Their apps are open source (and audited) and work across all the major platforms, but very interestingly they also have a proper native Linux app (not just a CLI version). Their paid tier that gets you around Netflix, Amazon Prime, Disney+, etc and is a few dollars per year cheaper than ExpressVPN. But they have a free tier too that anyone can use, which has a few feature limitations, but is great if you want to test the service, or just want a trusted basic secure VPN.
Full features include Netshield Ad-blocker, quick connect, kill switch, secure core, DNS leak protection, IPv6 leak protection, access to their P2P, Tor, and streaming servers. There is still the CLI option for those wanting to use minimal system resources.
Proton Technologies is not hidden behind a shell company based offshore in a suspicious jurisdiction. They are not only incorporated in Switzerland, but also headquartered there, and the bulk of their engineering team lives and works there. Switzerland is not only a country with strong privacy rights, but also a country with a strong rule of law and is part of the European Single Market. This means that, unlike other VPN companies, they can actually be held legally accountable for breaches in user privacy or false advertising. Under the EU’s General Data Protection Regulation (which they are obligated to comply with), breaching user privacy can lead to fines of up to €20 million. Unauthorized sharing of user data with third parties like foreign intelligence agencies is also a criminal offence under article 271 of the Swiss Criminal Code.
See ProtonVPN: Secure and Free VPN service for protecting your privacy
ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.