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Proton VPN vs Calyx VPN: catalog facts
Proton VPN	Calyx VPN
Freemium The free tier has no data cap but limited countries and speeds. Paid plans add more…	Free Free, funded by Calyx Institute members and donations.
Windows, macOS, Linux, Android, iOS, Browser extension	Android
A free tier with no data cap and no advertising Clients are open source on every platform and independently audited	No account needed No logging, according to the provider
An account is required, even for the free tier Free tier covers few countries and slows down at peak times	Only Calyx Institute servers are available Android only
Downloadable app, Browser extension	Downloadable app, Hosted service
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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