Online Alarm Clock
Set as many alarms as you need, each with its own repeat schedule, tone and snooze length. Includes desktop notifications, an option to keep your screen awake, and everything saves automatically so a refresh never costs you a scheduled alarm.
How to Use the Alarm Clock
Features
Most free browser alarm pages support exactly one alarm, reset the moment you set a second one. This one doesn't — set as many independent alarms as needed, each carrying its own time, repeat pattern, tone and snooze length rather than one setting applied globally. A 6 AM weekday wake-up can run a gentle chime with a short snooze while a once-only afternoon reminder runs a sharper tone with none at all, both sitting side by side in the same list.
The Check Running Underneath It
Every second, the page compares the current time against every enabled alarm's scheduled hour and minute. The moment they match — and that alarm hasn't already fired today — it rings, loops the chosen tone, and shows the dismiss/snooze overlay. Because the check runs against the device's actual clock rather than a counting-down duration, there's no drift even for an alarm set days in advance. The one real constraint, true of any browser-based alarm and not just this one: the tab has to stay open for that check to keep running at all — closed means no code executing, full stop.
Why the Tones Are Synthesized, Not Audio Files
None of the five tones — Classic Beep, Gentle Chime, Digital Alarm, Bell, Rising Tone — are recordings. Each one is built in real time from raw oscillators through the browser's own Web Audio API, with the pitch, waveform shape and volume envelope of every beep calculated on the spot rather than played back from an MP3. That's why previewing a tone costs nothing to load and why looping one for an unattended alarm never introduces the small gap or click a looped audio file sometimes has at its seam — a synthesized tone loops as cleanly as the math generating it.
What Actually Gets Scheduled
A daily wake-up with a real backup plan sets 6:45 AM on weekdays with Desktop Notifications and Keep Screen Awake both on, laptop plugged in, tab left open overnight — and still keeps a phone alarm as backup, since a browser tab alone can't be fully trusted for something this important. This tool becomes the customizable, snoozable primary rather than the only line of defense.
A string of reminders through a work day sets four separate alarms instead of one — a 10 AM stand-up, a 1 PM lunch reminder, a 3 PM stretch break, a 5:30 PM wrap-up — each labeled, each on its own schedule, all visible at a glance. A Pomodoro Timer handles the actual focus/break cycle in between; this just marks the fixed points around it.
Coordinating an early call with someone overseas means checking a World Clock before setting the alarm, confirming what time it actually is for them right now rather than an assumed offset.
And a wake-up time that actually lines up with a full sleep cycle starts from a Sleep Calculator instead of working backward by guesswork — bedtimes suggested to align with complete 90-minute cycles mean the alarm set here rings at a point where waking up feels noticeably less groggy.
Who Actually Sets These
- Remote and desk workers — a reminder to join a call, take a break, or start a task, no separate device needed.
- Students — waking for an early class, or marking when a study block should end.
- Anyone at a shared or work computer — a quick reminder with nothing to install and nothing to sign into.
- People juggling several daily reminders — medication times, standing meetings, a sequence of tasks each needing its own alert.
Getting the Most Reliable Alarm
- Keep the tab open, even backgrounded or minimized — closed means the alarm can't check the time at all.
- Turn on Keep Screen Awake for anything time-critical, so the device doesn't lock itself before the alarm is due.
- Check system volume isn't muted the first time you set an important alarm — the volume slider here only controls loudness relative to device output.
- Preview the tone before relying on it — a chime that sounds pleasant while awake may not be urgent enough to actually wake you.
- Pair it with a device alarm for anything you truly can't miss — a phone alarm isn't dependent on a browser tab staying open.
Why a Browser Tab, Not an App
No app to install, no account, works identically on a personal laptop, a locked-down work machine, or a borrowed computer. Every alarm and setting saves only in local storage; nothing is sent to a server, and clearing browser data removes it completely. It also travels with whatever you're already doing rather than asking for a context switch — one less separate thing to remember to check.
If an Alarm Doesn't Behave
Didn't go off? By far the most common cause is the tab being fully closed, not just backgrounded — confirm it was actually still open somewhere. The second most common is the device itself sleeping; Keep Screen Awake helps prevent that.
Need to change an alarm's time? There's no in-place edit — delete it and add a new one instead. Takes a few seconds and keeps the interface simpler than a full edit form for something usually set once.
Dismissed a repeating alarm and unsure it'll ring tomorrow? It will — dismissing only marks today handled. The Daily schedule itself is untouched and fires again at the same time the next day automatically.
When Not to Rely on This
If waking up on time is genuinely non-negotiable — an early flight, a critical exam — don't make a browser tab the only alarm. A closed laptop lid, a browser update restarting the tab, or simply forgetting to leave it open all defeat it completely, in a way a dedicated phone or physical alarm clock isn't exposed to. This is built for reminders and everyday scheduling where a missed alarm is an inconvenience, not a real backstop for anything truly unmissable. And for a single live countdown to one specific future date — a launch, a deadline, an event — rather than a recurring time-of-day alert, a Countdown Timer is built for exactly that instead.