Fullscreen Timer is a free Android application developed by OHMAE Ryosuke under the category of Utilities & Tools. As the name suggests, it is a timer that displays the time in large font on the screen. The app has a simple and easy-to-use interface, making it accessible to all users.

Users can customize the color of the timer's text to their liking. The app also has the option to set a sound or vibration notification when the timer ends. This feature is especially useful when using the timer for cooking or exercise.

Overall, Fullscreen Timer is a simple and straightforward timer app that fulfills its purpose effectively. It is perfect for those who need a timer with a large font that is easy to read at a glance.