How to use the online alarm clock
Hand the last task to someone else before leaving for your shift at a London fire station, with the 4:50 am alarm marking the moment to move. That leaves a short, useful window before 5:00 am for pulling on your coat, checking that keys and travel card are with you, and saying a quiet goodbye without rushing through the door.
Your fire-station departure depends on hearing the alert, so the browser needs to remain active until 4:50 am. If the page is closed or the phone falls asleep first, the alarm will not sound and the shift could begin without the warning you expected. Keeping the phone connected to power can reduce the chance of battery-saving behaviour interrupting it, while a separate alarm offers sensible backup for a journey that cannot wait.
Once the handover at home is done, allow some spare time between the alarm and the next commitment later that day. At this hour, London streets and public transport may run differently from daytime patterns, so a small buffer can absorb a missed connection or a slower walk. Packing food, uniform items and anything needed after the shift beforehand also protects that margin, leaving 4:50 am for getting out rather than searching cupboards in the dark.
Common questions
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.
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.
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