Chess Clock is a free chess timer app for Android developed by John Wilde. It is designed for players who want to keep the game moving with a clean and minimalist design. This app offers a variety of features suitable for both casual and advanced players.

The app offers options for take-back, move counter, and swapping button positions. It can be used in both landscape and portrait orientations and has a bell to indicate when time runs out. The app also includes Bronstein and Fischer delay intervals for experienced players, as well as the option to use official FIDE tournament time controls or customize settings. Another unique feature is the hourglass time option, where your time goes up while your opponent's goes down. Additionally, the app allows players to see the time difference between clocks while the other clock is running. Overall, Chess Clock is a great choice for chess players looking for a customizable and easy-to-use timer app.