The method I've been going with recently is to just clone an existing app. I was inspired by max rozen blogging about building the '200th uptime checker'. https://maxrozen.com/#bootstrapping-onlineornot

I've made a pdf bankstatement to csv app and now working on a session recording app.

The bank statement tool hovered around break even, but ultimately I shut it down since I hit a point where I was just grinding out integrations with different pdf bank statements, which got old, and had no end in sight.