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Google Postmaster Tools vs GlockApps: catalog facts
Google Postmaster Tools	GlockApps
Free Free to use with a Google account.	Freemium A free spam checker and DNS record checkers are available; full placement testing and…
Web	Web
Shows how Gmail rates your sending domain Free to use	Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score
Requires a Google account Only covers delivery to Gmail	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
Account 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.