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Calculate84

Calculate84

Intended for use with TI-84

52K ratings
339 reviews
With Ads
📚 Education
📊 Productivity
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • August 17, 2019
  • May 21, 2026

Features

Developer

Century Light LLC
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🧾$2.99 - $29.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐339
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🔄6+ apps
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❓5 answered
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📦~ in 2 weeks
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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 52K 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

2.6.4

May 21, 2026

- 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.

More

Subscription plans

Monthly Pro Subscription

Speed up your workflow with Pro!

$2.991 Month
3 Days trial
How to cancel Calculate84 subscription ⁉️
6

In-App Purchases

$6.99

Lifetime Subscription

Go Pro Forever!

User reviews

Most RecentHighest RatedLowest Rated

Awesome!

This calculator is great I love how much it resembles the hand held version but I also really appreciate the little updates that allow you to edit your equations more easily than the hand held TI84 (or at least the one I have). This App is great I would highly recommend it.
Alex^^^Alex^^^

5 Years in and Still my Go-to Calculator app

Way past school age at this point but I still use this for all my calculating needs.

A definite must-have for any smartphone user
A user with a thoughtA user with a thought

iPhone user

If you are an iPhone user and need a calculator that is simple and easier to use with Trigonometry this is it !!!
Black Market OutpostBlack Market Outpost

Amazing

Works just like the real thing!
Roses4Daisie17sGera75niumsRoses4Daisie17sGera75niums

Weird

Kinda weird layout
E$.E$.
See 334 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.