My app, "Pocket Heart Sound", was finally released. It took three days, with tons of struggles, for my app to be approved for the App Store after I completed the app. Apps for Android was way much easier to release than apps for iOS.
To be honest, it is likely that I was happier when I received the acceptance letter from Apple than when my medical articles were accepted for publication in major journals.
You may say that the thing is whether the app would get popular, but I would say , "I don't care."
It does matter that I have an ability to create apps on my own.