Do they start from scratch when develop on another platform for the same app?

Question

If an app developer decided to build an app for Android and an iOS, do they build it from scratch even if they have a completed version on another platform? Since one is using Java and another is using Swift?

Answer 1

If you want to support ios and android, you will have to use frameworks like flutter or react native.

Answer 2

Ionic and react native are very popular and often used. Flutter has not been around very long and does not have such a large community yet.

Answer 3

Paul thanks for answering, are flutter and react native the common way to go for?