TimeUp

About

TimeUp is a no-fuss countdown timer that actually works when you leave the room. Unlike browser-based timers that go silent the moment you switch tabs, TimeUp runs in the background and fires a proper Windows notification when your time is up - whether your browser is minimised, you are on another tab, or you have walked away entirely.
Set hours, minutes, and seconds using the simple +1/-1 dial controls or the quick-add buttons (+10, +5, +2 for each unit). Give your timer an optional label so you remember what it was for. Choose your alarm style - a gentle chime, an insistent buzz, or silent if you only need the notification. Then close the popup and get on with your work. Click the icon at any time to check progress or cancel.

Features:

OS-level notifications that persist until dismissed - even when the browser is minimised
Gentle chime or severe alarm, with a silent option for notification-only alerts
Quick-add buttons for fast time entry (+10, +5, +2 for hours, minutes and seconds)
Optional timer label so you know what each countdown is for
Snooze option (+2, +5, +10 min) when the timer finishes
Hover the extension icon to see approximate time remaining without opening the popup
Progress bar with colour-coded countdown (turns red in the final 10 seconds)
Lightweight - only active when a timer is running.