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So, I was thinking of a chemistry app.

With a similar interface as this:
https://phet.colorado.edu/en/simulation/balancing-chemical-equations

But, of course the student should be able to use his/her own chemistry equation to balance.

That could be an input text field, OR, take a picture of the equation, and then text
recognition.

Anyone with experience in this? :)

text recognition is a bugabear without access to libraries such as tesseract-ocr. if younare willing to let google do the work for you, iirc there is an api for google photos whch will give you ocr