Utility clocks for the web
Dark-first tools inspired by classic online clocks: alarms with sound and notifications, timers, and world time — with fast, crawlable preset URLs.
06:04:13 AM
Tuesday, November 10, 2026
Local System Time
Utility Suites & Categories
Select a suite to open full-featured online calculators, timers, and timing utilities.
Alarm Clock
Reliable browser alarms with recurring options, multiple schedules, and Web Audio API synthesizer fallbacks.
Timer
Custom and preset countdowns with visual progress rings, fullscreen mode, and audible notifications.
Stopwatch
Precision millisecond stopwatch tracking with split times, fastest/slowest lap highlighting, and lap export.
World Clock
Live local times across global cities with automatic Daylight Saving Time handling and multi-city overlap planner.
Date & Calendar
Exact biological age calculator, working business days counter, date differences, and leap year checks.
Calculators
Instant percentage calculators, metric-imperial scientific unit converter, and keyboard-accessible basic calculator.
Productivity
Ultradian sleep cycle planner, Pomodoro focus sprints, customizable interval HIIT timers, and event countdowns.
Converters
Scientific unit conversions across area, volume, pressure, energy, power, fuel economy, and cooking measurements.
Finance Calculators
Financial loan EMI calculator, compound growth modeling, GST/VAT invoices, profit margins, and savings goals.
Text Tools
Client-side text tools: word & character counting, case conversions, duplicate line removal, and diff comparison.
Popular Utility Tools & Shortcuts
Engineered for Accuracy, Privacy & Offline Utility
UtilityClock is built from the ground up without third-party tracking, heavy analytics scripts, or remote calculation servers. Everything computes locally on your device.
100% Client-Side Privacy
Your alarm times, dates of birth, stopwatch laps, and calculator inputs never leave your device. No accounts, cookies, or remote logging.
Offline PWA Capable
Equipped with a modern Progressive Web App Service Worker that precaches core tools and audio chimes so you can keep working even when disconnected.
Microsecond Native Precision
Timers rely on high-resolution performance.now() and Web Audio synthesis rather than drifted interval loops.