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LearnDMARC vs MXToolbox DKIM Lookup: catalog facts
LearnDMARC	MXToolbox DKIM Lookup
Free Free to use; the site is sponsored by a DMARC monitoring service.	Free The DKIM lookup is free to use on the website.
Web	Web
Tests a real message sent from your own mail setup Step-by-step visual explanation of alignment	Accepts two input formats for domain and selector Explains how DKIM record lookups work on the page
Full visual view needs a desktop screen Aimed at explaining one message rather than monitoring a domain	You need to know the selector in advance Tests the published key only, not a signed message
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 23, 2026

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