Katzio: Scientific Calculator

Toolbox Calcs

About this app

Katzio turns your phone into a beautiful scientific and graphing calculator — one that finally shows math the way your textbook does. No more squinting at a cramped single line of symbols: in Katzio, every fraction, root, power, integral and matrix appears exactly as it is written on paper.

Type it naturally. Read it clearly. Get the exact answer.

Whether you are revising for an exam, solving homework, or crunching numbers on the job, Katzio combines a high-end scientific calculator, a graphing calculator, and an equation solver in one clean, fast, every feature works offline, right on your device.

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★ NATURAL TEXTBOOK DISPLAY
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The heart of Katzio. Stacked fractions, √ roots, superscript powers, integrals (∫), summations (Σ), products (Π) and matrices are rendered in true textbook typesetting as you type. What you enter looks exactly like what you would write by hand — so it is easier to read, easier to check, and far less error-prone.

★ EXACT & DECIMAL ANSWERS
Katzio keeps answers exact whenever it can — real fractions like 5/6, simplified radicals, and reduced expressions. One tap flips any result between its exact form and a decimal approximation.

★ FULL SCIENTIFIC FUNCTIONS
• Trigonometry and inverse trig in DEG, RAD and GRAD
• Hyperbolic and inverse hyperbolic functions
• Natural log, log base 10, log of any base, exponentials
• Powers, roots, nth roots, absolute value
• Factorials, permutations (nPr) and combinations (nCr)
• Percentages, scientific notation, and dozens more

★ CALCULUS ON THE DISPLAY
Compute definite integrals, derivatives at a point, summations (Σ), products (Π) and limits — entered and shown in proper notation, evaluated instantly.

★ COMPLEX NUMBERS
Complete complex-number support: arithmetic, powers and roots, modulus, argument, conjugate, and instant rectangular ↔ polar conversion.

★ EQUATION SOLVER
Solve linear and quadratic equations — including complex roots — and see clear, step-by-step working so you understand how the answer was reached.

★ 2D GRAPHING
Plot y = f(x) and watch Katzio automatically mark roots, extrema (max/min) and intercepts. Pan and zoom smoothly, and open a table of values to read exact coordinates.

★ 3D SURFACE GRAPHING
Visualise z = f(x, y) as a colorful, rotatable 3D surface — spin, zoom and explore functions from every angle.

★ A COMPLETE MATH TOOLKIT
• Matrices: add, multiply, determinant, inverse, transpose
• Statistics & regression: mean, standard deviation, quartiles, linear and quadratic fits
• Programmer / Base-N: HEX, DEC, OCT, BIN with bitwise operations (AND, OR, XOR, NOT, shifts)
• Unit converter across common measures
• Scientific constants library
• Memory registers (STO / RCL), Ans, and full calculation history

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MADE FOR
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▸ High-school students learning algebra, trigonometry and pre-calculus
▸ University students in engineering, physics, mathematics and science
▸ Teachers who want clear, textbook-style working on screen
▸ Engineers and professionals who need quick, reliable calculations

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WHY KATZIO
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✔ Beautiful natural display — math that looks like your textbook
✔ Fast and accurate, from basic arithmetic to advanced analysis
✔ Works 100% OFFLINE — no internet connection required
✔ NO ADS and no distractions
✔ Clean, modern and easy to use

Stop fighting with cramped, hard-to-read calculators. Download Katzio and do math the way it is meant to look.