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Kitterman SPF Validator vs DKIM Validator: catalog facts
Kitterman SPF Validator	DKIM Validator
Free Free to use.	Free Free to use.
Web	Web
Uses an RFC 7208 compliant library Tests processing limits such as DNS lookup count	DKIM, SPF and SpamAssassin results in one place Tests real mail flow rather than just DNS records
Cached DNS results can lag recent changes Plain interface aimed at technical users	Test messages are stored on a third-party server Only checks messages you send to it
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account 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 24, 2026

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