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  1. Proton: Privacy by default

    Proton was started in 2014 by scientists who met at CERN and shared a vision of an internet that defends freedom and puts people first. Our transparency, open-source software, and rigorous …

  2. Download all Proton apps

    Download Proton Mail, Proton Calendar, Proton VPN, and Proton Drive for your device (Android, iOS, Windows, macOS, or Linux).

  3. Proton Account: Sign-in

    Sign in to your Proton Account to access all encrypted Proton services such as Proton Mail, Drive, Calendar, and more. Don't have an account? Create one for FREE.

  4. Proton AG - Wikipedia

    Proton AG is a Swiss technology company offering privacy -focused online services and software. It is majority owned by the non-profit Proton Foundation. [5]

  5. Download VPN | Proton VPN

    To start using Proton VPN, sign up for free or buy a paid Proton VPN Plus account. With our paid plans, you can use Proton VPN on up to 10 devices at the same time, connect to over 15000 high-speed …

  6. Proton | Definition, Mass, Charge, & Facts | Britannica

    Dec 7, 2025 · Proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 x 10^-27 kg, which is 1,836 times the mass of an electron.

  7. Proton Mail

    Proton Mail is based in Switzerland and uses advanced encryption to keep your data safe. Apps available for Android, iOS, and desktop devices.