Enable motion access, then shake three times within two seconds.
Motion not working?
In Brave on Android, open Settings → Site settings → Motion sensors and allow sensor access for this site. Return here and try Enable again. The app cannot override a browser block.
On iPhone, allow Motion & Orientation when prompted. If this browser does not provide motion data, try Safari. Clear always works.
How it works
Move beads toward the middle bar to count them. The upper bead is worth 5; each lower bead is worth 1. Counted beads glow green.
Slide to push neighboring beads, or tap to move a group. Several fingers can move beads together.
Drag the gold caret along the bar to choose the ones column and move the decimal place. The dots mark every third rod.
Keyboard: Tab to a bead and press Enter or Space. Use arrow keys on the decimal slider. Your board and sound preference are saved on this device.
Use Install app or Add to Home Screen to keep it close. After the first online visit, it works offline.