Compare software

Calyx VPNProton VPN
Free

Free, funded by Calyx Institute members and donations.

 Freemium

The free tier has no data cap but limited countries and speeds. Paid plans add more…

Android Windows, macOS, Linux, Android, iOS, Browser extension
  • No account needed
  • No logging, according to the provider
  • A free tier with no data cap and no advertising
  • Clients are open source on every platform and independently audited
  • Only Calyx Institute servers are available
  • Android only
  • An account is required, even for the free tier
  • Free tier covers few countries and slows down at peak times
Downloadable app, Hosted service Downloadable app, Browser extension
Open source Open source
License: GPL-3.0 License: GPL-3.0
No account needed Account needed
Needs internet Works offline

Checked October 2, 2026

Checked September 21, 2026

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