Alarm Clock Tab is a free online alarm clock that lives entirely in a browser tab, with no account and nothing to install. You set the hour and minute, and the site plays an alarm sound and shows your message at the set time. It was built for the moment your phone is dead or charging in another room: any laptop or desktop with a browser becomes a working alarm clock.
The site is more than a single alarm. A timer handles countdowns, a circuit training timer runs interval workouts, and a stopwatch covers simple timing. Utility pages round it out: a time zone converter for comparing differences between cities and a holidays calendar showing today and upcoming federal, national, statutory and public holidays. A light and dark mode and preset alarms keep the common cases one click away.
Because everything runs in the tab, the one requirement is keeping that tab open and the computer awake, which the site makes easy to manage with a pinned tab. For travel, shared computers or a phone-free desk setup, it is a deliberately simple answer to an everyday problem.
