Binary display settings
Count up and read hours, minutes, and seconds in pure binary.
Binary Stopwatch (Binary Timer + Practice Mode)
Use it as a binary stopwatch or binary countdown timer. Toggle weights and practice mode, then go fullscreen for a clean, readable display.
Measure time in binary
Stopwatch mode counts upward. Timer mode counts down from its configured value and can use a completion sound. Weights labels the bit positions, Practice exposes a learning view, and Dim reduces inactive-bit contrast.
At 10 elapsed seconds, the seconds field is 1010 because the active weights are 8 and 2. Pause holds the elapsed or remaining value. Reset clears the run and restores the selected mode's starting value.
Measurement and storage
Binary changes the representation, not the timing source. Browser input and rendering latency affect what you see. The current run is held in memory and does not survive a refresh.