Compare software

Fort FirewallGlassWire
Free

Free and open source.

 Freemium

A free version is available. Longer history and extra features require a paid licence.

Windows Windows, Android
  • Per-application and global network rules
  • Wildcards and parent-process based rules
  • Visual history makes it obvious which application started talking and when
  • Alerts on first connections and on changes to system network settings
  • Windows only
  • Requires familiarity with firewall rules
  • Longer history retention and several features need a paid licence
  • Windows and Android only, closed source
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 24, 2026

Checked September 22, 2026

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