Timer is an open-source android app that provides a stopwatch, countdown timer, and world clock viewer. It is a free app that aims to fill the gap of basic timer functionality that is missing in vanilla android. The app has a simple and intuitive interface that uses standard android UI widgets and libraries.

The stopwatch and countdown timer are easy to use and provide accurate results. The world clock viewer is a handy feature for people who work with clients or teams in different time zones. The app is lightweight and does not take up much space on your phone.

Overall, Timer is a great app for people who need a simple and reliable timer app on their phone. The app is open-source, so if you want to improve it or customize it, you can easily fork it on Github.