Web app · Utility
simultaneous-timer
Run any number of countdown timers at once — accurate even in a background tab.
simultaneous-timer
01
What it is
simultaneous-timer is a utility for running any number of countdown timers at once. It was built for cooking, and it stays accurate even when the tab is backgrounded.
02
How it’s built
It’s a React app that keeps time accurately in background tabs by reconciling each timer against the wall clock, rather than trusting interval callbacks that browsers throttle when a tab loses focus.