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GlockApps vs MXToolbox DKIM Lookup: catalog facts
GlockApps	MXToolbox DKIM Lookup
Freemium A free spam checker and DNS record checkers are available; full placement testing and…	Free The DKIM lookup is free to use on the website.
Web	Web
Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score	Accepts two input formats for domain and selector Explains how DKIM record lookups work on the page
Full seed-list testing requires a paid plan Aimed at bulk and marketing senders more than individuals	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
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.