A free app for Android, by James Ots.
If you want to know how long it takes to go from one stage to the other, how often the contractions occur, and when it is safe to go to the hospital, this is the app for you.
With this app, you can keep track of the time spent on each stage. You will also be able to compare the durations of the contractions and the interval between them.
Contraction Timer helps you keep track of your labor progression. It can also be shared via email and other apps so that you can see your labor progress on your smartphone.