I started to make simple Android apps about a year ago. I have 8 apps, 1 makes 50% of the income, and 4 make the other half. The other 3 do nothing. They make ~$250 a month, so nothing crazy, but it's 100% passive. Once I release the apps, I rarely touch them again.
With ads or just paid apps? Any idea how to sell apps from unsupported countries? Thanks.