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Mailtrap vs HELO: catalog facts
Mailtrap	HELO
Freemium Self-serve sign-up with published pricing for paid tiers.	Paid Sold as a paid desktop application.
Web	macOS
Captures test emails without reaching real inboxes Previews rendering across 100+ email clients and devices	Local SMTP server that catches mail before it reaches real users Automatic broken link check
Hosted service only Much of the product focuses on sending email rather than testing	Paid only Laravel Herd Pro now includes its own email testing tool, which overlaps for PHP users
Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it 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.