Quick answer
MailerSend - MailerSend wins for most builders who want a simple email-sending free tier, while Mailtrap wins if you need testing sandboxes and QA workflow alongside sending.
How the free tiers compare
MailerSend and Mailtrap overlap on email sending, but they serve different builder jobs. MailerSend is narrower and more sender-focused: the free tier is small, but the product is clearly built around transactional email, SMTP, templates, verification, and sender management. Mailtrap is broader in the email lifecycle, splitting its value between Email API/SMTP for production sending and an Email Sandbox for dev and QA. That makes Mailtrap better if you need to test messages before they hit real inboxes or if your team cares about logs, users, and domain management from the start. MailerSend is lighter and cheaper at the entry paid level, with the first paid tier at $5.60/month versus Mailtrap’s $15/month. Mailtrap’s free tier gives more breathing room on send volume, but MailerSend’s product shape is more focused for builders shipping email features fast.
MailerSend vs Mailtrap free tier, side by side
| MailerSendFTV 37 | MailtrapFTV 37 | |
|---|---|---|
| Free emails/monthMailtrap’s free sending limit is for its Email API/SMTP free plan. | 500 | 4,000 |
| Free email verification creditsMailerSend includes verification credits on the free plan. | 10 | Not listed |
| Free domainsMailtrap’s free plan explicitly includes 1 domain. | Not listed | 1 |
| Free log retentionMailtrap lists email log retention on the free tier. | Not listed | 3 days |
| Free seats/usersMailerSend’s free plan does not state a seat count in the provided input. | Not listed | 1 user account |
| Free send limit per dayMailtrap also caps the free plan at 150 emails/day. | Not listed | 150 emails/day |
| Cheapest paid planBoth are flat-priced first paid tiers. | Hobby at $5.60/month | Basic at $15/month |
After you outgrow the free tier
MailerSend’s paid ladder starts lower and stays flat-priced: Hobby at $5.60/month, then Starter at $28/month and Professional at $88/month. Mailtrap also uses flat pricing for its main plans, but its entry point is higher at $15/month, then rises to $85, $200, $300, $450, and $750/month across larger tiers. For small builders, MailerSend is the cheaper step after free. Mailtrap becomes the pricier option sooner, but it offers much larger sending and broader account/log limits as you scale.
Cost at real usage
| Usage | MailerSend | Mailtrap |
|---|---|---|
| 4,000 emails/moMailtrap free tier covers this volume, but MailerSend free does not. | Not enough quota on free; next paid starts at $5.60/mo | Free (within tier) |
| 5,000 emails/moMailtrap’s free plan caps at 4,000 emails/month, so 5,000 needs paid. | Hobby - $5.60/mo | Basic - $15/mo |
| 50,000 emails/moMailerSend Starter includes 50,000 emails/month; Mailtrap’s Basic is too small. | Starter - $28/mo | Business - $85/mo |
| 100,000 emails/moMailtrap’s 100,000-email tier is priced slightly below MailerSend’s Professional. | Professional - $88/mo | Business - $85/mo |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick MailerSend when…
- You are sending low-volume production emails and want the simplest paid step up from free.
- You need email verification credits bundled with sending.
- You want a drag-and-drop email builder on the free tier.
- You are working solo or with a small team and care more about transactional email than QA tooling.
Pick Mailtrap when…
- You need to test emails in staging or QA before sending to real users.
- You want a free plan with higher monthly send volume than MailerSend’s 500 emails/month.
- You need a sandbox workflow for inspecting headers and message content.
- You expect to grow into more users, domains, and log retention around an email ops workflow.
Bottom line
For the most common builder use case, MailerSend is the better pick if you mainly need to send email and want the cheapest clean step up from free. Its free tier is smaller, but the product is more directly centered on transactional email, verification, and templates. Mailtrap is the better choice when your real need is email testing plus sending, especially if you want a sandbox for staging and QA. If you are choosing only one free tier for production email, MailerSend is the simpler first move.
Read the full listings: MailerSend and Mailtrap. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.