Legendary Calculator

Eaze Labs

About this app

Experience 4,500 years of mathematical invention — in your pocket.

Legendary Calculator isn't just another calculator app. It's a time machine. Browse a stunning visual timeline and step inside 10 faithfully recreated calculating machines — from a 2500 BCE abacus to the modern smartphone calculator. Each one is fully interactive, historically accurate, and beautifully designed.

Every calculator actually works. Slide the beads. Turn the cranks. Push the buttons. Graph the equations. These aren't static images — they're real, functioning replicas you can compute with.

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🧮 10 INTERACTIVE CALCULATORS

① Abacus (c. 2500 BCE)
The original calculator. An interactive Chinese Suanpan with 13 rods, heaven and earth beads, and cascading bead physics. Tap to slide beads and count like the ancients.

② Pascaline (1642)
Blaise Pascal's infamous mechanical calculator. 8 spoked wheels with automatic carry propagation.

③ Stepped Reckoner (1673)
Leibniz's masterpiece. Set input dials, choose your operation, and turn the crank. Supports addition, subtraction, and multiplication through carriage shifting.

④ Difference Engine (1820s)
Charles Babbage's automatic polynomial computer. Set initial values or choose preset polynomials, then crank to generate mathematical tables.

⑤ Arithmometer (1851)
Thomas de Colmar's first commercially successful calculator. 6 brass input knobs, adjustable carriage, and a full crank mechanism for all four operations.

⑥ Curta Calculator (1948)
The legendary handheld mechanical marvel. 8 precision sliders, 6-position carriage, and add/subtract crank modes.

⑦ ANITA Mk II (1961)
The world's first all-electronic desktop calculator. Warm Nixie-tube inspired display with a full numeric keypad.

⑧ HP-35 (1972)
Hewlett-Packard's revolutionary scientific calculator that made slide rules obsolete. Full RPN (Reverse Polish Notation) with a 4-level stack, x↔y swap, roll-down, and complete scientific functions.

⑨ TI-81 Graphing Calculator (1990)
Texas Instruments' iconic graphing calculator. Fully functional with:
• Y= equation editor (4 slots: Y1–Y4)
• Live graphing with multiple curves
• Trace mode with X/Y coordinate readout
• 7 zoom presets (ZStandard, ZTrig, ZDecimal, and more)
• Window/Range editor
• Scientific functions, Degree/Radian toggle, MATH menu
• Pinch-to-zoom and pan on the graph

⑩ Smartphone Calculator (2007–present)
The modern classic. Clean, elegant, with percentage, backspace, and chained operations.

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✨ FEATURES

• No ads. No tracking. No internet required.
• Beautiful animated timeline UI — browse from modern to ancient
• Searchable by name, year, inventor, or description
• Historically accurate operation for every machine
• Built-in "How to Use" guide for each calculator
• Haptic feedback on every button press

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🎓 PERFECT FOR

• Students learning about the history of computation
• Math and engineering enthusiasts
• Museum lovers and history buffs
• Teachers looking for an engaging STEM teaching tool
• Anyone who wants a calculator that's actually interesting

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From counting beads on a wooden frame to graphing parabolas on a green LCD — this is the entire history of calculation, alive and interactive in one app.

Download Legendary Calculator and compute through history.

What’s new

Updated SDK version