribed mid-flow.

Watch what happens when an event arrives late or twice. Google Cloud's Pub/Sub subscription overview documents at-least-once delivery without ordering guarantees, which is the honest default for most event pipelines. If a tool cannot deduplicate or handle out-of-order events, your trigger logic will fire the wrong message.

Amazon SES publishes events to Amazon SNS:

Ask whether the tool preserves those raw records and the identifiers needed to reconcile them. Review the common email automation questions teams raise about event data before you commit.

Deliverability is a separate test. All six platforms require you to authenticate a sending domain with SPF and DKIM records before you send from it.

Since February 2024, Google and Yahoo bulk sender rules also require DMARC and one-click unsubscribe for anyone sending 5,000 or more messages a day to their users.

Score the exit before the entry

Exit cost separates a tool that earns its keep from one that traps you. Ask for the export before the pilot, not after the invoice.

Where the evidence lives

The GOV.UK technology selection guidance asks buyers to weigh adaptability, data control, security review and total ownership cost. Those questions apply to email platforms even though the guidance was written for public services.

The GOV.UK open standards guidance links open standards to interoperability and reduced supplier dependence. Test whether your event definitions and contact data can move between tools. Teams that document these habits build email automation best practices that survive a vendor switch.

Common questions

Is one email automation tool enough?

Usually not. Most teams end up with a campaign platform plus a transactional sender, because the two have different reliability needs. Map which system owns each trigger before you consolidate.

Should the tool with the most features win?

No. Prefer the smallest stack that meets your requirements, then check the billing unit against your list growth. A cheaper tool that charges per profile can cost more than a premium one that charges per send.

What should a pilot prove?

Success, failure, recovery, export and deletion, run by the people who will own it. Use realistic data, including suppressed and duplicate contacts, and write down what happened.

How do we compare prices fairly?

Convert every quote to cost per thousand contacts per month at your current list size and your projected size in twelve months. Ask each vendor for that number in writing, since published tiers change.