Denso is a free study timer built for focus, not features. I built it because every Pomodoro app I tried had ads, required accounts, or was overloaded with stuff I didn't need. Features: → Pomodoro + free timer modes → Customizable durations per subject → Track subjects and todos → 8 minimal themes → Achievement system → Works offline (PWA) → No account needed - all data stays on your device 100% free, no ads, forever.