Brickie: Brickset Companion is an iPhone app that allows you to keep track of your Lego collection. Developed by hmwk. Production Application, this free app is a non-profit, ad-free, and tracking-free tool for Lego enthusiasts. It requires a Brickset account, which you can easily create or use if you already have one. While the app is not affiliated with Brickset, it is grateful for the website they have created for adult fans of Lego (AFOL).

With Brickie, you can quickly scan the box of your new Lego set and add it to your collection in seconds. If you come across an awesome set that you can't afford at the moment, you can search for it and add it to your wanted list. The app also helps you keep track of your minifigures by allowing you to add the missing ones to your wanted list and adding the ones you already have to your collection.

One of the standout features of Brickie is its offline browsing capability. You can search for sets and figurines even when you don't have an internet connection, as long as you have previously searched for them. The app is also designed to be synchronized across your iPhone, iPad, and Mac, making it convenient to access your collection from different devices.

Brickie: Brickset Companion is a free and open-source app. It will remain free and open-source, and you can contribute to its development on Github or support it in other ways, such as spreading the word to your friends or proposing new features. Please note that LEGO is a trademark of The Lego Group of companies and this app is not sponsored, authorized, or endorsed by them.