The free online clock that does everything time-related

ZaynClock is a single beautifully-built website for everything you ever needed to do with time. The home page shows a giant digital clock that follows your timezone and your 12h / 24h preference. Two clicks change the accent color. One click goes fullscreen. Everything you tweak is saved in your browser, so the next time you open the page it looks exactly the way you left it.

Beyond the clock you get a full suite of free tools: a countdown timer, a browser alarm, a Pomodoro timer, a quiet study clock with 25 / 50 / 90 minute presets, a high-precision stopwatch with laps, a mobile-friendly chess clock with three layout modes, a world clock for any city, a time-zone converter, a time-from-now calculator, a monthly calendar and a clean todo list that links to it.