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HELO vs Inbucket: catalog facts
HELO	Inbucket
Paid Sold as a paid desktop application.	Free Free and open source under the MIT licence.
macOS	Windows, Linux, Self-hosted
Local SMTP server that catches mail before it reaches real users Automatic broken link check	Accepts mail for any address without setup Web interface plus SMTP and POP3
Paid only Laravel Herd Pro now includes its own email testing tool, which overlaps for PHP users	Meant for testing, not for real mail delivery You run and maintain the server yourself
Downloadable app	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License: MIT
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 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.