How do I set an alarm online?

Click the Alarm tab on OnlineClockApp.com, enter your desired hour and minute, choose AM or PM, select a sound, and click Set Alarm. You can also use the Quick Set buttons to set an alarm in 5, 10, 15, 30, or 60 minutes.

What is a Pomodoro timer?

A Pomodoro timer is a productivity technique where you work in focused 25-minute sessions followed by 5-minute breaks. After 4 sessions, you take a longer 15-minute break. OnlineClockApp.com includes a full Pomodoro timer with customisable durations and automatic session tracking.

Can I use the world clock to see time in different countries?

Yes. The World Clock tab on OnlineClockApp.com shows live times for 21 major cities around the world including New York, London, Dubai, Mumbai, Tokyo, Sydney, and more — all updating in real time.

Can I set multiple alarms at once?

Yes. OnlineClockApp.com supports multiple alarms running simultaneously. Add as many alarms as you need with different times, labels, and sounds. Each alarm rings independently. You can also use the Quick Set buttons to add alarms in 5, 10, 15, 30, or 60 minutes.

What is a 1.5 hour timer and how do I set one?

A 1.5 hour timer (90 minutes) is useful for study sessions, cooking, or any task requiring 90 minutes. On OnlineClockApp.com, click the Timer tab and either tap the '1.5 hr' preset button or enter 1 hour and 30 minutes manually. The timer displays a visual progress ring and plays a sound when done.

Does the Pomodoro timer work without internet?

Yes. After the first page load, OnlineClockApp.com works completely offline. The Pomodoro timer uses timestamp-based tracking so it stays accurate even if your screen turns off or you lose internet connection mid-session.

What time is it in Karachi, Dubai, and London right now?

The World Clock tab on OnlineClockApp.com shows live current times for 21 cities including Karachi (PKT, UTC+5), Dubai (GST, UTC+4), and London (GMT/BST). Times update every 5 seconds automatically.

Free Sleep Calculator

Based on 90-Min Sleep Cycles • Wake Up Refreshed

12:00:00AM

Monday, January 1

Detecting…

Clock theme

Background colour

Custom:

Opacity:

Add Alarm

Label (optional)

Sound

Active Alarms

No alarms set. Add one above.

Quick Set

hrs

min

sec

Sound when done

⏰

Time's Up!

Your countdown has finished.

00:00.000

⬜⬜⬜⬜

Sessions completed: 0 / 4

Settings

Focus (min)

Short Break

Long Break

Sound

How Pomodoro Works

Work with full focus for 25 minutes — no distractions.

Take a 5-minute break after each session.

After 4 sessions, take a 15-minute long break.

Repeat to build deep focus and reduce mental fatigue.

Sleep Calculator

Wake-up time

We'll calculate when to go to bed to wake up feeling refreshed.

Sleep Cycle Facts

min per cycle

5–6

ideal cycles/night

min to fall asleep

New Event Countdown

Event name

Date & Time

Event

Days

Hours

Mins

Secs

Saved Events

No events saved yet. Add one above.

Free Online Clock & Alarm — Works When Your Screen Is Off

OnlineClockApp.com is a free, fast, and accurate online clock that works on every device — desktop, tablet, and mobile. Our online alarm clock works even when your computer screen is off or in sleep mode, unlike most browser-based clocks — works when screen is off. Whether you need a countdown timer, stopwatch, Pomodoro timer, sleep calculator, or world clock — everything is right here, 100% free, with no account or sign-up required.

⏰ Online Alarm Clock That Works When Screen Is Off

Set a free online alarm clock that keeps running even when your computer screen turns off or goes to sleep. Choose from multiple sounds, add a label, and use Quick Set buttons to set alarms in 5, 10, 15, 30, or 60 minutes. Includes 5-minute snooze.

⏱ Free Countdown Timer — 1 Min to 1.5 Hour & Beyond

Set a free online countdown timer from 1 minute to several hours. Popular presets include 5, 10, 15, 25, 30, 45 minutes, 1 hour, and 1.5 hour (90 minute) timer. A visual progress ring shows time remaining and a sound alert plays when done.

⏲ Free Online Stopwatch with Lap Timer

Precise stopwatch with millisecond accuracy and unlimited lap tracking. Best and worst splits are automatically highlighted in green and red.

🅱 Pomodoro Timer Online — Free Focus Sessions

Boost your productivity with the Pomodoro technique. Work in 25-minute focused sessions with automatic 5-minute short breaks and 15-minute long breaks after every 4 sessions.

🌙 Sleep Calculator — Best Time to Wake Up

Free sleep calculator that tells you the best time to wake up or go to bed based on 90-minute sleep cycles. Enter your desired wake-up time and get optimised bedtimes so you feel fully rested, not groggy.

🌎 World Clock — Current Time in 21 Cities

Check the current time in 21 major cities worldwide including Karachi, Dubai, Mumbai, London, New York, Tokyo, and Sydney. Live world clock updates every 5 seconds with date, timezone, and local time.

Why Choose OnlineClockApp.com Over Other Online Clocks?

Unlike most online clocks, OnlineClockApp.com works when your screen is off or your computer is in sleep mode — perfect for students, remote workers, and anyone who needs a reliable background timer. It loads in under a second, requires no download, works offline after the first visit, has zero ads, and requires no account. No download. No sign-up. 100% free. If you've been looking for a free alternative to vclock.com or onlineclock.net, OnlineClockApp.com gives you more tools with a cleaner experience.

Frequently Asked Questions

Is OnlineClockApp.com free to use?

Yes, completely free. No account, no subscription, and no ads. Every tool — clock, alarm, timer, stopwatch, Pomodoro, sleep calculator, and world clock — is 100% free forever.

Does the online clock work without internet?

Yes. After the first page load, OnlineClockApp.com works fully offline. The clock, timer, alarm, and stopwatch all run locally in your browser without needing a connection.

How do I set an online alarm clock?

Click the Alarm tab, enter your desired time, choose AM or PM, pick a sound, and click Set Alarm. You can also use Quick Set buttons to set an alarm in 5, 10, 15, 30, or 60 minutes from now.

What is the Pomodoro technique?

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.

How does the sleep calculator work?

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.

Which countries does the world clock support?

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.

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