Mailtrap vs Resend: Pricing Comparison 2026

Mailtrap and Resend both sell transactional email to developers, but they price it differently. Resend publishes flat tiers: Free, Pro at $20/month, Scale at $90/month. Mailtrap's Email API/SMTP tiers are volume banded, so Basic is $15/month at 10K emails and climbs toward $30 near 100K, while Business starts at $85/month at 100K. At low volume the two land within a few dollars of each other; the difference shows up when you model a specific monthly send rather than comparing headline prices. The real separator is the sandbox. Mailtrap's Email Sandbox is a distinct product (from $17/month) that captures outbound mail in staging and CI so nothing reaches a real inbox during testing. Teams that have been burned by a test job emailing production users tend to weight this heavily. Resend has no equivalent, so you would build that safety net yourself or route staging through a catch-all. Counting against Mailtrap: three products on one pricing page means three subscriptions if you want API sending plus Sandbox plus Marketing, and log retention is short at the bottom (3 days on Free, 5 on Basic) where Business reaches 15 days. Resend is the simpler purchase and the easier one to forecast. Pick Resend if you want one clean sending product with a predictable bill. Pick Mailtrap if the staging sandbox or the multi-domain allowance is worth managing volume bands for.