MyCAS

macOS, iOS and Android. Full support.

Fully offline. No language model. Traditional mathematics. The same app on all three: type the question the way you would say it, and MyCAS returns the exact answer when there is one, the steps, the graph, and a short note when something is off.

Version 1.0.10

iOS and Android

Full support, not a cut-down page. A row of maths keys sits above the keyboard. Paper by day, ink by night.

MyCAS on a phone: the integral from -1 to 1 of e to the power x plus sin of e to the e to the e to the x plus one third, about 2.99633981197654 to 15 digits, with notes on why there is no closed form and how the value was computed. — An integral with no closed form: the value to 15 digits, and a note on how it was found.

MyCAS on a phone solving x squared plus 1 equals 0 in the complex numbers, with maths keys above the letter keyboard. — solve . The maths keys are part of the keyboard.

MyCAS on a phone in the dark theme, explaining why sines and cosines appear and plotting several solution curves. — Why the sines and cosines appear, and the curves of the family.

MyCAS on a phone showing the solutions x equals i and x equals minus i, and both roots on the complex plane. — , drawn on the complex plane.

It understands the sentence, including the typo.

Operation words work in English, Spanish, French and German. derivarive still means derivative.

Solving gives , with a note that there is no real root.

Press ⌘K, or the command key on a phone, and 226 examples are there to try. A typo is matched to the operation. A language model is not involved.

The MyCAS command menu open on Calculus, listing differential equations, recurrences, Laplace and Fourier transforms.

An exact definite integral in MyCAS, with the closed form and fifteen digits beside it. — When a closed form exists, you see it, and the decimals beside it. This one is exact.

A polar plot of r equals sine of 4 theta, an eight-petalled rose. — Plots are part of the answer. Polar, implicit, parametric, slope fields and 3-D.

It shows the working, and it says when a number is only an estimate.

A differential equation comes back with the general solution, why the sines and cosines appear, and a few curves from the family. A probability question shades the band you asked for.

If the best answer is numerical, MyCAS writes the uncertainty instead of a long string of noise. You can ask for more decimals, or give a slow integral more time, up to a few minutes. A hung calculation cannot freeze the window: it runs on a clock.

The general solution of a differential equation, with several solution curves plotted.

Paper by day, ink by night. Same mathematics.

The app has its own light and dark page, separate from this website. Exact values stay next to the decimals: eigenvalues, a characteristic polynomial, the eigenvectors, the diagonalisation.

Roots that are not real are drawn on the complex plane. A polynomial’s real roots and its conjugate pairs, with the unit circle for scale.

MyCAS in its dark theme, showing eigenvalues of a 2 by 2 matrix, exact and decimal, with eigenvectors.

What you can ask

Functions

Domain, range, roots, extrema, asymptotes, inflection, inverse and tangents, from one expression.

Calculus

Derivatives, integrals including improper ones, limits, series, Riemann sums, arc length and area.

Equations

Any degree, systems, inequalities, recurrences and differential equations. A trig equation returns the general solution, not two lucky roots.

Algebra and matrices

Factor, expand, simplify, partial fractions. Determinants, inverses, eigenvalues, row reduction, LU and QR.

Transforms

Laplace, Fourier series and transform, z-transform, Hilbert, convolution.

Chance and number

Eleven distributions, quantiles, regression, histograms. Primes, gcd, bases, continued fractions, gamma and zeta.

Discrete, geometry, complex

Counting, sets, and logic from truth tables to CNF. Polygons and triangles, in degrees or radians. Argand diagrams and every root.

Fully offline. No language model.

The algebra is SymPy, a traditional computer-algebra engine. It runs with full support on macOS, iOS and Android. It does not call a language model, and it does not need a network to answer.

Report a problem opens your mail app with the question on screen already filled in. Nothing is sent until you send it. Read the terms and the privacy policy.

A normal distribution in MyCAS, mean 170 and sigma 10, with the probability between 160 and 185 shaded.

MyCAS 1.0.10

macOS, iOS and Android. Questions: mcebrian (at) ik.me