Interesting project I saw on Hacker news site
ReadToMe: Paper to Audio
Turn any book into an audiobook. Scan pages with your phone camera, then listen to high-quality, mistake-free audio.
Its not free - apparently the cost is to cover the API charges ......
https://www.readtome-app.com/
The developer is on the discussion at https://news.ycombinator.com/item?id=39255792 and talks about how it is built.
Interesting .......
Paper to Audio app
Moderator: peterZ