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Blackbox ExporterHetrixTools
Free

Free and open source, part of the Prometheus project.

 Freemium

Free tier with 15 uptime and 32 blacklist monitors; paid plans add more.

Linux, Self-hosted Web
  • Probes over several protocols including ICMP and gRPC
  • Official Prometheus project with regular maintenance
  • Generous free tier for uptime and blacklist monitoring
  • Checks from up to 12 locations
  • Needs Prometheus to collect and store results
  • No interface of its own beyond a basic status page
  • Hosted only, with no self-hosted option
  • Requires an account
Downloadable app, Self-hosted Web application, Hosted service
Open source Closed source
License not stated License not stated
No account needed Account needed
Not stated if it works offline Needs internet

Checked September 24, 2026

Checked September 23, 2026

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