How can I become a beta tester for iOS?

Thank you for your interest in testing the beta version of Threema.

In order to participate in the beta program, it’s required that you have purchased the regular app version in the App Store.

Please note: The beta version can contain bugs, and data loss might occur. Be sure to create a backup before installing the beta version!

To provide feedback, please contact us directly via Threema (“Settings > Beta Feedback”). TestFlight feedback has been deactivated, as we cannot contact testers there if we have questions about their feedback.

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If you have accidentally answered “No” when asked whether you want to allow Threema to access your photos, you can grant permission as here:

  • iOS Settings > Privacy > Photos > Threema

If Threema is not listed in the location mentioned above, please remove restrictions for Threema:

  • iOS 12: iOS Settings > Screen Time > Restrictions > Photos > Allow Changes
  • iOS 11 and earlier: iOS Settings > General > Restrictions > Photos > Allow Changes
In some cases (e.g., when the memory usage is high or the battery level low), incoming push notifications can’t be decrypted in the background. In these rare cases, a generic notification (“Message” or “Group Message”) will be displayed.

There are two ways to share files using Threema on iOS.

Select the files in Threema: In a conversation, tap the plus sign (“+”) next to the input box, and select “Share File”. Then, choose the app that hosts the file you would like to share (e.g. Contacts), select the file, and confirm by tapping “OK”.

Select the files in another app: In the app of your choice, select the file you would like to share, tap the Share Button, choose “Open in Threema” (depending on the app, you might need to tap “Open in…” first), select the contact you would like to send the file to, and confirm by tapping “Send”.

The latest version of Threema runs on iOS 15 and up. You can continue to use older Threema versions on your pre-iOS 15 device, but you won’t be able to update to newer versions.

Older Threema versions don’t support all the features newer versions provide, and it’s advisable to install the lastest Threema version whenever possible.

Here are the last supported Threema versions for each iOS version:

  • iOS 9: Threema 4.2.3
  • iOS 10: Threema 4.6.18
  • iOS 15: Threema 4.8

The effort needed to offer compatibility with older iOS versions is substantial. For this reason, we need to drop support for older iOS versions from time to time when we release larger updates.

In Threema, navigate to Settings > Chat > Font Size to adjust the font size. If “Use system font size” is selected, the system-wide setting in iOS Settings > Display & Brightness > Text Size will be used.

Adjust the notification settings of a single or group chat like this in the iOS app:

  • Open the desired chat, and tap the title bar. Then, tap the bell (or “Stop” or “@”) symbol in the bar that appears below the title bar to open the notification settings.
  • Activate “Do Not Disturb” to disable notifications (for a certain duration). In group chats, the option "Notify when mentioned" is available: If activated, you will only receive notifications for messages in which you are mentioned.
  • Deactivate “Play notification sound” to mute notifications; you will still receive notifications, but no notification sound is played.

This message is related to the Family Sharing feature of iOS; Threema does not have any influence on it. However, problems with Family Sharing can usually be solved by offloading and reinstalling the affected app.

Go to iOS Settings > General > iPhone Storage > Threema and choose “Offload App”. When this has completed, start Threema again. The system should automatically reinstall Threema without losing any data.

In and of itself, Threema does not provide an option to save chats on iCloud. If, however, you have chosen to save device backups on iCloud, all app data, including Threema chats, will be stored on iCloud.

Neither is there a way for third-party apps like Threema to control this behavior, nor can such apps detect whether iCloud device backups are enabled or not. Even though apps can exclude individual files from backups, these files are excluded from all backups, also from encrypted iTunes backups. Therefore, we recommend to either create iTunes backups instead of iCloud backups or to exclude Threema if you must create iCloud backups.

Threema Work admins can use the MDM parameter th_disable_system_backups to prevent iCloud and iTunes from including Threema Work data in backups. As mentioned above, it is, however, not possible to only allow iTunes backups.

To learn more about security aspects of iCloud backups, please refer to this Apple article.

Threema offers different backup options for different use cases. In the following document, you will find information about when to use which backup. You will also find a step-by-step guide how to carry out the backups.

Backups on iOS

Please note that the document is only available for iOS at the moment.

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