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Calculate84

Calculate84

Intended for use with TI-84

53K ratings
364 reviews
With Ads#55 in free Education
📚 Education
📊 Productivity
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • August 17, 2019
  • August 31, 2026

Features

Developer

Century Light LLC
✨Promote your app ✨
Calculate84 screenshot #1 for iPhone
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iphone
ipad
🧾$6.99 - $29.99
In-App Purchase↘︎
📉no. 55
Charts↘︎
📌Ready
Reviews summary↘︎
⭐364
Reviews↘︎
📝40+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 1 week
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🖼️Get Icon
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About

This app offers a modern graphing calculator experience on your iPhone. It features fast, interactive touch-screen graphing, scrollable windows, and intelligent error messages for a more intuitive user experience. Designed to be a usable alternative to physical graphing calculators.

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

What users say

Summarized from real user reviews of Calculate84. Based on 53K reviews and a 4.8/5 average, it highlights the 7 positives and 5 negatives reviewers mention most about this Education app.

Positive things

  • 👍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

Negative things

  • 🐛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
See all reviews

What's New in Calculate84

3.0.4

August 31, 2026

Improved equation history and result formatting, more reliable Pro purchases, better accessibility, and fixes for math input and stability.

Subscription plans

Monthly Pro Subscription

Speed up your workflow with Pro!

$2.991 Month
3 Days trial
How to cancel Calculate84 subscription ⁉️
4

In-App Purchases

$6.99

Lifetime Subscription

Go Pro Forever!

Charts

Top Free

📉 55-1

Education

This app dropped -1 position in Education chart.

Last updated on September 17, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Font customization/Old font?

I preferred the font that the app used to use, each update has changed to a font I dislike more than the last. I would be very happy if you added font customization so I can use a font I prefer. Other than that, I love this calculator and just wish it could be even better. If so, I would give 5 stars.
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Tristan AW.Tristan AW.

Calculate84 is reliable and has minimal advertisements for the quality

I am very satisfied
Lester98724Lester98724

Locking graphing behind a paywall insane.

horrible quality, pop up ads, janky interface, restricted graphing. you can just bypass it with the trace functionality but it’s absolutely outrageous. Horrible app.
brodie oreficebrodie orefice

Amazing app!

I’m an educator and the good this app has done for some of my students who can’t afford a calculator is inestimable
MadasteelMadasteel

Yeee

It’s tuff
BootietiklerBootietikler
See 359 more reviews

Developer apps

Calculate84 for Institutions
Calculate84 for Institutions

Intended for use with TI-84

📚 Education

(12)

$17.99
See developer apps

User experience

🐞

Reported Bugs

4 issues

Crashes when using 2-sample T/Z interval functions

Bug

Incorrect results for inverse trig functions

Bug

Issues with graphing parabolas and tracing points

Bug

Regression equation not displayed correctly

Bug
✨

Requested Features

5 requests

Add TVM solver functionality

Feature

Implement more regression types

Feature

Allow disabling of ads for free users

Feature

Restore previous purchase benefits

Feature

Optimize for mobile experience instead of emulating physical calculator

Feature

FAQ

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.