Calculators that boot, update and glow.

From Calculator I to Calculator III, experience calculators that feel like real devices: animated boot screens, OLED-style displays, and smart upgrades.

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Built for the web. Inspired by premium hardware.

Calculator III

CalculatorOS Three 42 × 7 = 294

Live demo ready

Realistic boot flows

Power button, fake OS versions, updates and shutdowns make each model feel like a device.

Battery & charging

Simulated battery drain and charging animations bring Calculator III to life.

Idle OLED animations

When left alone, the display runs soft math-inspired visuals instead of going dark.