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Mailtrap vs smtp4dev: catalog facts
Mailtrap	smtp4dev
Freemium Self-serve sign-up with published pricing for paid tiers.	Free Free to download, with the source code published on GitHub.
Web	Web, Self-hosted
Captures test emails without reaching real inboxes Previews rendering across 100+ email clients and devices	Captures outgoing email so test messages never reach real inboxes Web interface for inspecting captured messages
Hosted service only Much of the product focuses on sending email rather than testing	Meant for development and testing, not for sending real mail Documentation lives mainly in the repository
Web application, Hosted service	Downloadable app, Self-hosted
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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