Silent Countdown Timer
This timer is useful for situations where you want a countdown timer but no audible alarm. I wrote it for timing speeches. It can count down from a specified duration (e.g., 30 minutes), or count down to a specified time in 24-hour format (e.g., 20:00).
This timer uses a visible alarm system. First, as time runs down, the background color changes from black to yellow to red to help remind the user of the remaining time. When time expires, the background flashes yellow and red. Importantly, the timer keeps going to negative numbers, so if you go overtime, you’ll know by how much.
To use the timer, press the edit button (edit) to set the time, then press start (play_arrow). You will probably want to click the fullscreen button (fullscreen) to get a more usable display. It’ll work on any screen, mobile or non-mobile. However, it’s up to you to prevent the screen from turning off while the timer is running.
Keyboard shortcuts: Space starts and stops the timer. navigate_before and navigate_next switch between timers when you’re using timer groups, and E edits the timer and saves your edits.