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Proton VPN vs AdGuard VPN: catalog facts
Proton VPN	AdGuard VPN
Freemium The free tier has no data cap but limited countries and speeds. Paid plans add more…	Freemium Free plan with 3 GB of traffic per month; paid plans remove the limit.
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	Free tier usable without paying More than 75 server locations
An account is required, even for the free tier Free tier covers few countries and slows down at peak times	Free tier capped at 3 GB per month Proprietary service
Downloadable app, Browser extension	Downloadable app, Hosted service, Browser extension
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Not stated if an account is 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.