# Calc89 CAS Graphing Calculator — Intended for use with TI-89

> Intended for use with TI-89 (iPhone/iPad app by Fredinax Graphing Calculator.)

- Source: https://appshunter.io/ios/app/calc89-cas-graphing-calculator/id6818234709 (this page in markdown: same URL + `.md`)
- Developer: [Fredinax Graphing Calculator](https://appshunter.io/developer/1767217696)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 77 MB
- Languages: American English
- Released: 2026-10-27
- Data updated: 2026-10-28

## What is Calc89 CAS Graphing Calculator?

CALC89, THE CAS GRAPHING CALCULATOR
The CAS graphing calculator intended for use with TI-89 Titanium. Solve equations exactly, factor and expand, take derivatives and integrals, and graph everything, on a keypad with 2nd, ◆ and alpha layers.

EXACT ANSWERS WITH A REAL CAS
Get the exact result your teacher expects: fractions, roots and π stay exact, and one key gives the decimal when you need it.
• solve, cSolve, zeros and nSolve for equations, inequalities and systems
• factor, expand, partial fractions, common denominators
• Derivatives with d, integrals with ∫, limits, sums Σ and products Π
• Taylor polynomials and differential equations with deSolve
• The with operator: evaluate at a point or restrict a solution in one line
• Define your own functions and store values in variables
• Matrices and lists with letters: det, inverse, rref, eigenvalues
• Units: convert meters to feet or newtons to pounds right on the home line

SCAN A PROBLEM
Why type when you can scan? Point your camera at a worksheet, a textbook page or a handwritten equation. The scanner reads the math and puts it on the calculator, ready for ENTER.
• Equations, derivatives, integrals and limits land on the home line in CAS syntax
• Data tables go straight into the list editor
• Functions go into Y= and the window adjusts to them
Review the setup, tap Insert, and you are ready to solve.

GRAPH AND ANALYZE
Graph functions, parametric, polar and sequence equations.
• Use your stored variables and CAS results directly in Y=
• Find zeros, minima, maxima and intersections on the graph, then see the exact value next to the decimal
• Draw tangent lines with their equation
• Trace, zoom and explore the table of values

EVERY GRAPHING CALCULATOR TOOL
All the statistics and finance tools of a graphing calculator are built in.
• Every regression from linear to logistic, with stat plots
• Normal, binomial, Poisson, t and chi-square distributions
• Hypothesis tests and confidence intervals as clean forms
• Finance solver for TVM, polynomial root finder and system solver
• Programs in classic calculator BASIC

YOUR PERSONAL TUTOR
Stuck on the keys? Ask by text or voice. Get numbered steps with the real keys as tappable chips that open the exact menu you need. It shows you how to get the answer, so you learn the calculator for homework, tests and exams.

TEXTBOOK-PERFECT DISPLAY
Math looks like real math: stacked fractions, real roots, clean exponents. Pick one of eight themes, browse a searchable catalog with an example for every CAS command, and share your screen as an image.

WHO IS IT FOR?
High school and college students in algebra, precalculus, calculus and statistics. Teachers who want to project a CAS calculator in class. Anyone who wants exact math in their pocket.

Terms of Service:
https://fredinax.com/terms/

TI-89 Titanium is a registered trademark of Texas Instruments Incorporated. Calc89 is not affiliated with Texas Instruments.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Calculate89 AI Plus | $19.99 | per year |
| Calculate89 AI Pro | $44.99 | per year |
| Calculate89 AI Plus | $2.99 | per month |
| Calculate89 AI Pro | $5.99 | per month |
| Calculate89 AI Plus | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Calculator Lifetime | $8.99 | one-time |


## Is Calc89 CAS Graphing Calculator safe?

Not enough ratings yet to assess Calc89 CAS Graphing Calculator.

## Is Calc89 CAS Graphing Calculator legit?

Calc89 CAS Graphing Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Calc89 CAS Graphing Calculator is 63 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0.0 — 2026-10-28

No release notes.

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All apps by Fredinax Graphing Calculator: https://appshunter.io/developer/1767217696

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-28.*