What app has Wicked: For Good?

If you mean the song “For Good” from Wicked, it’s available on major music apps like Spotify, Apple Music, and Amazon Music on the soundtrack and cast recordings.

If you mean Wicked: For Good the film, availability depends on your country and release window. A Universal title is often available through Peacock in the U.S. after its initial release window, but exact streaming access can change, so the safest way to check is an official source or a service like JustWatch for your region.