GraphCalc 84: Graphing Calc

Now with handwriting input and photo-to-equation OCR. 12 themes. Programmable. Buy once, free updates, no ads, no subscriptions, fully offline.

A full graphing calculator with the layout and feel of a classic handheld — built for iPhone and iPad. Plot up to 9 equations, run TI-style programs, solve systems, fit regressions. No ads, no subscriptions, no internet required.

NEW IN 1.3 • Math Snap — point your camera at a printed equation, get an editable expression. • Scribble — write equations by hand or with Apple Pencil; recognized in real time. • Unit-aware arithmetic — 5[m] · 9.81[m/s^2] just works, with one-tap conversion.

GRAPHING • Function, parametric, polar, and sequence modes • 9 simultaneous equations, color-coded • ZOOM (in/out, decimal, square, standard, trig, fit), TRACE with touch-jump • CALC: zeros, min/max, intersect, dy/dx, ∫f(x)dx • Spiffy Graph mode — neon glow with adjustable intensity

MATH • Trigonometry, logarithms, complex numbers (rectangular & polar) • Matrices [A]–[J] with full linear-algebra ops • Statistics: 1-Var, 2-Var, ten regression types including SinReg • Distributions: Normal, t, χ², F, Binomial, Poisson, Geometric • Probability: nPr, nCr, factorial, randInt, randNorm, randBin

APPS • TVM Solver, Loan Calculator, Tip Split • Equation Solver, Quadratic, Polynomial Roots, Systems • Numerical derivative, definite integral, Riemann Explorer • Periodic Table, Physics Constants, Coordinate / Unit Converter • Curve Fitting, Combinatorics, Dice Probability • Date Calculator, Vector Calculator, Step-by-Step Solver, Graph Inequalities

PROGRAMMING • BASIC-style language with If/Then/Else, While, For, Repeat • Draw, Line, Circle, Shade, Text, StorePic / RecallPic • Programs persist across launches

PERSONAL • 12 themes including amber phosphor, green phosphor, midnight, paper, porcelain, sunset — all WCAG-AA contrast certified • External display support on iPad • Hardware keyboard support • Imports custom .gctheme.json files

WHY GRAPHCALC 84 • Buy once. Free updates. No ads. No subscriptions. • Every calculation runs on-device. No account, no telemetry. • Built by a developer who actually uses graphing calculators.