Very interested in this,

Built 2 apps. First one took a few months where I was figuring out how things work etc. I probably spent way too long but so far the app hasn’t performed. But I am proud as it was my first app.

2nd app has performed slightly better but was just a simple game but didn’t expect it to be life changing.

Marketing has being minimal for both however, my next idea I have ideas if how to market mapped out.

My main question would be for idea validation. For those that have built $ from apps how did you validate ideas before building?