How to use the online alarm clock
You are getting ready early for a lunchtime concert at the cathedral, checking what you need before it is time to leave. An alarm at 2:51 pm gives you nine minutes before 3:00 pm, enough to put away your lunch, gather a programme or ticket, and make a calm final check rather than watching the clock.
The cathedral concert determines how reliable this reminder needs to be. After setting the alarm, check that its sound is clearly audible at your chosen volume, then keep the browser page active while you wait. If the page is closed or your phone or laptop falls asleep before 2:51 pm, the alarm cannot sound and the concert may begin without you. A device that dims its screen is not necessarily asleep, so reviewing its power settings beforehand can prevent an unexpected silent reminder.
Your walk to the cathedral may feel warmer than the air-conditioned room you are leaving, especially around midday on a bright British summer day. Keep a light layer handy for the cooler interior, but avoid waiting in direct sun before setting off. Placing your phone somewhere audible, rather than inside a packed bag, also means the 2:51 pm signal will not be muffled by belongings or the hum of air conditioning.
Common questions
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
What happens if my laptop goes to sleep before 2:51 pm?
The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
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