Last year I moved to Tallinn, Estonia, which is known also by it's public transport system - free for city residents. It is so good, reliable and optimized, that I sold my car and use buses and trams exclusively for all my city travels.

While planning a transit route is pretty straightforward with an official website, usually I need some transit-related information on the go. On a phone. And that's where both the website and many big and small apps show their imperfections. Download sizes, ads, user interface. Instead of focusing on my problems, I have to learn and work around apps' issues.

As an open source developer, that seemed not an issue - but a challenge. I've made interactive maps for the past ten years, and I know one should not use these libraries with default settings. Nor one should ever rely on zooming. Could I made a map with apps that doesn't require more than a couple of taps to get all the needed information? How hard would it be to keep number of buttons and other interactive elements to minimum, while not sacrificing functions I need every day?