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GlockApps vs Google Postmaster Tools: catalog facts
GlockApps	Google Postmaster Tools
Freemium A free spam checker and DNS record checkers are available; full placement testing and…	Free Free to use with a Google account.
Web	Web
Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score	Shows how Gmail rates your sending domain Free to use
Full seed-list testing requires a paid plan Aimed at bulk and marketing senders more than individuals	Requires a Google account Only covers delivery to Gmail
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account 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.