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Proton VPN vs VPN.ac: catalog facts
Proton VPN	VPN.ac
Freemium The free tier has no data cap but limited countries and speeds. Paid plans add more…	Paid Commercial subscription service; the research does not list current prices.
Windows, macOS, Linux, Android, iOS, Browser extension	Windows, macOS, Linux, Android, iOS, Browser extension
A free tier with no data cap and no advertising Clients are open source on every platform and independently audited	Supports WireGuard, OpenVPN and obfuscated protocols Publishes per-location gateway counts and a node status page
An account is required, even for the free tier Free tier covers few countries and slows down at peak times	Paid service with no free tier shown Fewer locations outside Europe and North America in the published list
Downloadable app, Browser extension	Downloadable app, Hosted service, Browser extension
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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