Since I’m not good at writing paragraphs, I’ll do a list of what’s wrong.
1. Stolen from carykh, at least credit him.
2. Most automatic scrambles are impossible.
3. The colors, white numbers on bright backgrounds does not look good.
Here’s a “list” of the good things about this app.
1. The controls are very nice and intuitive.
Overall, I would not recommend this app, use a website instead.