I just published ImgToSgf on google play store. It is a small utility that creates an sgf file from an image of a go board (photo, screenshot etc). All processing is done locally on the device. Might be useful to some of you, e.g. for analyzing offline games and positions from books or videos with AI.

I made a small update, since the initial release sometimes crashed on android versions < 10. So if you installed the app on such a system and it did not work, you might have another try with the update ...