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NightbellHetrixTools
Free

Free and open source under the Apache 2.0 licence.

 Freemium

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

Android Web
  • No server or account needed
  • Tokens and history stay on the device
  • Generous free tier for uptime and blacklist monitoring
  • Checks from up to 12 locations
  • Checks only run while the phone is on and connected
  • Not available on Google Play
  • Hosted only, with no self-hosted option
  • Requires an account
Downloadable app Web application, Hosted service
Open source Closed source
License: Apache-2.0 License not stated
No account needed Account needed
Not stated if it works offline Needs internet

Checked October 2, 2026

Checked September 23, 2026

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