GolfTrainer is a golf putter practice app.
By entering success/failure for each ball, you can understand the success rate of your putts.
You can see the success rate and overall results for each club.
You can register up to 6 types of putters.
You can input up to 100 balls in one practice.
You can practice by simply aiming for the cup, or you can increase the difficulty level by using it in conjunction with a putting rail.
You can register carryover data at the beginning of the period in preparation for model changes, etc. It's manual.
You can register your club name.
You can register images of yourself practicing. (jpg.png format of about 480×320)
It can be used not only for putting, but also for practicing approaches, and can also be used as a counter for things other than golf.

Even if you practice with this, there is no guarantee that you will improve. However, I think practice never lies.