iOS Mobile Beta

We are currently transitioning the iOS beta testing from Crashlytics to TestFlight. For more information please follow this link.

We have released the ProtonMail mobile applications in the iOS App store and Android Play store where they can be downloaded for free. However, we are continuing the ProtonMail iOS/Android Beta Program which is detailed here.

  1. Open the message sent from Crashlytics with the subject line: “You’ve been invited to test ProtonMail Mobile.” iOS Crashlytics ProtonMail email
  2. Click on the link in this message that states “Let Me In”. Please use Chrome or Safari browser to open this link.Let me in! ProtonMail iOS Mobile app
  3. Select “Install”Install ProtonMail iOS app


Upon opening the app for the first time you will be prompted with a message “Untrusted Enterprise Developer”. With the release of iOS 9, you will be required to “trust” ProtonMail’s Apple Enterprise developer certificate, one-time, before running the Beta app.


  1. Navigate to Setting (for your iOS device) -> General –> Profiles
    Profiles in General of iOS settings
  2. Select the developer certificate in the “ENTERPRISE APP” section
  3. Press “Trust Proton Technologies AG”.Trust ProtonMail iOS Enterprise app
  4. Select “Trust”



You are now ready to continue testing the ProtonMail iOS beta application.

Thank you for the your continued use of the beta app. We greatly appreciate any feedback you can provide us along the way.


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  1. Julien

    The step 3 is not working.
    I got an error and the page can’t load. One time I add the screen from Crashlytics with my email but got an error after clicking on Next.

    Do you know why ?

    Best Regards,

  2. Fred

    I found it very difficult to open the “let me in” email after I deleted the protonmail app.

  3. Anonymous


    Some issue with the step 3. The URL is not opening inside Safari iOS because the server is unavailable or the connection is impossible.

    How can it be resolved ?

  4. JCA320

    I am unable to install to my iPhone 6. I am running IOS9. After clicking the “let me in” button, the server cannot be found. I have tried it through cell towers and wi-fi. It works fine on my desktop. Anyone care to share ideas?

  5. The Limey B.

    I have been unable to locate any details which specifically state that the App is for iPhones (iOS) only. Does the App function on iPads (Air) also? Has anyone tried it?

  6. Carste

    Can’t get the beta app working on iOS. I’m enrolled in the beta. When I follow the “let me in” link in the beta invite, I can download the Crashlytics Beta app, and Crashlytics shows up in settings -> general. But when it comes to download the beta app, nothing downloads. It just says “Latest release” – “You’re all set for now”. It obviously thinks that I have the beta app, but I doesn’t. Can you help me?

  7. ProtonMail Support

    Please contact us on or via the Report bug button.

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