Screen not loading in iPhone (iOS) (“Absolute Security – requires modern web browser”)

The Safari browser is often set to “Private” browsing mode by default, you can learn how to disable Private Mode on Safari here: ProtonMail uses a critical technology (sessionStorage) that is disabled when this mode of browsing is activated.

If you are experiencing trouble viewing accessing ProtonMail on your iOS device, please ensure that you are not browsing on the “Private” mode (

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  1. Bluestreak

    No Protonmail access from Windows Phone software version 7.5 either. Security certificate validity warning with Mobile Explorer 9. You can advance through the first login step, but not to the second decrypt mailbox step. Phone = Nokia Lumia 710

  2. JD

    sessionStorage doesn’t work on Safari on OS X either when you use a Private Window. But how secure is sessionStorage? In light of the fact ProtonMail is intended for increased security, one would expect the security implications of sessionStorage to be fully explained. And yes, I am away that the REASON ProtonMail uses sessionStorage is so that the user doesn’t have to input their Mailbox password every time they read or send mail. But the fact remains that it would be safer to use a Private Window in Safari, and some people may not mind entering their password multiple times (especially those of us who use password managers) so as to have increased security.

  3. Tom

    I don’t have private browsing switched on, on my iPad and yet just get a grey screen when I try to log on…

  4. Donna kollmar

    I am not computer literate and front know why I cannot login to my account. On my CELL PHONE

  5. ProtonMail Support

    Please contact us at

  6. Tommy Shorter

    Can not open my email…!!!

  7. ProtonMail Support

    Please contact our support team at or using the support form at

  8. Marianne Abels

    I can’t open my account. Fingerprint stopped working on iPhone . Password is not working, recovery email is not recognised. Can’t change password. Nothing. Kafka at work. Please tell me what to do

  9. ProtonMail Support

    Please contact our support team:

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