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Mailtrap vs Papercut SMTP: catalog facts
Mailtrap	Papercut SMTP
Freemium Self-serve sign-up with published pricing for paid tiers.	Free Free and open source under the Apache-2.0 licence.
Web	Windows, Self-hosted
Captures test emails without reaching real inboxes Previews rendering across 100+ email clients and devices	Catches test emails without sending them Simple desktop interface for reading captured messages
Hosted service only Much of the product focuses on sending email rather than testing	Meant for testing, not a real mail server Desktop app is Windows-only
Web application, Hosted service	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License: Apache-2.0
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.