Controls: Click the + button or press ↑ to increment, click − or press ↓ to decrement. Press R to reset.
Step设置：在「Step」输入框中可自定义每次增减的数量（1-100），适合批量计数场景。
Auto-Save: Every count change is automatically recorded with timestamp. Data persists in browser storage even after closing the page.
Use Cases: Inventory counting, attendance tracking, scorekeeping, fitness rep tracking, production line counting, and more.