A fun game if you like music.
An app that plays some characteristic part of a song or music piece (the beginning few seconds, the bass line, etc.), and you have to identify it as quickly as possible. You can invite friends to a challenge. Leaderboards show the best overall, by music genre, decade, etc.
Reading text while driving, or worse, answering to text received on your phone is very dangerous.
A function of the phone that detects when you are in a car and driving and ask if you are the driver. If you answer yes or just don’t respond to the phone will turn off notifications for received texts.
When something is happening to us, either good and exhilarating or bad and tragic, we don’t usually take notice of the exact time it happened for understandable reasons. We might want to know that in the future: when exactly did he ask my hand in marriage, when did I saw the man hit the tree etc.
Many nowadays have smartphones on them most of the time. Smartphones can record many useful things: sudden movements, sounds, vibrations, and maybe even heartbeats. These can help pinpointing the exact time something surprising happened.
When you are really concentrating on something it would be good if your surroundings (computer, smartphone) would take notice and automatically eliminate distraction until you finish.
Have the built-in camera track your eyes and measure your pupils’ dilation. When it detects a larger dilated pupil for a certain period of time – indicating higher concentration and attentiveness – it should start shutting down distractions like alerts etc.