• Make sure you cover the back camera with tape before starting the app. If you start the app with no black electrical tape, then adding tape is not ideal. Kill the app as usual and start it again.
  • There is a small warm up period while the app calculates the locations of ‘hot pixels’, and some averages. This takes 30s on an iPhone 5, 4 seconds on an iPhone 7.
  • The score shown on an event is relative to your phone only, and likely others of the same model. We are finding that the cameras behave very differently and the iPhone 7 in particular seems to pose a challenge.
  • Most of the events shown on your phone are not cosmic rays. There are events from local background radiation, and some noise events likely slip through.

If you’ve read through this page, and your problem/question still isn’t resolved, head on over to our Contact Us page.

Our Privacy Policy is located here.