SDK Reader is an Android app developed by Billy Malick that helps you check the current running SDK version on your device. It also provides a timeline of all the Android versions that have been released, along with their API levels.

The app is user-friendly and straightforward, making it easy for anyone to use.

The timeline feature is also a great addition to the application. It allows users to see the progression of Android versions and how they have evolved over time.

Overall is a useful utility tool for Android users who want to keep track of their SDK version and stay up-to-date with the latest Android releases.