Friends got interested, so I started sharing my app. I found that their feedback actually made it a better product for myself as well, so I started inviting more people and gathering more feedback. It was still a side project, so I couldn't spend as much time on it as I wanted. In a couple of years it slowly became better, looked more professional and I finally switched from local files to a server and made a website so people could get the latest version more easily and give feedback.