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

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