tooloora

1 Hour Timer — the long block, running in the tab

Sixty minutes, preset. For a roast, a deep work block or parking time, with the remaining hour always visible in the tab title.

Runs locally — nothing is uploaded

1:00:00

Remaining

Minutes and seconds may go above 59: 90 in the minute field means one and a half hours.

Quick pick

Runs locally in your browser — nothing is sent.

Other durations

1 minute3 minutes5 minutes10 minutes15 minutes20 minutes30 minutes45 minutesPomodoro

One hour is the longest span people still hold in their head: press start and the preset timer runs 3,600 seconds, then signals with sound and a visible alert. An hour covers a roast, a deep work block, parking time or a call you want to end on time. The tab title shows the remaining hour throughout.

Why does an hour have 60 minutes?

Because we inherited a base-60 number system from Babylonian astronomy, where 60 was convenient for having many divisors. The modern definition is far more precise: since 1967 the second has been defined by 9,192,631,770 oscillations of the caesium-133 atom, so an hour is exactly 3,600 of those seconds — 33,093,474,372,000 oscillations, entirely independent of the earth's rotation.

Does an hour long countdown stay accurate?

Yes, and the longer the countdown, the more the method matters. Over an hour a background tab may be throttled to roughly one call per minute, so a timer that counted its own ticks could be minutes off by the end. Here the display is a subtraction against the start timestamp, so the error stays at the size of one redraw regardless of how long the tab was hidden.

Hour countdown or alarm at a fixed time?

Use the countdown when the length matters — an hour of baking, an hour of work. Use alarm mode when the moment matters: the train at 17:40, the call at 15:00. In alarm mode you enter the clock time and the tool works out the distance itself, including the case where the time has already passed today and therefore lands tomorrow.

How to set the timer

  1. Press start — sixty minutes are already loaded.
  2. Keep the tab open; the title shows the remaining time so you can check it from the tab strip.
  3. At the end you get a tone and a visible alert; reset for the next hour.

Frequently asked questions

Can I set 90 minutes or two hours here?

Yes. Type the value into the hour and minute fields; the minute field is not capped at 59, so 90 minutes is a valid entry and simply means one and a half hours. The upper limit is 99 hours, 59 minutes and 59 seconds.

What happens if I close the tab?

The timer ends with the page, because there is no server keeping it alive. That is the price of a tool that stores nothing about you. For a countdown that has to survive a closed tab, the alarm clock in your phone is the right tool.

Does the timer keep running when I switch tabs?

Yes. The remaining time is calculated from the timestamp at which you pressed start, not by counting ticks. Browsers slow background timers down to about one call per minute, and a sleeping device stops them completely — a counting timer would fall behind by exactly that amount. This one simply subtracts again when the tab comes back and shows the correct value.

Does the timer send anything to a server?

No. No server is involved at all: the countdown is a subtraction against your device clock, done entirely in JavaScript in your browser. There is no account, no cookie for the timer, and nothing is uploaded or sent anywhere. You can load the page, switch to airplane mode and the timer still runs — which is the simplest way to verify the claim yourself.