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HetrixTools vs MXToolbox Blacklist Check: catalog facts
HetrixTools	MXToolbox Blacklist Check
Freemium Free tier with 15 uptime and 32 blacklist monitors; paid plans add more.	Free The blacklist check is free to use on the website.
Web	Web
Generous free tier for uptime and blacklist monitoring Checks from up to 12 locations	Checks over 100 DNSBLs in one pass Accepts an IP address or a domain
Hosted only, with no self-hosted option Requires an account	Covers fewer lists than some dedicated multi-RBL tools Shows listings but does not remove them
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is 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.