On the devices running iOS >= 17.0, keyboard apps are silently killed and changed to the default keyboard.

This "silently" indicates the following. It seems impossible to investigate the causes of the crash.

  • The number of crashes on the organizer does not contain this.
  • The crash log is not sent at all.
  • The crash log is not left on the device.
  • The number of crashes on "App Store Connect > Analytics > Metrics > Crashes" does not contain this.

Currently, we understand the tendencies of this crash are as follows.

  • Higher resolution devices.
  • Older models.

Therefore, we consider that the crashes are relevant to the memory consumption. However, we are not assured of that because of the following causes.

  • There are no crash logs.
  • The specific numbers of the memory limitation are undocumented publicly.
    • The keyboard app developers consider it an open secret, and the threshold value is based on various hypotheses.

The questions are as follows.

  • Is there a way to identify the cause?
  • Are there the same or similar reports?
  • Is there an approach to solve this crash?