Sounds nice. Making predictions about personal events makes more sense to me than predicting e.g. elections or sport events (beauce a) I don't know anything about it, and b) I don't care about it). But I don't like the idea of making them (all) public, like on prediction book. Though a PredictionBook integration sounds like an obvious fancy feature.

And I liked what I saw the one second I could use the app ;-)

After installing, it crashed pressing "save" on the first prediction. Now it chrashed right on startup. I get to see the app for a moment, but I can't do anything. After deleting the data (from the android setting) I can make a new prediction, but again, it crashes after pressing "save".

I installed from the apk-link you provided.

I've got a Moto G (2. Generation) with Android 5.0.2.

Hope that helps. And if anyone can tell me how to diagnose the problem in more detail, I'd be interested in that, too.