I made an Android app to keep track of my domain name collections -- https://play.google.com/store/apps/details?id=id.every

From the name (Every.ID), you can say that it aims to be the one app to keep track of everything you collect: domain names, postage stamps, games, etc.

My end goal is to make it pluggable with API e.g. connect with your Steam account to auto-sync your game collection.

Unfortunately, since I'm doing it as a playground for learning new techs (I learned Flutter and Dgraph), the progress for the app itself is slow.

Fortunately, since I'm also a user (I use it often), it keeps being enhanced.