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HetrixTools vs MultiRBL: catalog facts
HetrixTools	MultiRBL
Freemium Free tier with 15 uptime and 32 blacklist monitors; paid plans add more.	Free Free to use, with optional Bitcoin donations.
Web	Web
Generous free tier for uptime and blacklist monitoring Checks from up to 12 locations	Checks over 200 blacklists and whitelists Supports IPv4 and IPv6
Hosted only, with no self-hosted option Requires an account	No help with removal requests Plain interface with lots of technical output
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
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.