Analysis board app -- any suggestions?

I wrote an analysis board app a while ago.  It was kind of a spur of the moment thing (first version done over night when I accidentally skipped sleeping that night : )  I wrote it while in bed because I wanted to replay a book's chess game and didn't want to setup an actual board; it's too bad for me because I didn't know how to use Fritz enough at that time to do that kind of thing (I was barely able to get a chess game going in Fritz; oh heck, I still don't really know how to do an analysis game on Fritz).

Despite the highly specialized nature of the app of re-playing book games, I've found it pretty useful (e.g. using it to figure out why my version of a chess puzzle solution isn't good : )

https://play.google.com/store/apps/details?id=com.adamtai.analysisboard&hl=en

So, I've been wanting to update the app for some time. Finally, now, I plan to spend some quality time on it.  Here's the flow/usage model I want this app to do:

1. Play an OTB chess game

2. Take a picture of the game's score sheet with this app

3. This app shows an analysis board with annotations similar to chess.com's excellent/good/inaccuracy/blunder and lines to prove it

The main idea is to have OTB games in database so I can run statistic tests on the data.

Your suggestions are welcome.

I guess you could've just downloaded Chessify from the Google Play store:

https://play.google.com/store/apps/details?id=com.fimetech.chessfimee

It is missing a needed feature to scan an OTB score sheet and turn it into PGN for analysis.  Its other features that I need, my old app already have.  Also, it contains ads, which I dislike for phones because it kills battery.

Is there any available character recognition technology which could accurately decipher a sloppily written score sheet?

OCR worked very well for mine and son's score sheets.  I've not tried on sloppy handwriting; but there are only a few characters -- so maybe it isn't too bad (although my app wouldn't be targeting that)..