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Kitterman SPF Validator vs GlockApps: catalog facts
Kitterman SPF Validator	GlockApps
Free Free to use.	Freemium A free spam checker and DNS record checkers are available; full placement testing and…
Web	Web
Uses an RFC 7208 compliant library Tests processing limits such as DNS lookup count	Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score
Cached DNS results can lag recent changes Plain interface aimed at technical users	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
No 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.