Tani DevTool - Online Time Tools

Use free online tools for clocks, timers, stopwatches, alarms, and more.

Online ClockReal-time clock for 70+ world citiesStopwatchPrecise time measurement to millisecondsTimerSet a countdown for any durationPomodoro25-min focus, 5-min break productivity techniqueInterval TimerRepeating interval timer for workouts & studyMulti TimerRun multiple timers simultaneouslyOnline Alarm ClockSet alarms for any timeServer Time / TicketingAccurate server time for ticketingD-day CountdownCount days until important dates

Key Features

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Offline Support
Install as PWA for offline use
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Dark Mode
Dark theme to reduce eye strain
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Responsive Design
Optimized for mobile, tablet, and desktop
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Multi-language
Korean and English interface
✨
Completely Free
All features free without sign-up
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Fast Loading
Optimized performance for quick start

What is Clock-Tani?

Clock-Tani is a free online time tools platform that provides all the time-related tools you need in one website. From world clocks to stopwatches, timers, Pomodoro, alarms, and D-Day counters — all 9 tools are available instantly in your browser without any installation.

Built for students, professionals, fitness enthusiasts, home cooks, and anyone who needs precise time management. Each tool offers an intuitive UI and various customization options designed for real-world use.

All features are completely free without registration or app installation. Your personal data is stored only in your browser to protect your privacy. PWA support also lets you install it on mobile devices and use it like a native app.

Which Tool Should You Choose?

Find the best time tool for your situation.

Online ClockWorld time zones

Check current time across 70+ cities worldwide in real time. Supports both digital and analog display modes.

StopwatchTime measurement

Precisely measure elapsed time to milliseconds for workouts, cooking, exams, and more. Supports lap recording and data export.

TimerCountdown

Set any duration and start an automatic countdown. Preset feature lets you quickly start frequently used times.

PomodoroFocus & productivity

Boost work and study efficiency with the Pomodoro technique: 25 min focus + 5 min break. Provides session statistics.

Interval TimerWorkouts & HIIT

Set repeating work/rest intervals for HIIT, Tabata, and other interval training routines.

Multi TimerSimultaneous timers

Run up to 4 timers simultaneously. Perfect for managing cooking times for multiple dishes at once.

AlarmTime alerts

Set alarms for any time of day. Supports multiple alarms and snooze functionality.

Server TimePrecise time

View accurate time synchronized with NTP servers. Essential for ticketing, course registration, and other time-critical events.

D-Day CounterDate calculation

Calculate days remaining until important dates. Manage countdowns for exams, anniversaries, events, and more.

Time Management Guides

A collection of practical guides for productivity and effective time use.

The Complete Guide to the Pomodoro Technique

Learn the history and scientific basis of the Pomodoro Technique by Francesco Cirillo — 25-minute focus sessions with 5-minute breaks. Step-by-step guide with practical tips you can try instantly using Clock-Tani's free Pomodoro timer.

How to Use a Tabata Workout Timer

Discover the science behind Dr. Izumi Tabata's high-intensity interval training protocol — 20 seconds on, 10 seconds off, 8 rounds. Learn how to use an interval timer for Tabata, HIIT, and circuit training workouts.

How to Calculate Time Zone Differences

Everything about time zones: UTC and GMT basics, daylight saving time (DST) rules, international meeting scheduling tips, and major city time differences. Essential for global business and travel planning.

Creative Ways to Use a D-Day Countdown

Creative ways to use D-Day countdowns for exam prep, anniversaries, project deadlines, travel departures, and goal tracking. Manage up to 20 events simultaneously with Clock-Tani's free D-Day counter.

5 Time Management Techniques to Boost Productivity

Compare five proven time management methods — Pomodoro, Time Blocking, Eat the Frog, the 2-Minute Rule, and Parkinson's Law. Understand each technique's strengths and find the best fit for your workflow.

Online Clock vs Device Clock: Accuracy Compared

A technical comparison of PC and smartphone clock accuracy, NTP server synchronization, and millisecond-precise online clocks. Learn why server time matters for ticket drops, class registration, and time-critical events.

View All Guides →

Frequently Asked Questions

Is Clock-Tani free?

Yes, all features are completely free. No registration is required.

Can I use it on mobile?

Yes, the responsive design provides an optimized experience on mobile, tablet, and desktop. You can also install it as a PWA to use it like an app.

Is my data safe?

All user data (alarm settings, timer records, etc.) is stored only in your browser's localStorage. No personal information is transmitted to or collected by our servers.

Can I use it without an internet connection?

If installed as a PWA, most features work offline except for server time which requires network access.

Which browsers are supported?

Works on all modern browsers including Chrome, Safari, Firefox, and Edge. We recommend using the latest version for the best experience.

Sound is not playing. What should I do?

Check your browser's sound settings and device volume. On mobile, make sure silent mode is turned off for alarm sounds to play.

How can I suggest features or report bugs?

Please send an email to admin@teck-tani.com and we'll review your feedback.