Calculate84

Name: Calculate84
Rating: 4.8 (52305 reviews)
Author: Century Light LLC

Intended for use with TI-84

Free · In‑App Purchases

52K Ratings
Age Rating

13+
Years
Chart

#199
Education
Developer

Century Light LLC
Language

EN
English
Size

74.2
MB

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

Ratings & Reviews

4.8

out of 5

52K Ratings

Need a TI-84 replica that's perfect in every way? GET THIS APP NOWWW!!!
10/01/2025
delicious mango sago
I had just finished the last page of my Calculus calculator-required work when a wave of overwhelming gratitude for this app tsunami-ed onto me, invigorating me to extol its virtues to its deserved extent. I love everything about this app. It has literally every single feature that a TI-84 calculator has, and in some cases the features have been upgraded to be even more intuitive than the original (there are undo and redo buttons! you can search for any specific commands you need!) The graph is crisp and immediate, no waiting for the graph to load required. But these are just the basics; this app goes far and beyond, reaching for excellence. Every minute detail is felt during its use, like the haptics, which vibrate each time a button is pressed so the user has tactile confirmation of everything entered, or the über-sleek user interface, which provides an elegant look while making graphing and finding the buttons you need incredibly efficient. If you want a glorious, beautifully designed, jaw-droppingly spectacular TI-84 replica for any reason, download this one and you will be swept away in a sea of paradise from the moment your thumb taps open the app. Calculate84, I love you.
Need a TI-84 replica that's perfect in every way? GET THIS APP NOWWW!!!
10/01/2025
delicious mango sago

I had just finished the last page of my Calculus calculator-required work when a wave of overwhelming gratitude for this app tsunami-ed onto me, invigorating me to extol its virtues to its deserved extent. I love everything about this app. It has literally every single feature that a TI-84 calculator has, and in some cases the features have been upgraded to be even more intuitive than the original (there are undo and redo buttons! you can search for any specific commands you need!) The graph is crisp and immediate, no waiting for the graph to load required. But these are just the basics; this app goes far and beyond, reaching for excellence. Every minute detail is felt during its use, like the haptics, which vibrate each time a button is pressed so the user has tactile confirmation of everything entered, or the über-sleek user interface, which provides an elegant look while making graphing and finding the buttons you need incredibly efficient. If you want a glorious, beautifully designed, jaw-droppingly spectacular TI-84 replica for any reason, download this one and you will be swept away in a sea of paradise from the moment your thumb taps open the app. Calculate84, I love you.
Great calculator but some bugs
04/23/2023
Too kool for school.
This calculator is a great way to avoid spending $120-$200 on a Ti84 calculator. However I have found some bugs when it come to running some of the statistic test such as 2propztests etc. however for the majority of your functions, you can’t get a better calculator. -response to developer: The errors I found were in the statistics tests under “STAT —> TESTS”: 3,4,6,9,0,B,and E. Basically any distribution with 2 samples or lists would not provide z score, p value, etc or necessary test statistic/parameters. (It would merely summarize the data I entered and not provide the solution.) -2nd response: Here’s one but I won’t do one for all the tests I listed as they run on similar principals. 2-sampleZtest Standard deviation 1: 4 Standard deviation 2: 5.1 X bar 1: 13.6 N1: 200 X bar 2: 11.6 N2: 11.6 Null hypothesis: not equal to mu ——- Expected answer: Z=4.36… P=1.28…* 10^-5 X bar 1 : 13.6 X bar 2: 11.6 N1: 200 N2: 200 ——— Received answer: It used to summarize the entered data but now appears the same p and z values are now presented. Thanks for resolving the issue.

Developer Response
👍 glad the bugs got resolved!
Great calculator but some bugs
04/23/2023
Too kool for school.

This calculator is a great way to avoid spending $120-$200 on a Ti84 calculator. However I have found some bugs when it come to running some of the statistic test such as 2propztests etc. however for the majority of your functions, you can’t get a better calculator. -response to developer: The errors I found were in the statistics tests under “STAT —> TESTS”: 3,4,6,9,0,B,and E. Basically any distribution with 2 samples or lists would not provide z score, p value, etc or necessary test statistic/parameters. (It would merely summarize the data I entered and not provide the solution.) -2nd response: Here’s one but I won’t do one for all the tests I listed as they run on similar principals. 2-sampleZtest Standard deviation 1: 4 Standard deviation 2: 5.1 X bar 1: 13.6 N1: 200 X bar 2: 11.6 N2: 11.6 Null hypothesis: not equal to mu ——- Expected answer: Z=4.36… P=1.28…* 10^-5 X bar 1 : 13.6 X bar 2: 11.6 N1: 200 N2: 200 ——— Received answer: It used to summarize the entered data but now appears the same p and z values are now presented. Thanks for resolving the issue.
Developer Response 04/25/2023
👍 glad the bugs got resolved!
Must have for students
03/20/2025
Error367091:UserNotFound
I hate how expensive the TI calculators are (and the prospect of ewaste, as well as buying something my phone or laptop can do better, and supporting a single company monopoly), but also like to use something allowed on tests (so I can build skills for testing). This scales well on iPhone and iPad while still being fairly accurate to TI’s UI. (It does half screen, third of screen, full screen, slide over, etc super easily, so I can use it with procreate, Freeform, notion, etc smoothly). It’s also extremely convenient to not have to carry a giant old fashioned calculator with me.I think I prefer Desmos for a lot of tasks, but this helps for testing and has more specialized functions that would be done with Mathway or misc sites.The purchase model is also wonderful. I bought it years ago for highschool and can continue using it through college
Must have for students
03/20/2025
Error367091:UserNotFound

I hate how expensive the TI calculators are (and the prospect of ewaste, as well as buying something my phone or laptop can do better, and supporting a single company monopoly), but also like to use something allowed on tests (so I can build skills for testing). This scales well on iPhone and iPad while still being fairly accurate to TI’s UI. (It does half screen, third of screen, full screen, slide over, etc super easily, so I can use it with procreate, Freeform, notion, etc smoothly). It’s also extremely convenient to not have to carry a giant old fashioned calculator with me.I think I prefer Desmos for a lot of tasks, but this helps for testing and has more specialized functions that would be done with Mathway or misc sites.The purchase model is also wonderful. I bought it years ago for highschool and can continue using it through college
THE BEST, PERIOD.
10/10/2021
Tactical-Nawhal
I’m a 3rd year mechanical engineering undergrad, and holy lord crap this is the greatest thing since Betty White. 1. It feels goodI’ve dealt with many apps that have claimed to be this, or have tried to be this, but this is the first that actually feels like I’m using a graphing calculator. As someone who swears by TI-84, it’s incredibly intuitive and has lots of added features to make it more user friendly. They did a really good job of incorporating the power of smartphone to augment the traditional TI-84 experience. 2. Responsive developersWhen I first got this app it was still a work in progress, and I sent in feedback asking for them to add matrix functions. Not long after, the UI for handling matrices is by far the best from any calculator I’ve ever used.3. Portability It is still a phone app, so it’s not a perfect remedy for having a physical graphing calculator in every situation, like tests. That being said, nothing beats leaving your clunky calculator at home as you go to classes. I use this app so much more than I do my actual TI-84, which I regret spending over $100 on!
THE BEST, PERIOD.
10/10/2021
Tactical-Nawhal

I’m a 3rd year mechanical engineering undergrad, and holy lord crap this is the greatest thing since Betty White. 1. It feels goodI’ve dealt with many apps that have claimed to be this, or have tried to be this, but this is the first that actually feels like I’m using a graphing calculator. As someone who swears by TI-84, it’s incredibly intuitive and has lots of added features to make it more user friendly. They did a really good job of incorporating the power of smartphone to augment the traditional TI-84 experience. 2. Responsive developersWhen I first got this app it was still a work in progress, and I sent in feedback asking for them to add matrix functions. Not long after, the UI for handling matrices is by far the best from any calculator I’ve ever used.3. Portability It is still a phone app, so it’s not a perfect remedy for having a physical graphing calculator in every situation, like tests. That being said, nothing beats leaving your clunky calculator at home as you go to classes. I use this app so much more than I do my actual TI-84, which I regret spending over $100 on!

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

Version 3.0.2 4d ago

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Accessibility

Information

Seller: Century Light LLC
Size: 74.2 MB
Category: Education
Compatibility: Requires iOS 18.0 or later.

iPhone
Requires iOS 18.0 or later.

iPad
Requires iPadOS 18.0 or later.

Mac
Requires macOS 14.0 or later.

Apple Vision
Requires visionOS 2.0 or later.
Languages: English
Age Rating: 13+

13+

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Contains
Advertising
In-App Purchases: Yes

Annual Pro Subscription $6.99

Monthly Pro Subscription $2.99

Lifetime Subscription $6.99

Lifetime Pro Subscription $29.99

Lifetime Subscription $9.99

Lifetime Subscription $12.99

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Calculate84

Ratings & Reviews

Need a TI-84 replica that's perfect in every way? GET THIS APP NOWWW!!!

Great calculator but some bugs

Must have for students

THE BEST, PERIOD.

What’s New

App Privacy

Data Used to Track You

Data Linked to You

Data Not Linked to You

Accessibility

Information

Supports

Family Sharing

More by Century Light LLC

Calculate84 for Institutions

You Might Also Like

Graphing Calculator X84

Ncalc - Graphing Calculator 84

Desmos Graphing Calculator

Desmos Scientific Calculator

BigFuture School

Taculator 84 Graphing Calc

Common App

Gradescope

Edpuzzle

Navigate360 Student