tooloora

30 Minute Timer — workout, cooking, half hour block

Half an hour, preset. The daily movement portion, a roast in the oven or a block of work with a hard stop.

Runs locally — nothing is uploaded

30:00

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 minutes45 minutes1 hourPomodoro

Half an hour is the block that fits into a normal day: press start and the preset timer runs 1,800 seconds, then signals with sound and a visible alert. Thirty minutes covers the daily movement recommendation, a roast in the oven, a language lesson or a meeting you want to end on time for once.

Where does the half hour of exercise come from?

From the WHO physical activity guidelines published in 2020: adults should get 150 to 300 minutes of moderate aerobic activity per week, or 75 to 150 minutes of vigorous activity. Divided over five days, the lower end is exactly thirty minutes a day — which is why the half hour, not the hour, became the everyday unit for walking, cycling or a home workout.

Why work half an hour with a hard stop?

Thirty minutes is long enough to actually get into a task and short enough that you can promise it to yourself before lunch. The important part is the hard stop: knowing that the block ends removes the temptation to check messages in between, because there is a defined point at which checking is allowed again.

Why not just use the oven timer?

Because it only rings in the kitchen. A browser timer rings where you are, keeps the remaining time in the tab title, and can be paused and resumed without losing the measured time — useful when you take the tray out early or the recipe turns out to need another ten minutes. And unlike a phone alarm, it does not need a permission or an app.

How to set the timer

  1. Press start — thirty minutes are already loaded.
  2. Work, cook or train; check the remaining time in the tab title whenever you want.
  3. At zero, take the tone and the visible alert, then reset if a second block follows.

Frequently asked questions

Does the timer survive a sleeping laptop?

The calculation does. When the device wakes up, the remaining time is derived from the start timestamp again, so it shows the correct value instead of the number of ticks it missed. What cannot survive is the sound: a suspended page plays nothing, so it will simply be at zero when you come back.

Can I pause in the middle of the block?

Yes. Pause stores the time measured so far, and start continues from exactly that point. Pausing costs nothing, because only the spans that actually ran are ever added up.

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.