Nine tools to measure, set, and count time

No install, no sign-up — everything runs in your browser. Settings and records stay on this device and are never sent to a server.

Your device timezone

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Shown from your device clock.Compare with server time

What time is it

Check the current time and verify whether your own device clock is actually right.

Online Clock70 citiesReal-time clock for 70+ world citiesServer Time / TicketingmillisecondAccurate server time for ticketing

Measure time

Record time as it passes, or get an alert once a set duration runs out.

Stopwatchlap exportPrecise time measurement to millisecondsTimerpresetsSet a countdown for any durationPomodoro25/525-min focus, 5-min break productivity techniqueInterval TimerTabataRepeating interval timer for workouts & studyMulti Timer10 at onceRun multiple timers simultaneously

Mark the moment

Ring at a set time, or count the days left until a specific date.

Online Alarm Clockmulti-alarmSet alarms for any timeD-day Countdownlunar datesCount days until important dates

How this site is built

Instead of a feature list that could belong to any site, here is what actually holds true.

Your records stay on this device

Timer settings, stopwatch laps, alarms, and Pomodoro stats live in browser storage only. There is no account and no login, and clearing site data removes them.

Built by someone who uses it

Run by one person. Each tool exists because the operator needed it daily and kept fixing what annoyed them. The tool copy and all 20 guides are written in-house.

Tool first, explanation second

Open a page and the tool is right there, working. Instructions and background sit below it so they never block the thing you came for.

The limits are written down too

Close the browser tab and the alarm will not ring; per-site server time resolves only to the second. Those limits are stated plainly in each tool's FAQ.

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.

Time Management Guides

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

The Complete Guide to the Pomodoro TechniqueLearn 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 TimerDiscover 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 DifferencesEverything 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 CountdownCreative 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 ProductivityCompare 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 ComparedA 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?

Data created in the tools (alarm settings, timer records, etc.) is stored only in your browser's localStorage and is not sent to any server. The exception is the feedback widget: your message and optional email address are delivered through Google Forms so we can reply.

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.