Once upon a time, I needed to run a bunch of timers for a D&D game I DM in which 'real-time' events were going to happen to the players. I ended up fiddling with phones and it sort of caused me a lot of stress.
Since I couldn't quickly find the kind of web app that I needed, I spent a few hours over the weekend building what I need. It's free to use, runs 100% in browser, has a lot of customization options.
I will not be taking any feature requests or bug fixes.
Either type in the M and S fields (Minutes and Seconds) or use the arrow buttons to change the value.
Click ▶ to start a countdown. Click ⏸ to pause a countdown. Click ↺ (only when paused) to reset the timer back to the previously set values.
You can change the name of the timer by clicking on the field that says Timer 1 initially. An uncreative default name will be assigned to each new timer.
A sound will play when the timer hits 0. Click ⚙ to disable the sound playing. In this menu you can also change the colors of the timer, Delete the timer, or make it auto reset at the end of the run.