Proton
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Product updates

An illustration of Proton Calendar event invitations
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Plan events with friends and colleagues with event invitations in Proton Calendar
You can now send and receive event invitations with Proton Calendar. These invitations work with most popular calendar apps, making it easy to plan events with friends.
An illustration of the Proton Calendar Android app beta.
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Proton Calendar beta is now available on Android devices!
Our privacy-focused, encrypted calendar is now available in beta for Android devices. Here’s how to download the app and start protecting your schedule.
Illustration of link sharing
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Proton Drive now lets you share your files and folders with secure links
Proton Drive lets you share end-to-end encrypted files and folders with secure links.
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Proton Mail now offers Undo Send, letting you cancel outgoing emails
Proton Mail launches Undo Send, a feature that allows a few seconds consideration before an email is sent.
Illustration of Proton Mail in iOS
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Set Proton Mail as the default email client in iOS
iPhone and iPad users can now change their default email app from Apple’s Mail to secure and private Proton Mail.
An illustration of Proton Mail's public keys.
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Proton is secure against batch GCD attacks
The batch GCD algorithm can extract secret keys from large databases of public keys. Proton Mail is secure against this vulnerability.
Proton 4.0 is now in beta
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Proton V4 web beta brings persistent single sign-on in huge step toward full integration
We’re making Proton tools even more seamlessly connected, letting you sign in once to access your inbox, calendar, cloud storage, and more.
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Temporary TLS certificate update for September 2020
Proton Mail has temporarily changed its certificate authority to Let’s Encrypt, a nonprofit certificate authority run by the Internet Security Research Group.
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The Proton Drive security model
Learn how Proton Drive uses end-to-end encryption to protect your photos, documents, and other sensitive data.
An illustration of the multi-account feature for iOS.
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Out of beta: Switch between multiple accounts in Proton Mail iOS
Multi-account support is now available on the new version of Proton Mail iOS. Access all your Proton Mail accounts on the go with your iOS device.
An illustration of the Proton Mail Android app going open source.
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All Proton Mail apps are now open source, as Android joins the list!
Our Proton Mail Android app is open source. We are committed to transparency and contributing to the open source and privacy tech community.