Otlet is a mobile app I built to track data about the books you read. It allows the user to store a collection of books that can be added manually or via the Open Library API and then categorized over time.

You can log reading sessions, track custom metrics, and generate graphs as you gather more information.

It was born as a spreadsheet that, like many passion projects do, evolved in scope fairly quickly. Despite it being a tad overengineered, it was one of my earlier product releases and taught me a lot in the process.