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