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Calculate84

Calculate84

Intended for use with TI-84

54K ratings
386 reviews
With Ads#198 in free Education
📚 Education
📊 Productivity
Free
In-App PurchasesWith Ads

Details

Released
August 17, 2019
Updated
August 31, 2026

Features

Developer

Century Light LLC
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iphone
ipad
🧾$6.99 - $29.99
In-App Purchase↘︎
📊no. 198
Charts↘︎
📌Ready
Reviews summary↘︎
⭐386
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
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What users say about Calculate84

Reviews of Calculate84 are mostly positive: the Education app is rated 4.8/5 from 54K App Store ratings. What users like most: identical to TI-84 calculator, seamless and intuitive user experience. Top complaints: occasional bugs and crashes, missing some advanced features like regression types. Summarized from real user reviews.

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.

6

Subscriptions & In-App Purchases

Monthly Pro Subscription

Speed up your workflow with Pro!

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

Charts

Top Free

📊 198

Education

The app has maintained its position at 198 recently.

Last updated on November 2, 2026.

User reviews

Most RecentHighest RatedLowest Rated

The best

Has saved me probably days worth of time through convenience throughout high school and college. It instantly became my main calculator for regular use and I haven’t had to search through my backpack for my real calculator at all anymore. Especially for those doing or considering stem, it’s the best.
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WWafflesarebos

Great Functionality!

I started using this app for my classes in highschool such as AP precalculus, AP Physics, and various other math classes, and the resources that this app provides helps a lot when it comes to solving problems quickly, especially at home. It is definitely more convenient than a web version on a computer or laptop, and is very quick to use, as it is even faster than the average physical ti-84 calculator. I had no problems using this app whatsoever, and I highly recommend it for everyone in high school or college, or in any field that is very math-intensive.
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Pppisbig//);8(

Very nice!

Unless you don’t know how to use every button in every way this is super perfect max
BFBenji fyshi

Lfg

Goated calculator I love calculus
RRockthestone

Help with matimaticas

Muy bueno 🥹
HHhhhhhhhhhhhhhhhhhhhħ
See 381 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.