[DUPLICATE] Think which which programming languages sololearn has used to creat this app

Answer 1

https://www.sololearn.com/Discuss/165754/?ref=app
https://www.sololearn.com/Discuss/348760/?ref=app
https://www.sololearn.com/Discuss/193895/?ref=app

Answer 2

For android: Java
For Apple: Swift?

Just guessing, I have no idea.

Answer 3

i am not taking about programming language
i am saying that how much long coding should be used...