# Calc89 CAS Graphing Calculator > Full text of https://calc89.com/ for AI assistants, in page order. CAS GRAPHING 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. - Download on the App Store: https://apps.apple.com/us/app/calc89-cas-graphing-calculator/id6818234709 - Get it on Google Play: https://play.google.com/store/apps/details?id=com.fredinax.calculate89ai Free to download · No ROM needed · No ads · Works offline Image: 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. ## What 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·eˣ,x)` | (x−1)·eˣ | | `limit(sin(x)/x,x,0)` | 1 | | `deSolve(y′+2·y=6 and y(0)=1,x,y)` | y = 3 − 2/e^(2·x) | | `rref([[1,2,3][4,5,6]])` | [[1,0,−1][0,1,2]] (shown as a 2 × 3 matrix) | 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() ## AI keystroke 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. 1. Scan: Take a photo of a printed or handwritten problem. 2. Solve: Get the exact answer from the built-in CAS. 3. 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. In-app guide "What can I scan?": point your camera at any math task, such as a calculus worksheet with integrals, limits and equations. The numbers land in the calculator, ready to use. Then let the AI walk you through the task, one step at a time. ## Screenshots: Calc89 on iPhone 1. 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. 2. Calc89: Full CAS. Exact answers. F2 Algebra: factor(x⁴−1) = (x−1)·(x+1)·(x²+1) and expand into partial fractions. 3. Calc89: Every app you need, built in. Apps menu with Calculate, Graph, Table, Mode Settings, Solver, Polynomial, Systems, Finance, Matrix and Stats. 4. 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. 5. 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. 6. 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. 7. 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. 8. 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. ## 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 | 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. ### Commands reference Every CAS command with its syntax, the keys to press and a worked example. Look up solve(, d(, deSolve( or rref( before you need them in class. https://calc89.com/commands/ (plain text for AI assistants: https://calc89.com/commands/llms.txt) ### Guides Step by step guides for AP Calculus, differential equations, linear algebra and the keypad layers. Each one lists the exact keystrokes and the result. - TI-89 Titanium for AP Calculus AB and BC: https://calc89.com/guides/ti-89-ap-calculus/ - Differential equations with deSolve(: https://calc89.com/guides/ti-89-differential-equations/ - Linear algebra, matrices, det, rref and eigenvalues: https://calc89.com/guides/ti-89-linear-algebra/ - The keypad explained, 2nd, ◆ and alpha layers: https://calc89.com/guides/ti-89-keystrokes-basics/ ### Calc89 vs TI-89 Titanium An honest comparison of the app, the handheld and emulator apps, including exam rules. See where each one wins. https://calc89.com/ti-89-alternative/ ## 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. Fredinax: https://fredinax.com ## Legal and links Calc89 is an independent app and is not affiliated with or endorsed by Texas Instruments. TI-89 Titanium is a trademark of Texas Instruments. - App Store: https://apps.apple.com/us/app/calc89-cas-graphing-calculator/id6818234709 - Google Play: https://play.google.com/store/apps/details?id=com.fredinax.calculate89ai - Privacy: https://fredinax.com/privacy/ - Terms: https://fredinax.com/terms/ - © 2026 Fredinax.