Several weeks ago a new update for Chipper went out.
The update added a bidding help button to the main game as well as a standalone Bid Helper that allows you to select 6 cards and see bid estimates for that hand. Also updated the bidding algorithm to lower No Trump estimates, you should see AI bidding of No Trump go down significantly.
I sent an update to Chipper up to the Play Store today. It fixed several issues, changed some things, and added one nice new feature.
The new feature is a Quick Play button when you are passing on a hand, it speeds up the play of the AI players so you don't have to wait as long to get to the next hand. This can speed up gameplay a great deal and get you back into the game even faster then before.
Full changelog is on the game page here.