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Feature-complete graphing calculator modernizing classic hardware with touch gestures and educational utility.
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GraphCalc 84 is a powerful graphing calculator for iPhone and iPad that combines the familiar layout and functionality of a classic handheld graphing calculator with modern touch gestures and a beautiful color display. Whether you're a student tackling algebra and calculus, a teacher demonstrating concepts in class, or a professional who needs a reliable scientific calculator on the go, GraphCalc 84 delivers the full feature set you expect — no bulky hardware required. GRAPHING Plot up to 9 color-coded equations simultaneously Function, Parametric, Polar, and Sequence graphing modes Pinch-to-zoom and finger-drag panning for intuitive exploration Trace mode with coordinate readout — double-tap to activate Preset zoom levels: Standard, Decimal, Trig, Square, and Zoom Fit Customizable window settings (Xmin, Xmax, Ymin, Ymax, scale) Auto-generated value tables with adjustable start and step size SCIENTIFIC CALCULATOR Trigonometric, inverse trig, and hyperbolic functions Logarithms (natural, base-10, and arbitrary base) Powers, roots, square root, cube root, and nth root Absolute value, rounding, integer/fractional parts, GCD, LCM Permutations, combinations, and factorials Random number generation (uniform, normal, binomial) Radian, Degree, and Gradian angle modes Normal, Scientific, and Engineering display notation COMPLEX NUMBERS Full complex arithmetic in rectangular (a+bi) and polar (re^θi) forms Conjugate, magnitude, angle, real/imaginary extraction Seamless rectangular-to-polar conversion STATISTICS & REGRESSION 1-Variable and 2-Variable statistics Eight regression models: Linear, Quadratic, Cubic, Quartic, Logarithmic, Exponential, Power, and Sinusoidal Hypothesis testing: Z-Test, T-Test, χ²-Test, F-Test, ANOVA, and more Probability distributions: Normal, Student-t, Chi-Square, F, Binomial, Poisson, and Geometric (PDF, CDF, and Inverse) Distribution shading visualization CALCULUS Numerical derivatives (symmetric difference quotient) Numerical integration (Gaussian quadrature) Summation (Σ) notation Function minimum and maximum finder BUILT-IN APPS TVM Solver and Loan Calculator for finance Equation Solver, Quadratic Formula, Systems of Equations Polynomial Root Finder Unit Converter and Coordinate Converter Physics Constants reference and Periodic Table Vector Calculator, Date Calculator, and more PROGRAMMING Built-in BASIC-style programming language Create, edit, and run custom programs Program storage between sessions ADDITIONAL FEATURES Matrix operations and storage Number base conversions (Decimal, Binary, Octal, Hex) Expression history with scrollback Persistent storage for variables, equations, and programs Familiar key layout with 2nd and ALPHA modifier keys Dark theme optimized for comfortable use GraphCalc 84 is built entirely in SwiftUI for a fast, native iOS experience. No internet connection required — every calculation runs on-device.