Thinking of leaving MailerLite?
MailerLite is a lovely newsletter tool. But once you need transactional email, a proper developer API, or a bill that doesn't grow with every contact, it starts to pinch. Here's an honest look at your options — including where MailerLite is still the right call.
Why people start looking around
MailerLite earns its fans for easy newsletters. The friction tends to show up in three places.
The price keeps creeping up
MailerLite charges by how many contacts you have, so the bill grows as your list does — even for people who never open a thing.
It does not do transactional email
Password resets and receipts run through a second product, MailerSend. That means two tools, two logins, and two invoices for one job.
The API stops at marketing
Great for managing subscribers and campaigns. Not built to be the email engine behind your app once you start shipping software.
The short version
Just the things that actually decide a switch — no 40-row feature matrix.
| Lettr | MailerLite | Brevo | Resend | |
|---|---|---|---|---|
| Transactional email | Built in | Separate product | Included | Core product |
| Marketing campaigns | Built in | Strong | Included | Basic only |
| Both on one bill | Yes | No — two products | Yes | Mostly transactional |
| Developer API | Full, with SDKs | Marketing only | Full | Excellent |
| Per-email analytics | Every message | Campaign level | Campaign level | Aggregated |
| Pricing | Per email & contact | Per subscriber | Per email | Per email |
Based on publicly documented features and pricing as of 2026; details change. See the full Lettr vs Resend breakdown for more.
A quick, honest take on each
No tool wins for everyone — ours included. Here's where each one shines and where it doesn't.
Lettr
Our pickTransactional and marketing email in one place, with a real API.
MailerLite
Still lovely for newsletters, landing pages, and simple automations.
Brevo
An all-in-one with marketing, transactional, SMS, and a light CRM.
Resend
A clean, modern email API that developers genuinely enjoy.
The reason most switchers land on Lettr is simple: it sends your transactional and marketing email from one platform — a clean developer API for engineers, a drag-and-drop editor for everyone else, and per-email analytics so you can see exactly what landed. No MailerSend on the side.
Switching is mostly a settings change
Moving off MailerLite — and MailerSend — doesn't mean rewriting anything. Point your app at Lettr and you're sending in minutes, with no downtime.
- 01 Drop in your Lettr key — API or SMTP, whichever you use.
- 02 Verify your domain with the guided SPF, DKIM & DMARC wizard.
- 03 Bring your templates over — rebuild in the editor or paste your HTML.
The short version: your sending code stays the same. One set of credentials now covers both transactional and marketing, you retire the second MailerSend bill, and every message shows up in one dashboard.
Need help deciding?
Talk to our team about your email infrastructure, volume needs, or migration from another provider.
Talk to an expertA few common questions
Both kinds of email, one place.
Replace MailerLite and MailerSend with a single tool — real API, per-email analytics, free to start, no credit card.