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Papercut SMTP vs Mailtrap: catalog facts
Papercut SMTP	Mailtrap
Free Free and open source under the Apache-2.0 licence.	Freemium Self-serve sign-up with published pricing for paid tiers.
Windows, Self-hosted	Web
Catches test emails without sending them Simple desktop interface for reading captured messages	Captures test emails without reaching real inboxes Previews rendering across 100+ email clients and devices
Meant for testing, not a real mail server Desktop app is Windows-only	Hosted service only Much of the product focuses on sending email rather than testing
Downloadable app, Self-hosted	Web application, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Works offline	Needs internet
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.