How to use the online alarm clock
While laying out a light layer and checking the route for a circular walk on a public footpath, set the alarm for 11:39 am before it is needed. That leaves the preparation settled rather than rushed, with 12:00 pm acting as a useful reference point for when the walk should already be under way.
For this footpath outing, choose a sound that suits where the phone will be while preparations continue. A gentle tone may be enough in a quiet room, whereas a more insistent one is easier to notice from the hall or beneath outdoor clothing. Check the volume and keep the browser running until 11:39 am. If it stops running or the phone goes to sleep, the alarm cannot sound, and the walk may start later than planned.
As departure approaches, listen for the change from a quieter late morning to the busier noise around noon. Traffic, nearby work and people gathering outside can mask a soft alert, so place the phone close by rather than inside a packed rucksack. If the room is already lively, select the firmer tone and test it briefly at the same volume intended for 11:39 am.
Common questions
What happens if my laptop goes to sleep before 11:39 am?
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.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
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