Calculate84 4+

Intended for use with TI-84

Century Light LLC

    • Free
    • Offers In-App Purchases


1. Fast, Interactive Touch-Screen Graphing
2. Everything is where you’d expect it to be
3. Scrollable windows (no more spamming the up arrow keys)
4. Intelligent error messages
5. Convenient

1. We (the creators), once relied on graphing calculators, and after installing countless, similar apps, we couldn’t find anything useable. Hence, we made our own.

2. Before launching on the App Store, we personally worked with a limited, yet sizable, number of students to continuously improve the app.

1. Press the red feedback button.

What’s New

Version 1.9.9

Bug fixes and performance improvements.

Ratings and Reviews

4.8 out of 5
118 Ratings

118 Ratings

Too kool for school. ,

Great calculator but some bugs

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!

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 good
I’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 developers
When 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 hobbit eman ,

good but missing a lot of important stuff.

so overall this is a pretty good graphing calculator emulator for your phone. I like how it vibrates when you hit buttons on it to let you know that you actually hit the button. so far the answers it gives all seem to be correct also. unfortunately, it is missing a lot of important things. It can do linear regressions, but no other types of regressions. I assume the developer is working on adding those but they should really be near the top of the list. they are part of basic pre-calc so they should be added asap. I will say that as of right now it is definitely the best one available for free because the other ones lock literally everything behind paywalls but still let you download it for free which just seems like a scummy way of boosting downloads. if you add in regressions, i’ll bring my rating up, but it wont be 5 stars until all commands are available.

App Privacy

The developer, Century Light LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers

Data Linked to You

The following data may be collected and linked to your identity:

  • Contact Info
  • Diagnostics

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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