CASGRAPHING CALCULATOR · IPHONE · IPAD · MAC · ANDROID

A real CAS graphing calculator, on your phone.

Calc89 is a real computer algebra system intended for use with TI-89 Titanium. Exact answers, symbolic algebra, calculus, matrices and graphing, plus a camera scanner and an AI tutor that shows you the keystrokes. No ROM needed, no ads.

Free to download · No ROM needed · No ads · Works offline

Calc89 running on an iPhone: the CAS home screen shows ∫(x·sin(x),x), d(x²·sin(x),x) and limit(sin(x)/x,x,0) with exact results

CASWHAT YOU TYPE, WHAT YOU GET

Exact answers, in TI-89 Titanium command style.

Examples of CAS commands and their exact results in Calc89
Input	Result
`solve(x²−2=0,x)`	x = −√2 or x = √2
`factor(x³−1)`	(x−1)·(x²+x+1)
`d(x·sin(x),x)`	x·cos(x)+sin(x)
`∫(x·e^x,x)`	(x−1)·e^x
`limit(sin(x)/x,x,0)`	1
`deSolve(y′+2·y=6 and y(0)=1,x,y)`	y = 3 − 2e^2·x
`rref([[1,2,3][4,5,6]])`	10−1012

Commands use the same names and argument order as on the TI-89 Titanium, so what you learned in class works here.

FEATURES

A full CAS calculator app, with the commands you already know.

Real CAS, exact answers

Fractions, roots and π stay exact, and ◆ + ENTER gives the decimal when you need it, on a familiar keypad with 2nd, ◆ and alpha layers. Use solve, cSolve, zeros and nSolve for equations, inequalities and systems.

Algebra and calculus

Factor, expand, split into partial fractions and find common denominators. Take derivatives with d(), integrals with ∫(), limits, sums Σ, products Π, Taylor polynomials and differential equations with deSolve, and use the “with” operator to evaluate at a point.

Matrices, units, graphs

Work with symbolic matrices (det, inverse, rref, eigenvalues), lists and unit conversions right on the home line. Graph function, parametric, polar and sequence equations, then find zeros, extrema, intersections and tangent lines with the exact value next to the decimal.

Scan it, learn the keys

Point the camera at a printed or handwritten problem: equations land on the home line in CAS syntax, data tables in the list editor and functions in Y=. The AI keystroke tutor then shows you which keys to press.

Offline, no ROM, no ads

The CAS, graphing and all calculator tools work offline on iPhone, iPad, Mac and Android. Calc89 is not an emulator, so no ROM image is needed; there are no ads, and Family Sharing is supported on Apple platforms.

SUPPORTED COMMANDS INCLUDE

solve() cSolve() zeros() nSolve() factor() expand() propFrac() comDenom() tExpand() tCollect() d() ∫() limit() Σ() Π() taylor() deSolve() det() rref() eigVl() eigVc()

AIKEYSTROKE TUTOR

Scan a problem. See exactly which keys to press.

Point the camera at a problem from your worksheet or textbook. Calc89 reads it, solves it with the CAS and shows you the key sequence for your TI-89 Titanium, one step at a time.

01
Scan
Take a photo of a printed or handwritten problem.
02
Solve
Get the exact answer from the built-in CAS.
03
Learn the keystrokes
Follow the interactive tutor and enter it yourself on the TI-89 Titanium.

The tutor answers by text or voice. Steps come back numbered, and every key is a tappable chip that opens the matching menu in the app.

Calc89 “What can I scan?” guide: point your camera at any math task, such as a calculus worksheet with integrals, limits and equations; the numbers land in the calculator and the AI walks you through the task one step at a time — What can I scan? Worksheets, textbook pages and handwritten problems.

SCREENSHOTS

Calc89 on iPhone

Calc89: Intended for use with TI-89. CAS, exact, symbolic, AI. Home screen with ∫(x·sin(x),x), d(x²·sin(x),x) and limit(sin(x)/x,x,0) solved exactly. — Intended for use with TI-89.

Calc89: Full CAS. Exact answers. F2 Algebra: factor(x⁴−1) = (x−1)·(x+1)·(x²+1) and expand into partial fractions. — Full CAS. Exact answers.

Calc89: Every app you need, built in. Apps menu with Calculate, Graph, Table, Mode Settings, Solver, Polynomial, Systems, Finance, Matrix and Stats. — Every app you need, built in.

Calc89: Why type? Just scan. AI scan result “Here’s what I found” with an integral, a derivative and a solve command ready to insert into the calculator. — Why type? Just scan.

Calc89: An AI tutor that knows every key. Chat answering “How do I find the area between y=x² and y=x?” with numbered steps and tappable key chips. — An AI tutor that knows every key.

Calc89: Find max, min and zeros. F5 Math on the graph of y1 = x³−3·x with the maximum marked at x = −1, y = 2. — Find max, min and zeros.

Calc89: Solve differential equations. deSolve(y'+2y=6 and y(0)=1,x,y) = 3−2/e^(2·x) and deSolve(y'=x·y and y(0)=1,x,y) = e^(x²/2), with slope fields. — Solve differential equations.

Calc89: From scan to answer. AI Run and Guide me: the scanned integral ∫(x·eˣ,x) = eˣ·(x−1) is on the home screen, the next task is set up and ready to run. — From scan to answer.

ALSO BUILT IN

Every graphing calculator tool, not only the CAS.

Graph and analyze

Function, parametric, polar and sequence graphs
Zeros, minima, maxima and intersections
Tangent lines with their equation
Trace, zoom and table of values

Statistics and probability

Every regression from linear to logistic, with stat plots
Normal, binomial, Poisson, t and chi-square distributions
Hypothesis tests and confidence intervals

Finance and programs

TVM finance solver
Polynomial root finder
System solver
Programs in classic calculator BASIC

Display and learning

Textbook-style display with stacked fractions, roots and exponents
Eight themes
Searchable command catalog with an example for every CAS command
Share the screen as an image

COMPARE

Calc89 vs. a TI-89 Titanium handheld

Comparison of the Calc89 app, the TI-89 Titanium handheld and emulator apps
Feature	Calc89 app	TI-89 Titanium	Emulator apps
Exact symbolic CAS	Yes	Yes	Yes
TI-89 Titanium command names	Yes	Yes	Yes
Needs a ROM image	No	Built in	Usually
Camera problem scanner	Yes	No	No
AI keystroke tutor	Yes	No	No
Works offline	Yes	Yes	Yes
Display	High-resolution color, eight themes	160 × 100 pixel monochrome LCD	Emulated 160 × 100 screen
CAS and graphing speed	Native speed on your phone	16 MHz processor	Emulated, depends on the device
Runs on	iPhone, iPad, Mac, Android	Handheld	Varies

Calc89 is an independent app. TI-89 Titanium is a trademark of Texas Instruments, and Calc89 is not affiliated with or endorsed by Texas Instruments.

LEARN

Learn the TI-89 Titanium, command by command.

FAQ

Frequently asked questions

Is there a TI-89 Titanium app for iPhone or Android?

Yes. Calc89 is a CAS graphing calculator for iPhone, iPad, Mac and Android intended for use with TI-89 Titanium. It uses the same command style, such as solve(), d(), ∫(), limit() and deSolve().

Do I need a TI-89 ROM file?

No. Calc89 is not an emulator. Its CAS is built in, so no ROM image or calculator hardware is needed.

Does Calc89 work offline?

Yes. The CAS, graphing and all calculator functions work offline.

Can Calc89 solve equations symbolically and give exact answers?

Yes. It returns exact fractions, roots and π, and supports solve, factor, expand, derivatives, integrals, limits, deSolve and symbolic matrices (det, rref, eigenvalues).

Can it teach me which keys to press on my TI-89 Titanium?

Yes. The interactive AI keystroke tutor shows the key sequence for a problem on the TI-89 Titanium, step by step. You can also scan a problem with the camera.

Is Calc89 made by Texas Instruments?

No. Calc89 is an independent app and is not affiliated with or endorsed by Texas Instruments. TI-89 Titanium is a trademark of Texas Instruments.

Does Calc89 support Family Sharing?

Yes. On iPhone, iPad and Mac, Calc89 supports Apple Family Sharing. Buy it once and share it with your children and up to five family members.

Does Calc89 have ads?

No. Calc89 has no ads.

What does Calc89 cost?

Calc89 is free to download. Pro features are available as an in-app purchase; the current prices are shown in the app before you buy.

Does Calc89 run on Mac?

Yes. The iPad version runs on Macs with Apple silicon (macOS 14 or later) from the Mac App Store.

Which TI-89 Titanium commands does Calc89 support?

Algebra: solve, cSolve, zeros, nSolve, factor, expand, propFrac, comDenom, tExpand, tCollect. Calculus: d, ∫, limit, Σ, Π, taylor, deSolve. Matrices: det, inverse, rref, eigVl, eigVc. The in-app catalog lists every command with an example.

Can I use Calc89 on a test?

Phone and tablet apps are not permitted on standardized exams. The SAT (since August 2025) and the ACT prohibit CAS calculators, including the TI-89 Titanium. The AP Calculus and AP Physics exams still permit the physical TI-89 Titanium handheld. Calc89 is built for homework, college coursework and practicing the exact keystrokes for your handheld before test day.

Which courses is Calc89 for?

Calc89 is built for AP Calculus AB and BC, college Calculus I to III, Differential Equations, Linear Algebra, AP Physics and engineering courses, and it also covers algebra, precalculus and statistics classes. The CAS does the symbolic work, and the tutor shows the keystrokes for your TI-89 Titanium.

ABOUT

Built by Fredinax

Calc89 is made by Fredinax, an education publisher with years of experience building learning tools for math and science students. We build software that helps students understand the steps, not only the answer. Calc89 is built for AP Calculus (AB and BC), college Calculus, Differential Equations, Linear Algebra, physics and engineering courses.