Yes. JavaScript timers continue running in the background even when a tab is not active. However, some browsers throttle background tabs slightly, which can cause minor timing drift (usually under 1 second for sessions up to an hour). For high-precision timing, keep the tab active and visible.

Yes — when the countdown reaches zero, the tool plays an alert sound and flashes the display. For the sound to work, your browser must be allowed to play audio (most modern browsers require at least one user interaction before playing sound). Make sure your device volume is on.

The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. It uses a timer to break work into 25-minute focused intervals ("Pomodoros"), each followed by a 5-minute break. After four Pomodoros, take a longer 15–30 minute break. This cycle improves focus, combats procrastination, and prevents burnout.

Yes — the tool supports multiple simultaneous countdown timers. Each timer has its own label, duration, and independent start/stop/reset controls. This is useful for cooking multiple dishes, tracking multiple workout sets, or managing parallel tasks.

The stopwatch displays up to millisecond precision (HH:MM:SS.ms). JavaScript's performance.now() API provides high-resolution timing accurate to sub-millisecond levels. For most practical timing needs (sports, cooking, presentations), this is more than sufficient. For scientific precision measurements, use dedicated hardware equipment.

Yes — the Stopwatch & Timer is fully responsive and works on all smartphones and tablets. The large buttons are touch-friendly, and the display is easy to read at arm's length during sports or cooking.