Proton Mail

Proton Mail is a Swiss end-to-end encrypted email service launched in 2014 and operated by Proton AG, which also operates Proton VPN, Proton Drive, Proton Calendar, Proton Pass, and Proton Wallet. Proton AG is owned by the non-profit Proton Foundation, emphasizing privacy and security in online services. Proton Mail uses client-side encryption to protect email content and user data before they are sent to Proton Mail servers, unlike other common email providers such as Gmail and Outlook.com. The service is hosted in data centers maintained by Proton AG in Switzerland, Germany, and Norway. As of April 2023, Proton Mail has over 100 million users. The source code for the web interface, iOS and Android apps, and the Proton Mail Bridge app is open-source, allowing independent security experts to analyze it. Proton Mail has received positive reviews for its security features and user interface, earning awards such as the Lovie Awards in 2016 and 2017.