How can an app that is this inaccurate (its output trails actual computational results by over a week!) be so well-reviewed? And how do you inject such an offset error into a sine wave calculation? It's not exactly a difficult formula, either, sin(2πt/c) where t is the number of days since birth and c is the length of the cycle (23 days for physical, etc.). I know it's possible to do this accurately on Android because there are some apps that perform properly, but this isn't one of them, and all of you how are giving this app a five-star rating have failed to verify the results against a calculator.

J Man Love it! Used to read Bernard Gittelson books till the charts ran out.

Need easier DOB entry Can only enter DOB by going back in time one month at a time, thus for a 50 year old guy, I have to tap 600 times!

Manny Good app, easy to read and accurate it may help to make the lines a bit darker

Love It. I love my daily fix, makes you think, and not make rash decisions.

Has all the essentials. Has just about everything you'd want in biorhythm app.