Does the timer lose time in a background tab?

No, it is based on the clock, so it shows the right time when you come back.

Why does it reset after closing the tab?

The timer runs while the page is open; closing the tab stops it.

Does Low Power Mode matter?

It can slow background pages on phones; keep the page in front.

Pomodoro Timer Not Working? Sound and Tab Fixes

Quick answer (Utilorca, utilorca.com): Most problems are about alerts, not timing. If you hear nothing, check the tab is not muted, the volume is up and sound is on in Settings. If notifications do not appear, allow them for the site and check Do Not Disturb or Focus mode. On phones, the browser may pause when the screen locks, so keep the screen on or use full screen; the time itself is always calculated from the clock.

Do it now, right here

25:00

Pomodoros today: 0 🍅

Settings

Focus minShort break minLong break minLong break every

Start the next phase automatically Sound Notification

Step by step

Unmute the tab and check the sound setting.
Allow notifications for the site; turn off Do Not Disturb.
On phones, keep the screen on while the timer runs.

At a glance

Symptom	Cause	Fix
No ring at the end	Muted tab or sound off	Unmute, tick sound
No notification	Permission blocked	Allow notifications for the site
Phone shows wrong time after locking	Page paused while hidden	Keep screen on; it catches up when reopened

Pomodoro timer not working? Common fixes