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Mailpit vs MailCatcher: catalog facts
Mailpit	MailCatcher
Free Free to download and run.	Free Free and open source under the MIT License.
Web, Self-hosted, Command line	macOS, Linux, Web, Command line
Single binary or Docker image with no dependencies HTML compatibility, link and spam checks built in	Captures email locally for development Shows HTML, plain text, and source views
For testing only, not a real mail client Spam scoring relies on a SpamAssassin setup	Requires Ruby 3.3 or newer Email encoding support is incomplete
Downloadable app, Self-hosted	Downloadable app, Web application
Open source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.