Greenlight is a small green-reading app for golf — point it at a green, and it helps read the slope and break of a putt. It was built largely with Gemini, partly as a project in its own right and partly as an excuse to see what a modern AI-assisted build workflow feels like end to end.
Nothing fancy under the hood: a focused tool for a specific, narrow problem, which tends to be the most fun kind of side project to build.