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MailCatcher vs smtp4dev

The same facts for both, read from GitHub every night, and the relation a person reviewed.

MailCatchersmtp4dev
LanguageRubyC#
LicenceMITBSD-3-Clause
Stars6.8k4k
Latestv0.10.03.15.0
Last push2026-09-162026-10-05
Release cadencetoo few releasestoo few releases
Active contributors3 commit authors on the default branch in the last 90 days4 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Mailtrap. Alternatives to Mailtrap →

    PartialMailCatcherA local SMTP server and web inbox for development; no API checks or sending service.

    Partialsmtp4devThe email sandbox only, with a web inbox, IMAP access and relay rules; no sending service.