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