If youre around 17k like me, then this app can help you grow your game. I especially strengthened my opening game by playing against the computer on easy level. The downside is if you are below 18k you will lose over and over, and every time you lose a giant sign drops down saying YOU LOSE! Which is kind of demoralizing.
This app is the only one I have found that can be used as a virtual go board to play against others with built in rules. I give this app 5 stars.
Gafflemaster about CleverGo Pro, v2.91