Calc89

Calc89 is a full computer-algebra graphing calculator built around the classic 89-style keyboard. Every key, shift label and menu sits where you expect it, so the keystrokes you already know just work, now on a crisp, modern display for iPhone and iPad that follows Light and Dark Mode. EXACT ANSWERS • Fractions, radicals and π stay exact: √12 = 2√3, sin(π/12) = (√6−√2)/4 • Complex numbers in rectangular or polar form • Huge integers, exact factorials and prime factoring • Units and conversions for every common quantity, with physical constants • Decimal, hexadecimal and binary, with bitwise operations ALGEBRA • solve, factor, expand, zeros, cSolve, nSolve, propFrac, comDenom • Equations with radicals, logarithms, absolute values and trig, with general solutions • Inequalities, and systems of equations and inequalities • Rewrite expressions in terms of ln, exponentials, sin or cos CALCULUS • Derivatives of any order, including implicit • A powerful integrator: rational functions of any degree it can solve exactly, trig, exponential and logarithmic integrands, letter constants, and definite integrals that always return a value • Limits (one- and two-sided), sums and products, Taylor polynomials • fMin, fMax, arc length and differential equations with initial conditions GRAPHING • Function, parametric, polar, sequence, 3D and differential-equation modes • Trace, every zoom, and Math tools: zeros, extrema, intersections, derivatives, integrals with shading, tangents, arc length and distance • 3D surfaces you can rotate, with contours and wire frames • Slope and direction fields, and cobweb plots for sequences • Draw lines, circles, text and freehand, shade between curves, and save pictures and graph setups • Drag to pan and pinch to zoom • Tables with automatic or typed values • Split screen: two apps at once, or two independent graphs MATRICES, DATA AND STATISTICS • Exact determinants, inverses, rref, eigenvalues, LU and QR, and vector tools • Data/Matrix editor with column formulas • One- and two-variable statistics and ten regressions • Scatter, line, histogram and box plots, with frequency and category lists PROGRAMMING • Write and run programs and functions in the classic calculator BASIC • Program editor with control, input/output and variable menus • Dialogs, pop-up menus, custom toolbars and graphics commands • A text editor for notes and scripts, and a numeric solver for any equation • Folders, locking and archiving to keep your work organised Your history, variables, programs and settings are saved automatically. No accounts, no ads, no tracking, and no internet needed. Everything stays on your device.