How to use the online alarm clock
While handing the night engineering handover to the next colleague, a 7:09 pm alarm can mark the moment to check the Underground works timetable together. That leaves both people looking at the same planned closures, access times and late-service changes before responsibility passes across. Any points still unclear can be noted well before the next natural checkpoint at 8:00 pm.
In a control room, depot office or busy home workspace, the alert needs enough volume to stand apart from conversation, ventilation and nearby equipment. A test at the intended setting can reveal whether the chosen sound disappears into that background noise; placing the computer within easy hearing also helps. If the browser is no longer running when 7:09 pm arrives, the alarm cannot sound, so the engineering handover may miss its timetable check. A separate backup is sensible when that check affects the night’s plan.
During a warm British evening, the handover may happen in a room where air conditioning is running steadily. Its hum can mask a quiet alert, while a strong cold draught may encourage people to move away from the desk. Keeping the alarm near whoever is taking over, with the volume tested while the air conditioning is on, gives the 7:09 pm reminder a clearer chance of being heard.
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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