Speaking as a total ignorant from a coding perspective. But I guess that wouldn’t be the hard part, considering that most of Duolinguo is just boxes and text inputs. How difficult it is to create a database of competent linguists with an efficient training who can progressively enhance your understanding of languages?
I did know about LibreLingo, but it still feels like it’s taking really small steps! And the other alternatives don’t seem to offer the semi-holistic experience that Duolingo provides.
Join LibreLingo instead of creating your own scratch. Unless you’re planning to use Rust lol