# Calculate84 — Intended for use with TI-84

> Modern interactive graphing calculator app for iPhone. (iPhone/iPad app by Century Light LLC.)

- Source: https://appshunter.io/ios/app/calculate84/id1459712793 (this page in markdown: same URL + `.md`)
- Developer: [Century Light LLC](https://appshunter.io/developer/1459712792)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Rating: 4.80/5 from 52,320 App Store ratings · 357 written reviews indexed
- Age rating: 12+
- Requires: iOS 18.0 · 71 MB
- Languages: American English
- Released: 2019-08-17
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calculate84/id1459712793/reviews.md

## What is Calculate84?

Graphing made for iPhone

Calculate84 brings the graphing calculator experience to iPhone with a fast, touch-friendly design.

What you can do:
• Plot and explore graphs with smooth touch controls
• Find familiar calculator functions quickly
• Scroll naturally through equations and results
• Get clearer, more helpful error messages
• Send feedback directly from the app

Why we built Calculate84

We relied on graphing calculators ourselves and wanted an app that felt easier to use on a modern phone. Before launch, we worked with students to refine the experience, and we continue improving it based on user feedback.

Send feedback

Tap the red Feedback button in the app.

Terms of Use (EULA): https://calculate84.com/terms-of-use

## Key features

- Fast, interactive touch-screen graphing
- Scrollable windows
- Intelligent error messages
- Intuitive interface
- Designed for TI-84 users

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Pro Subscription | $2.99 | per month |
| Annual Pro Subscription | $6.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Subscription | $6.99 | one-time |
| Lifetime Subscription | $9.99 | one-time |
| Lifetime Subscription | $12.99 | one-time |
| Lifetime Pro Subscription | $29.99 | one-time |


## Chart rankings

- #65 in Top Free · Education (US App Store)

## What do users think of Calculate84?

Overall sentiment: positive

**Pros**

- 👍 Identical to TI-84 calculator
- 🚀 Seamless and intuitive user experience
- 💰 Affordable alternative to physical calculator
- 📱 Convenient to have on phone
- 🔍 Comprehensive functionality matching physical calculator
- 🤝 Honest and responsive developers
- 🎨 Beautiful and polished user interface

**Cons**

- 🐛 Occasional bugs and crashes
- 🔍 Missing some advanced features like regression types
- 🔒 Previous purchases removed without warning
- 💰 Subscription model can be expensive
- 📺 Intrusive ads in free version

**Commonly reported bugs**

- Crashes when using 2-sample T/Z interval functions
- Incorrect results for inverse trig functions
- Issues with graphing parabolas and tracing points
- Regression equation not displayed correctly

**Most requested features**

- Add TVM solver functionality
- Implement more regression types
- Allow disabling of ads for free users
- Restore previous purchase benefits
- Optimize for mobile experience instead of emulating physical calculator

## Recent user reviews (10 of 357)

All indexed reviews: https://appshunter.io/ios/app/calculate84/id1459712793/reviews.md

### 3/5 — Wrong answers for exponential equations

*2026-08-25, version 3.0.3*

When I entered “Ans^-10”, Ans being 1e-1000; The wrong answer this gave me “1e-10000” instead of the correct “1e10000”. I noticed this many more times before while calculating big numbers like that, before crashing.
Otherwise, this is a great calculator app, and I hope to see it get better!

### 1/5 — Y’all took away ad free for early adopters.

*2026-08-22, version 3.0.3*

Restore purchase doesn’t work either. What a shame. That deserves a 1 star.

### 5/5 — has saved my life

*2026-08-16, version 3.0.2*

got me through AP Calc and IB math. i love it!!!

### 2/5 — Lagging past week

*2026-08-15, version 3.0.2*

I love this app so much. I have a shortcut to it on my phone home screen, have told my friends to download it regardless of if they need a calculator app, etc. I have an average 30+ mins of screen time on this app alone for every calculation I need to do... until this past week. Out of seemingly nowhere, 5ish days ago, the entire app has been extremely slow. Like, type a number in and it shows up on the screen seconds later. Nothing else on my phone has been affected. Calculate84, I am one of your biggest fans, and if this issue is resolved I would love to update this review to the 5 stars you deserve.

### 5/5 — literally can calc big numbers

*2026-08-15, version 3.0.2*

great job

### 3/5 — Was convenient, now slowed

*2026-08-13, version 3.0.2*

The app was a great convenience when I downloaded it a couple years ago. But lately, the app feedback has been significantly when I’ve tried to type in numbers. It has become more of an inconvenience due to the delay, sometimes lack of response.

### 5/5 — Really Useful

*2026-08-10, version 3.0.1*

This calculator app is very useful for homework

### 5/5 — Best calculator app

*2026-08-10, version 3.0.1*

All functions of TI-84 for free. A lifesaver for broke high school and college students

### 3/5 — Close enough

*2026-08-08, version 3.0.1*

Easy to use but not like the actual calculator on some parts

### 5/5 — Exactly what you pay for

*2026-07-21, version 2.6.4*

It works exactly like how you expect it to. It’s literally a full fledged TI-84 calculator that’s on your phone. You have to pay the 30 dollars to actually use all of the features but that’s way cheaper than ones you can get at the store. This is a must have for anybody in school

## Frequently asked questions about Calculate84

### What does Calculate84 do?

Calculate84 provides a modern graphing calculator experience directly on your iPhone. It aims to replicate the functionality of physical graphing calculators with a user-friendly interface, featuring fast touch-screen graphing and scrollable windows.

### What are the key features of Calculate84?

Key features include fast and interactive touch-screen graphing, scrollable windows for easier navigation, and intelligent error messages to help users understand and correct mistakes. The interface is designed to be intuitive and familiar.

### Is Calculate84 free to use?

The app is available for free, but it does include in-app purchases and advertisements. This allows users to try the core functionality before deciding to invest further.

### What devices is Calculate84 compatible with?

This application is designed for use on iPhones, offering a portable and accessible graphing calculator solution. It is intended to be a modern alternative to traditional physical calculators.

### Who would benefit from using Calculate84?

Students, educators, and anyone who regularly uses a graphing calculator for math, science, or engineering tasks would benefit. It's particularly useful for those who prefer a digital interface or are accustomed to TI-84 calculators.

## Version history (last 5 releases)

### 3.0.3 — 2026-08-17

Create and evaluate piecewise functions, explore clearer in-app function guides, and enjoy smoother equation editing with performance and stability improvements.

### 3.0.2 — 2026-08-11

Improved graphing, equation editing, and table reliability, with additional performance and stability fixes across iPhone, iPad, and Mac.

### 3.0.1 — 2026-08-03

Fixed an issue where the equation table could lose your place after switching apps.

This update brings a major 3.0 refresh to graphing, equation editing, function help, and everyday calculator workflows.
- New smoother graphing with better panning, zooming, tracing, labels, highlights, and inline graph previews
- Redesigned equation table that feels faster, scrolls more naturally, and keeps your recent work easier to follow
- Function help previews now show examples and argument details directly where you need them
- New support for implicit graphing, fixed-range graph inputs, clearer trace labels, coordinate labels, and stat plot previews
- Improved equation editing with better cursor movement, selection, copy/paste, matrix editing, and math formatting
- New interactive number and matrix adjustment controls for quicker editing and exploration
- Better layouts on iPad, Mac, and large screens, including keypad sizing, split controls, spacing, and keyboard handling
- Refreshed search with smoother animations, cleaner results, and improved accessibility behavior
- Clearer graph and equation rendering, especially for labels, large text, complex expressions, and formatted results
- Performance and reliability improvements across graphing, tables, equation solving, keypad resizing, and daily use

### 3.0.0 — 2026-08-01

This update brings a major 3.0 refresh to graphing, equation editing, function help, and everyday calculator workflows.

- New smoother graphing with better panning, zooming, tracing, labels, highlights, and inline graph previews
- Function help previews now show examples and argument details directly where you need them
- New support for implicit graphing, fixed-range graph inputs, clearer trace labels, coordinate labels, and stat plot previews
- Improved equation editing with better cursor movement, selection, copy/paste, matrix editing, and math formatting
- New interactive number and matrix adjustment controls for quicker editing and exploration
- Better layouts on iPad, Mac, and large screens, including keypad sizing, split controls, spacing, and keyboard handling
- Refreshed search with smoother animations, cleaner results, and improved accessibility behavior
- Clearer graph and equation rendering, especially for labels, large text, complex expressions, and formatted results
- Performance and reliability improvements across graphing, tables, equation solving, keypad resizing, and daily use

### 2.6.4 — 2026-05-21

- Added support for seeding random number results, including rand and randInt.
- Made graph windows and calculator state restore more reliably.
- Improved iPad and Mac window layout so the calculator fits better around system controls.
- Refined large-text and accessibility behavior across calculator screens.
- Fixed several edge cases in matrix, list, and math function handling.
- Added stability improvements throughout the app.

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## More apps by Century Light LLC

- [Calculate84 for Institutions](https://appshunter.io/ios/app/calculate84-for-institutions/id1635187664)

All apps by Century Light LLC: https://appshunter.io/developer/1459712792

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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 2026-08-28.*