How to Choose an Email Tool for Your SaaS

A scorecard for two finalists

Choosing a tool is easier when the criteria are fixed before you see any demo. Give each finalist a score from one to five on the five rows below, weight the rows by what your product depends on, and add them up. The numbers are your own judgement; the value is that two people on the team can disagree about a row instead of about a feeling.

How should the rows be weighted?

A product team with event-driven emails should weight the automation row highest; a newsletter team should weight import and build effort.

What if the finalists tie?

Choose the one with the cleaner export, because that is the cheapest decision to reverse.

Billing units decide the shortlist before features do

Three vendors can quote you three prices for the same list because each one counts something different. Mailchimp prices Standard by contacts, with $20 at 500. Resend prices its transactional Pro plan by emails, at $20 for 50,000 a month. Loops is free for the 1,000 newest contacts and scales by subscribers after that.

Before comparing any two numbers, write the unit next to each: contacts, emails, profiles or seats. A mailing that goes to a small list many times a month favours per-email billing; a large, quiet list favours the reverse, and a product with many users but few emails per user usually fits neither without a calculation.

How do I convert one unit to another?

Multiply your contact count by the number of sends you expect per contact each month, and use that email total as the common figure for every candidate.

Which of the three categories do you need first?

The shortlist at the top of this guide splits tools into newsletter editors, behavioural lifecycle platforms and transactional APIs. Most products need all three eventually, but the order matters, because the first purchase shapes where your contacts and consent records live.

Can one vendor cover all three?

Brevo and SendGrid both describe themselves as covering marketing and transactional sending, so they are the natural pilots for a team that wants one vendor; confirm in the trial that the separate streams behave as the vendor's page describes.

Who will operate the tool matters as much as the tool

A founder who writes the product emails on a Sunday evening needs a different tool from an engineering team that wants templates in a repository. Describe the real operator in one sentence before you read any pricing page: for example, a marketer with no developer time, or a developer with no marketing background. Then discard every candidate whose day-one setup assumes the other person.

Developer-owned options such as Resend, Postmark, Mailgun and Amazon SES reward someone who is comfortable with DNS records, webhooks and logs. Editor-first options such as MailerLite, Mailchimp and Kit reward someone who would rather drag blocks than write code. The mismatch is expensive in both directions, because a good tool in the wrong hands is simply left half-configured.

What if both kinds of people work on email?

Then split the stack along the same line: engineers own the transactional sender, and the marketer owns the campaign tool, with a shared list of who may email whom.

Questions to put to a vendor whose price is a quote

Some entries on this page do not publish a flat price you can read off a slider; the Customer.io and HubSpot profiles above both tell you to ask for a quote or calculator estimate rather than read a flat figure. When you ask, send the same four facts to every vendor so the answers are comparable: your contact or profile count today, your expected count in twelve months, your monthly email volume, and the channels you will use.

Should I ask for the answer in writing?

Yes, because a quote in an email thread is something you can attach to the decision record later.

Why "free" is a trial, not an architecture

A free plan is a good way to run the scorecard, and several vendors publish one: Kit is free up to 10,000 subscribers, Brevo lists Free at 300 sends a day, and Resend's transactional Free plan covers 3,000 emails a month. Those limits are on the vendors' own pricing pages, which are linked from the profiles above.

The risk is the cliff at the edge of the free plan. If the feature you rely on, such as a second automation or a branded sender, is on the paid tier, the free plan has told you something useful about the tool and nothing about its eventual cost. Price the plan you would actually buy, and use the free one only to find out whether you like the editor.

When should I move off the free plan?

When a limit starts to shape what you send, for example when you split a mailing across days to stay under a daily cap.

Reading the exit terms before you read the feature list

The cheapest way to protect a tool choice is to learn how you would leave. For each finalist, find out in the trial whether you can export contacts with their subscribed status and the date of consent, whether templates leave as HTML you can reuse, and whether automations can be exported at all or must be rebuilt by hand.

Write the answers in the scorecard next to the price. A tool that exports a clean contact file and plain HTML templates is close to a monthly rental, and you can choose it on a smaller evidence base. A tool that locks consent history inside its own interface deserves a longer pilot and a monthly rather than annual commitment.

Is the export test worth doing in a trial?

Yes. Click export on day one; if the file is missing the unsubscribed column, you have found the problem when it costs nothing.