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Calculate84

Calculate84

Intended for use with TI-84

52K ratings
357 reviews
With Ads#65 in free Education
📚 Education
📊 Productivity
Free
In-App PurchasesWith Ads

Details

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

Features

Developer

Century Light LLC
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Calculate84 screenshot #1 for iPhone
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iphone
ipad
🧾$6.99 - $29.99
In-App Purchase↘︎
📉no. 65
Charts↘︎
📌Ready
Reviews summary↘︎
⭐357
Reviews↘︎
📝40+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 2 weeks
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

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

3.0.3

August 17, 2026

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

More

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

📉 65-6

Education

This app dropped -6 positions in Education chart.

Last updated on August 28, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Wrong answers for exponential equations

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!
SolanoideaSolanoidea

Y’all took away ad free for early adopters.

Restore purchase doesn’t work either. What a shame. That deserves a 1 star.
k4r000k4r000

has saved my life

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

Lagging past week

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.
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jrjdsbhdfjdjrjdsbhdfjd

literally can calc big numbers

great job
jdhardy000jdhardy000
See 352 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.