Everything OnlineClockApp.com offers, and answers to common questions.
OnlineClockApp.com is a fast, accurate online clock that works on every device — desktop, tablet, and mobile, with no account or sign-up required. Our online alarm clock works even when your computer screen is off or in sleep mode, unlike most browser-based clocks. Whether you need a countdown timer, stopwatch, Pomodoro timer, an interval timer for workouts, a multi-step timer for recipes and routines, a sleep calculator, a sleep timer, or a world clock — everything is right here.
Here's the problem with most browser-based alarms: close the tab, lock your screen, or let your laptop sleep, and the alarm silently dies with it. Ours doesn't. It uses timestamp-based tracking in the background, so it still rings at the exact time you set — screen off, tab backgrounded, doesn't matter.
Use it for:
Pick from eight built-in sounds, add a label so you know which alarm is which, or upload your own MP3. Every alarm is saved locally in your browser, so it's still sitting there the next time you open the page — no account needed.
Try the Alarm Clock →A countdown timer only works if you can tell how much time is left without staring at numbers. That's why ours wraps every countdown in a progress ring — a quick glance tells you exactly where you stand, no math required.
Use it for:
Jump straight to a preset — 5, 10, 15, 25, 30, 45 minutes, 1 hour, or the famously useful 1.5-hour (90-minute) timer — or dial in any custom duration you need.
Try the Countdown Timer →If you're timing something competitive — a run, a rep, a race against yourself — a stopwatch that rounds to the nearest second isn't good enough. This one tracks to the millisecond and logs as many laps as you throw at it.
Use it for:
No setup, no limits on lap count — just hit start.
Try the Stopwatch →The Pomodoro technique works because it removes decision fatigue: you don't decide when to take a break, the timer does. Work for 25 minutes, break for 5, and after four rounds, take a longer 15-minute reset — all handled automatically.
Use it for:
Session durations are fully customizable if the classic 25/5 split isn't your rhythm, and it tracks how many sessions you've completed so you can see the work add up.
Try the Pomodoro Timer →Ever wake up after 8 full hours and still feel wrecked? It's not the number of hours that matters most — it's when in your sleep cycle you wake up. Each cycle runs about 90 minutes, and waking up mid-cycle is what makes you feel groggy, not the alarm itself.
Use it for:
Just enter your desired wake-up time or bedtime, and it calculates the optimal alternatives — all built on 90-minute sleep cycle science, not guesswork.
Try the Sleep Calculator →Not to be confused with the Sleep Calculator above — this is a different tool for a different moment. The Sleep Calculator tells you when to go to bed; the Sleep Timer is what you start once you're already there, winding down with music, an audiobook, or a podcast.
Use it for:
Pick 15, 30, 45, 60, or 90 minutes and the screen gradually dims to near-black as it counts down. Browsers can't stop audio playing in another app or tab, so this won't silence Spotify or YouTube elsewhere — it's a simple, honest bedtime countdown for this screen.
Try the Sleep Timer →Scheduling across time zones shouldn't require mental math or a separate tab for every city. The world clock shows live local time for 21 major cities at once — Karachi, Dubai, Mumbai, London, New York, Tokyo, Sydney, and more.
Use it for:
Add your own cities, and click any one for a distraction-free fullscreen clock.
Try the World Clock →Interval training only works if the timing is consistent — and constantly checking a phone mid-set kills your rhythm. Set a work duration, a rest duration, and a round count, and the timer cycles through automatically with a sound at every phase change.
Use it for:
You never have to glance at a screen mid-workout — just listen for the sound and keep moving.
Try the Interval Timer →Some tasks aren't one countdown — they're several, back to back. The multi-step timer lets you build a named sequence, each step with its own duration, and it runs through them in order automatically.
Use it for:
A sound plays between every step, so you always know when to move on to the next one.
Try the Multi-Step Timer →Most online clocks stop working the moment your screen turns off. OnlineClockApp.com doesn't — which is exactly why it's built for students, remote workers, and anyone who needs a background timer they can actually trust. On top of that:
If you've been using vclock.com or onlineclock.net and looking for something faster and cleaner, this is built to be that alternative — and it's free.
Yes, completely free. No account, no subscription, and no ads. Every tool — clock, alarm, timer, stopwatch, Pomodoro, sleep calculator, sleep timer, and world clock — is 100% free forever.
Yes. After the first page load, the core tools work locally in your browser without an internet connection. Internet is still needed for optional services such as Google Fonts, remote background images, and browser notifications.
Open the Alarm tab, choose a time, add an optional label, select a sound, and click Add Alarm. You can also use Quick Set to create an alarm a few minutes or hours from now.
The Pomodoro technique is a productivity method where you work in 25-minute focused sessions, then take a 5-minute break. After 4 sessions you take a 15-minute long break. Our Pomodoro timer handles all of this automatically.
Sleep cycles last about 90 minutes. Enter your desired wake-up time or bedtime, and the calculator will suggest the best times to sleep or wake so you complete full cycles and feel refreshed — not groggy.
The Sleep Calculator tells you when to go to bed or wake up, based on 90-minute sleep cycles — you use it before you sleep, to plan. The Sleep Timer is a countdown you start once you're already winding down, so it counts down and dims the screen while you fall asleep to music, a podcast, or an audiobook. They're separate tabs for separate moments.
No — browsers don't allow a webpage to control audio playing in a different app or tab, so the Sleep Timer can't silence Spotify, YouTube, or a podcast app for you. What it does do is count down and gently dim this screen to near-black, so you're not falling asleep next to a bright display. You'll still need to stop other audio yourself, or use that app's own built-in sleep timer if it has one.
The world clock shows live times for 21 major cities: New York, Los Angeles, Chicago, São Paulo, London, Paris, Berlin, Moscow, Istanbul, Cairo, Dubai, Karachi, Mumbai, Dhaka, Bangkok, Singapore, Hong Kong, Beijing, Tokyo, Seoul, and Sydney.
First use Test Sound to make sure your device volume is on and the browser is allowed to play audio. Sound can also be affected by Do Not Disturb, Bluetooth output, a muted tab, or device battery-saving settings. Keep the browser running for time-sensitive alarms.
The app keeps checking time while the tab is in the background and catches up when you return. However, browsers and operating systems can pause background pages, especially on mobile or when a device sleeps. For an important reminder, keep the browser open, allow notifications, and do not force-close the app.
When you add your first alarm, the browser may ask for notification permission. If you allow it, OnlineClockApp.com can show a notification when an alarm, timer, or focus session completes. You can change this permission later in your browser or device settings.
Your alarms, timer history, events, preferences, custom cities, and focus statistics are stored locally in your browser. No account is required. Open Privacy Policy from the footer to export or clear your saved local data.
Yes. Open World Clock and select Add a city. Choose a time zone and give it a title. Your custom cities stay in this browser until you remove them or clear local data.
Yes. Open Privacy Policy from the footer and use Export data to download your local settings, or Clear saved data to remove stored alarms, timers, events, themes, cities, and focus statistics from this browser.