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GlockApps vs Kitterman SPF Validator: catalog facts
GlockApps	Kitterman SPF Validator
Freemium A free spam checker and DNS record checkers are available; full placement testing and…	Free Free to use.
Web	Web
Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score	Uses an RFC 7208 compliant library Tests processing limits such as DNS lookup count
Full seed-list testing requires a paid plan Aimed at bulk and marketing senders more than individuals	Cached DNS results can lag recent changes Plain interface aimed at technical users
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No 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.