How to use the online alarm clock
As the Royal Society lecture finishes, gather your notes and prepare to leave without letting the evening run away from you. An alarm set for 10:28 pm gives you a clear cue to wrap up, check the route home and head out before 11:00 pm. The 32 minutes before the hour leave room for the journey to a nearby station or bus stop.
A lecture hall can remain noisy as chairs move, conversations begin and people file towards the doors, so choose a signal loud enough to stand apart from that background sound. Set the phone where the speaker is not covered by a coat or buried deep in a bag, then check the volume beforehand. If the browser alarm is closed or the phone falls asleep, it cannot sound to remind you to leave the lecture, so keep a separate fallback when timing matters.
Stepping outside after an air-conditioned lecture can make a warm London evening feel unexpectedly close, even at 10:28 pm. Keep a light layer accessible rather than packed beneath books: it can come off outdoors but helps on a cool Tube carriage or bus. A little water before leaving is also practical if the heat has lingered after sunset.
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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