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LearnDMARC vs DKIM Validator: catalog facts
LearnDMARC	DKIM Validator
Free Free to use; the site is sponsored by a DMARC monitoring service.	Free Free to use.
Web	Web
Tests a real message sent from your own mail setup Step-by-step visual explanation of alignment	DKIM, SPF and SpamAssassin results in one place Tests real mail flow rather than just DNS records
Full visual view needs a desktop screen Aimed at explaining one message rather than monitoring a domain	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.