When is Mailtrap the better choice?

You need an email sandbox for staging, QA, or checking raw message content and headers before real delivery. You want a little more free sending volume, since Mailtrap includes 4,000 emails per month and 150 per day. You only need one user and a very small team workflow on the free plan. You care more about testing plus basic transactional sending than about automation runs or React Email. You want a simple flat-fee upgrade path once you exceed the free cap.

When is Resend the better choice?

You want a developer-first email API with REST, SMTP relay, official SDKs, and React Email support on the free plan. You need tracking, scheduled emails, batch sending, webhooks, and receiving included before paying. You expect to use automation runs or AI credits and want those counted in the free tier. You prefer a free tier with 30 days of data retention instead of Mailtrap’s 3 days of logs. You want a paid model that starts low and scales by usage, with extra emails billed separately.

Mailtrap vs Resend: Free Tier Comparison

Q: How much does Mailtrap cost after the free tier?

Basic - $15 /month. Mailtrap’s paid path is flat-priced: Basic starts at $15/month, then Business tiers step up to $85, $200, $300, $450, and Enterprise at $750/month. Resend starts at $20/month for Pro and $90/month for Scale, but the plans are usage-based with extra emails billed at $0.90 per 1,000. That means Mailtrap is easier to predict as volume grows, while Resend can be cheaper at low paid usage but becomes less fixed once you go beyond included email quota. Mailtrap is the cheaper first upgrade; Resend becomes more attractive if you value included developer features and expect to scale usage incrementally.

Q: How much does Resend cost after the free tier?

Pro - $20 / mo. Mailtrap’s paid path is flat-priced: Basic starts at $15/month, then Business tiers step up to $85, $200, $300, $450, and Enterprise at $750/month. Resend starts at $20/month for Pro and $90/month for Scale, but the plans are usage-based with extra emails billed at $0.90 per 1,000. That means Mailtrap is easier to predict as volume grows, while Resend can be cheaper at low paid usage but becomes less fixed once you go beyond included email quota. Mailtrap is the cheaper first upgrade; Resend becomes more attractive if you value included developer features and expect to scale usage incrementally.

Quick answer

Resend - Resend wins for most builders who want a developer-friendly email free tier, while Mailtrap is the better pick if you need more generous free sending volume and email-testing workflows in one place.

How the free tiers compare

Mailtrap and Resend both start as capped free tiers for developers, but they optimize for different jobs. Mailtrap’s free plan is more about stretching a small sending workload and testing emails in staging or QA, with one sandbox, 4,000 monthly emails, 150 per day, and short log retention. Resend’s free plan is more clearly shaped around an API-first sending workflow: 3,000 emails per month, 100 per day, 30 days of retention, React Email, tracking, webhooks, and even 10,000 automation runs. So Mailtrap gives you a bit more raw sending capacity and explicit sandbox tooling, while Resend gives you a cleaner developer stack and more included workflow features. Once you outgrow free, Mailtrap moves into flat-priced tiers, while Resend uses usage-based plans with extra-email charges, so Resend can stay cheaper at light paid usage but grows more variable as volume climbs.

Mailtrap vs Resend free tier, side by side

	MailtrapFTV 37	ResendFTV 30
Monthly email sendingMailtrap includes more free monthly sending.	4,000 emails/month	3,000 emails/month
Daily send limitBoth free tiers are capped daily.	150 emails/day	100 emails/day
Custom domainsFree plan parity on domain count.	1 domain	1 custom domain
Email log / data retentionResend keeps data longer on free.	3 days of email logs	30 days of data retention
Team accessDo not assume a multi-user limit for Resend from this input.	1 user account access	Not specified in the provided free tier items
Testing / sandboxMailtrap is explicitly stronger for QA-style email testing.	1 sandbox included, 10 emails per sandbox, 50 test emails per month	Not listed as a sandbox; sending and receiving are included
Automation runsThis is a notable included workflow feature on Resend.	Not listed	10,000 automation runs
AI creditsIncluded on Resend free.	Not listed	5 AI credits per month

After you outgrow the free tier

Mailtrap’s paid path is flat-priced: Basic starts at $15/month, then Business tiers step up to $85, $200, $300, $450, and Enterprise at $750/month. Resend starts at $20/month for Pro and $90/month for Scale, but the plans are usage-based with extra emails billed at $0.90 per 1,000. That means Mailtrap is easier to predict as volume grows, while Resend can be cheaper at low paid usage but becomes less fixed once you go beyond included email quota. Mailtrap is the cheaper first upgrade; Resend becomes more attractive if you value included developer features and expect to scale usage incrementally.

Mailtrap next stepBasic - $15 /monthFlat monthly

Resend next stepPro - $20 / moUsage-based

Cost at real usage

Usage	Mailtrap	Resend
50,000 emails/monthResend Pro includes 50,000 emails/month.	Not available in the provided Mailtrap plans	$20/mo
100,000 emails/monthResend Scale includes 100,000 emails/month.	Not available in the provided Mailtrap plans	$90/mo
60,000 emails/monthResend Pro base $20/mo plus 10,000 extra emails at $0.90 per 1,000 = about $9 extra.	Not available in the provided Mailtrap plans	~$29/mo est.
120,000 emails/monthResend Scale base $90/mo plus 20,000 extra emails at $0.90 per 1,000 = about $18 extra.	Not available in the provided Mailtrap plans	~$108/mo est.

Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.

When to pick each one

Pick Mailtrap when…

You need an email sandbox for staging, QA, or checking raw message content and headers before real delivery.
You want a little more free sending volume, since Mailtrap includes 4,000 emails per month and 150 per day.
You only need one user and a very small team workflow on the free plan.
You care more about testing plus basic transactional sending than about automation runs or React Email.
You want a simple flat-fee upgrade path once you exceed the free cap.

Pick Resend when…

You want a developer-first email API with REST, SMTP relay, official SDKs, and React Email support on the free plan.
You need tracking, scheduled emails, batch sending, webhooks, and receiving included before paying.
You expect to use automation runs or AI credits and want those counted in the free tier.
You prefer a free tier with 30 days of data retention instead of Mailtrap’s 3 days of logs.
You want a paid model that starts low and scales by usage, with extra emails billed separately.

Bottom line

For the most common builder use case, Resend is the better default if you want a modern API email stack with useful free-tier workflow features and a clear path into paid usage. Mailtrap wins if your immediate need is email testing plus a slightly larger free sending allowance. If you are choosing strictly on free tier shape, Mailtrap is more generous on raw send volume, but Resend is broader for product integration and day-to-day developer workflow.

Read the full listings: Mailtrap and Resend. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.