How to use the online alarm clock
You’re finishing your National Trail route and heading away at 4:20 pm, while there is still enough daylight to check the last waymarker, gather your kit and leave the path safely. An alarm at this time gives the walk a firm stopping point rather than letting the final stretch drift towards 5:00 pm. It also leaves a clear cue to turn back if the route has taken longer than expected.
A trail finish can come with wind, conversation and traffic near a car park, all of which may cover a quiet alarm. The selected volume needs to be clearly audible against that background noise, and a brief sound check before setting off helps reveal whether the tone is too soft. If the browser page is closed or the phone or laptop falls asleep, no signal will sound, so the route may not end when planned. Keeping the alarm active and the equipment awake avoids relying on a reminder that cannot play.
Leaving open ground in the late afternoon can feel different once the air turns damper, especially after a warm walk. At 4:20 pm, a light breathable layer kept within reach is more useful than one buried at the bottom of a rucksack. Moist air can also settle on a screen, so the alarm controls remain easier to use when the phone stays in a dry pocket until needed.
Common questions
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.
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.
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