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100% free · no signupRuns in your browser

Alarm Clock

In-browser alarm clock with live time display.

Best for: Meeting reminders while deep in work, pomodoro-style blocks, cooking at your desk, or timeboxing tasks.

Complete guide

Input

07:08:17
How it's calculated & sources
The Alarm Clock uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Set a target HH:MM. The alarm rings when the current time matches. Keep this tab open.

Example

Wake at 06:30, take medication reminders, or signal end of breaks.

Frequently asked questions

Will it work if I close the tab?+

No — browser tabs must stay open for client-side alarms.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Alarm Clock?
An in-browser alarm clock: set a time, keep the tab open, and it rings with an on-screen alert and sound at that moment.
Why does Alarm Clock matter?
A reliable nudge while you work at the computer. It complements, not replaces, a phone alarm: browsers can't wake a sleeping laptop.
How is Alarm Clock calculated?
The page watches your device clock and triggers the alarm when it reaches your set time — sound plays through the tab, so the tab must stay open and unmuted.
What are common alarm clock mistakes?
Closing the tab or letting the machine sleep — the alarm can't fire.
When should you use the Alarm Clock?
Meeting reminders while deep in work, pomodoro-style blocks, cooking at your desk, or timeboxing tasks.

What is the Alarm Clock?

An in-browser alarm clock: set a time, keep the tab open, and it rings with an on-screen alert and sound at that moment.

How the Alarm Clock works

The page watches your device clock and triggers the alarm when it reaches your set time — sound plays through the tab, so the tab must stay open and unmuted.

  1. Set the alarm time (and label it if you're setting several).
  2. Leave the tab open — pin it so it isn't closed by accident.
  3. When it rings, dismiss or snooze from the page.

Common mistakes to avoid

  • Closing the tab or letting the machine sleep — the alarm can't fire.
  • Leaving the tab muted (browsers show a mute icon on the tab).
  • Relying on it for wake-up alarms; use a device alarm for anything critical.

Keywords: alarm, clock.

Runs entirely in your browser while the tab is open.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Alarm Clock free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Alarm Clock?+

Alarm Clock uses the standard alarm clock formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Alarm Clock runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Alarm Clock on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Smart Autopilot

AI-style routing · 100% on-device

Based on this tool, your recent activity and how others chain tools together.

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Share & publish

Share & challenge

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free alarm clock — instant, no signup

Body: In-browser alarm clock with live time display. Try it: https://freetoolsgalaxy.com/tools/alarm-clock
LinkedIn post
Alarm Clock on Free Tools Galaxy — In-browser alarm clock with live time display. https://freetoolsgalaxy.com/tools/alarm-clock
Medium intro
# Alarm Clock — the free tool I keep coming back to

In-browser alarm clock with live time display.

Try it: https://freetoolsgalaxy.com/tools/alarm-clock
Quora answer
The fastest way is to use a free in-browser alarm clock: https://freetoolsgalaxy.com/tools/alarm-clock. In-browser alarm clock with live time display.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/alarm-clock?embed=1" title="Alarm Clock" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/alarm-clock" target="_blank" rel="noopener">Powered by Alarm Clock on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/alarm-clock?embed=1" title="Alarm Clock" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[Alarm Clock — free online tool](https://freetoolsgalaxy.com/tools/alarm-clock)

<iframe src="https://freetoolsgalaxy.com/tools/alarm-clock?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/alarm-clock" target="_blank" rel="noopener">Try the free Alarm Clock</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free fraction calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick fraction calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard fraction use cases (fraction, math) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/fraction-calculator

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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