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Mail Tester vs GlockApps: catalog facts
Mail Tester	GlockApps
Free Running a test from the website is free.	Freemium A free spam checker and DNS record checkers are available; full placement testing and…
Web	Web
No setup beyond sending one email to a given address Simple score out of 10 that is easy to read	Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score
Tests a single message rather than ongoing deliverability Little detail on the homepage about what each check covers	Full seed-list testing requires a paid plan Aimed at bulk and marketing senders more than individuals
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.