4.8 (32.7K)
67.9 MB
Age rating
Current version
Century Light LLC
Last update
3 weeks ago
Version OS
15.0 or later
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User Reviews for Calculate84

4.78 out of 5
32.7K Ratings
1 year ago, 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.
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3 years ago, 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!
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4 years ago, 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.
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3 years ago, Eaurius
Forgot my calculator when I needed it most
I am amazed, continuously, at what developers can do these days. I forgot my TI-84 at home when I had every intention of grinding through some stats homework at school (I’m in college and taking a few online classes). Obviously, it is no substitute on the exams, but when I figured out I could do combinations and permutations and summations, I was so happy!!! No more switching calculators between backpacks, I’ve found my solution. Keep working on the apps function and the developers will make money off of this. There is even a copy function if you click the equation (highlights pink) and you click enter, just like normal. I look forward to testing the limits of this calculator and seeing what changes can be made. Good luck!
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9 months ago, Epicurelius
Great for online school
If you’re an online student there’s honestly nothing better than this app. Not only does it perfectly match store bought calculators, it actually makes using it simpler. For example, when finding the peak of a curve, with a normal calculator you have to find 2 points close to the peak, then click to find the max/min. With this app, it automatically tells you max and min of peaks and valleys in graphs. When problems have multiple steps, it’s the small stuff that makes your life ever so slightly easier that you tend to remember. If you don’t need a physical calculator your best bet is down loading this app.
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4 years ago, Дима_и_Вероника
I never usually leave reviews, but this app is great.
I am an engineering student, and I am always in need of a calculator handy. There’s quite a few great apps out there that can be used as a graphing calculator, but getting used to different user interfaces is always a pain when switching between calculators. I’m used to the TI-84 Plus CE, and this calculator is exactly identical to a TI-84 Plus. Not all the functions of the calculator are available yet (the apps button currently does not do anything) but most of the functions that are necessary to my work are available (like matrices and trig particularly). Overall, this is a great app and I never usually leave reviews, but had to give my opinion for amazing app.
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2 years ago, ejeisishhahahabxx
This app is seriously awesome. Just one thing I would recommend for some forgettable people like me…
There’s functions such as the NormalCDF and NormalPDF functions. On my physical calculator, there is a menu that pops up to input numbers like it does with the PropZInterval function. It lists the Values, you put the numbers in, and then press calculate. It’s just slightly tedious having to enter in the numbers inside the parenthesis, because you have to remember where the numbers go. Some calculators have this option, some don’t. if this calculator could have that, I would be set for life on this app. Really an epic app. Thanks.
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3 years ago, adsylrod
Best at its price point
Super smooth and works almost exactly like a Ti-84 from my very limited testing. The Ui is well designed and there are no ever present intrusive ads. It was actually recommended by one of my teachers when I was in algebra 2 as a possible replacement for a calculator. Still, of course you can’t use something like this on a test, and as far as I can tell it only has linear regressions, which makes its use cases limited as years go by. Still, it is definitely worth downloading for younger students who don’t want to spend the equivalent of 60 popeye’s chicken legs for a calculator.
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2 years ago, reef716
So sweet
Ive been using this through my math classes for years to avoid spending $100+ on a calculator and its so amazing. recently they updated the app and wrote an honest message about how they were finally going broke, but they knew people couldnt always afford it and they wanted to keep things accessible, so they clarified they would be adding ads, and honestly thats all I ask of apps. Honesty and respect. I love that they just talked to their users like human beings and still care and arent making people pay for it. I will watch a million ads for you guys. thank you
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2 years ago, **insert nickname***
Used it for like 5 minutes and woah
I know how to use a ti-84, they’re expensive and I can’t take one home but I’ve got one on my computer that does the same thing. I needed to punch in a bunch of derivatives of inverse functions which is a pain to do on the computer. I resorted to using Photomath to try and get it to solve but that doesn’t work so on a whim I downloaded this app and omg. It does exactly that you’d expect, all the shortcuts are the same, it’s got the capability to do all the calculus I need, whoever reads this from development go pat the creators on the back because I am so thankful
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2 years ago, ddaaadddd
Honest devs
I loved this app and used it for years, but recently they added advertisements. Obviously this was an inconvenience, but the devs came clean and said that they just needed some cash to keep the app up. For devs to be honest like this is something that everyone should respect especially with Apple taking 30% of App Store purchases. I bought premium for life for the maximum amount. Thanks Calculate84 for being a great app with honest devs! I highly recommend showing at least some support to the devs by getting premium even if you do move the slider to the lowest amount.
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2 years ago, wood chuck37
I have wasted too much time trying to get this calculator to work. I was trying to do Horizontal launches for physics but apparently the app doesn’t do that. I was putting the same exact equations and numbers the next morning into both calculators my phone and the actual calculator, and the phone showed 0,0 as my coordinate while the actual calculator actually graphed my answer!! so I’m trying to figure out why calculator 84 is completely different from calculator 84. This app is already wasted too much of my time, Pathetic.
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2 years ago, SonAmy863
Eye-pleasing design, but can’t graph regression lines
I wanted to graph a best-fit line for my data, so I sidled over to LinReg. When I inserted Y1 for StoreRegEQ and pressed enter, it said “invalid variable and wouldn’t let me save the equation as a graphing variable. I did the same thing on a real calculator AND another calculator app—and succeeded. So there’s definitely something wrong with the app itself and not my calculations. I desperately hope you guys will fix it in the near future because your app looks really nice and I want to continue using it. I really don’t want to be stuck with the other app which has ugly visuals, tiny font, and a more expensive subscription plan (it works better, but still)
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3 years ago, pkpkpkok
Amazing app. Better than my physical TI calc
I absolutely love this app. Works perfectly, can handle all graphing duties, better functionality than the actual physical calc with the ability to highlight/select previous answers and equations quickly/scroll/graph in different colors/auto max min intercept when tracing. All settings and modes work correctly. I’m almost at the end of my semester with chem/physics/trig and this app has been right there too without fail. It’s to the point I hate exams mostly because I’m forced to use my annoying TI calc.
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5 years ago, Phoneworm
This App A Life Savior
I was learning about graphing the line of best fit in school and the teacher give it for homework, but I don’t have a graphing calculator. The teacher says that we could come tomorrow at ILT (free work time) but I can’t because I has to go to Digi Tool and finish my photoshop assignment. That when I came up with an idea to go online and search for a graphing calculator. I try many many app but non of them let me do the “4:LinReg(ax+b),” I need to pay for it. You don’t know how happy and reliefs I feel when your app allow that. You save my grade, thank you!
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2 years ago, luna1324532748
You all are doing a great job!
I’ve been using this app for years now, and i really appreciate all the work you’ve done. I’m happy to pay the money to become a member and remove ads, because you are doing important work for access to a usually very expensive calculator. I genuinely appreciate how easy it is to use, and it’s by far the best calculator app i’ve ever used. superior to any other free apps u could get, even with ads! Thank you to everyone at your team! - a very grateful student
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2 years ago, 🔫🎯👒👕
Yee (and I cannot stress this enough) Haw
This calculator is life-changing. I'm an engineering student so I constantly need to whip out una calculadora if you know what I mean. I used to first try to use Apple's built-in app, then get frustrated and find my Nspire in my bag just to do a string of simple additions. No longer. Now, I try to use Apple's built in, get frustrated, REMEMBER THIS APP, and then go on my merry way. I love the developers. So much. Only thing it's missing is a donate button. I'd pay you $20 for this app.
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10 months ago, Guru P.
Definitely would recommend
Honestly, I’ve tried so many graphing calculator apps and none of them have replicated using a real Ti84, but when I downloaded this app, I chose to use it over my physical calculator. The haptic feedback feels so good and the graphing features rival those of the popular graphing platform DESMOS. As I said in my title, I would definitely recommend this for anyone looking to simulate their graphing calculator experience on their iPhone. Thank you devs.
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3 months ago, The AWESOMEST GUY EVEr😈😈
I’m very grateful for this app. As a software engineer myself, I was more than happy to pay for this app. I saved $100 and the app provided many quality of life features like being able to scroll through menus and zoom into graphs with your fingers. Great work. Students shouldn’t have to pay hundreds for things like calculators. Tools like this make education more accessible, making our world a better place.
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3 years ago, nicknamenicjname13748483&3&
Perfect! Except for missing regressions.
This puts all other graphing calculator apps (that I’ve tried, which is numerous) to shame, and this is mostly because it WORKS. There’s no inconveniences with the workflow, for instance I can actually return to the calculation view from the graph view simply by hitting clear. Many other apps require the 2nd button to be pressed, then quit. How annoying! Oof I just realized it only has linear regressions, though. That’s almost a deal breaker. Well a diff app can be used for that...
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2 years ago, jdhshgejs
Yea that’s what I’m
Yea that’s what I’m doing it but it’s just a hard thing to do with the whole world lol I just hope that you don’t understand it I just hope that we don’t know how much we do have you do that and we don’t know how much we do a job and that’s why we are so proud of you so we don’t have a lot to say about that you don’t. Yea that’s what I’m doing it but I’m just saying yea I know it is just not really nice but I’m just saying I’m not gonna do that.
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2 months ago, Bballpsychologist
Great Calculator App!
A great calculator and has all the same functions as my TI84. Gave me a free trial without ads and then cancelled it automatically without charging me. The free version works great, the only difference between it and the paid version is a small bar up top with ads. The ads aren’t too annoying though unless an ad for French fries pops up and makes me hungry when I’m trying to do math. Overall works great!
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2 years ago, AertoneFX
Fantastic Ti-84 Emulator
This app has a beautiful interface that makes you feel just as if you are holding a Ti-84 in your hands. With this app, you seriously can not lose your Ti-84 again! All of the functions seem to be working well, the haptic feedback is just right, and the overall look and feel of this app is just amazing. Absolutely stellar, a definite recommendation for anyone that wants to make sure they always have their Ti-84 on them.
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2 years ago, charlottekko
Best calculator app by far
I love my TI-84 but I forget it all the time when I need to use it or it’s out of battery when I need it. However, I’m NEVER without my phone and this app is the best calculator app because it’s just a simulation of the same calculator that I love. It’s so intuitive if you own a TI-84 and are used to it and it functions just like it. OH AND IT’S FREE. So worth it saves me countless times in lectures or recitations when I need to whip out some quick maths.
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2 years ago, Roth64828
The best calculator
I have this calculator for 4 years and ounce I heard they needed to start putting adds I gladly paid the $7 for no ads. This is the best app calculator and instead of paying $150 for the actual calculator it’s $7 and in your pocket all the time. This has saved me carrying the bulky calculator. I have yet to run in a problem and I use this app more than any other app on my phone. Overall perfect execution from the devs.
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4 years ago, Sw1ft3r
I’ve never seen a TI84 recreated and implemented as smoothly for the price point of being free (for now). It’s been an absolute joy to work with so far and works exactly like how you would expect a TI84 to function but on your phone! I’ve used other apps that have individually either been for graphing or for being a non graphing calculator, but to finally see a free app combine the two worlds is a joy to see.
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2 years ago, BeneathOnyxSkies
Could be better
This app would be so much better if instead of trying emulate the screen readout of the physical calculator, it instead optimized for an iPhone. For example, instead of keeping division inline, allow it to reformat into a fraction-like readout. I would use another calculator app but that EE button is just too useful. Edit: thanks for the reply, that does make it a much better user experience!
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3 years ago, Junnii_
Really Underated
For my ipad Ive been looking for the best iPad calculator. After a lot of looking this has been the best one so far. Nice looking UI, very responisive, never any issue. Supports floating windows which is really convenient. No ads, excellent user experience and incredible functionality. Just like my old Ti-84 it is almost 1 to 1. Best calculator app hands down, especially for students. Loved using this for physics and calculus. Really underated, needs more recognization for what it offers.
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2 months ago, TeddyawesomeBaa
Fabulous app
I love math, algebra would be nothing with out you pookie ;) Seriously tho this app has all the capabilities of a real graphing calculator , is easy to use if you know how to use a graphing calculator and is perfect for anyone who wants to do more complex math without having their graphing calculator on them! For example I when on a trip across America and used this for my math homework and it worked exactly like mine at home!
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2 months ago, BLKreview
Great app
I’ve used this app for a number of years, even before it had ads. I couldn’t be happier with it! Every function of the calculator that I need is in this app, and I can do schoolwork any time any where. The ads pop up rarely, and I feel that they have it spaced out well. I’m grateful that they have the ads in order to provide this great app for free, great job developers, you truly are a hero!
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3 years ago, liebniz3_14
Updates have made this super legit!
I am a high school math teacher. I was always looking for a good ti84 iOS app to recommend for my students and this is definitely it. Originally it came with the caveat that they couldn’t use it when we got to regressions. But thanks to recent updates, I’m not sure there is anything I cover that my students cannot do with this. Huge thanks to the developers!
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2 years ago, Will6952:77;;)),:)$(4577(4676
I love this app!!
This app is amazing no ads, no janky controls it all just works. I am doing statistics right now in my math class which requires lots of menu navigation and it’s all so fast! I feel like a math Wizz when I use this app thank I'm amazed by the level of polish in this app I would gladly pay 2 or 3 dollars for this app without question but it’s free yet another reason as to why this app deserves 5 stars!!
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2 years ago, Huffito
I’m in a math class in high school where the T-84 is a necessity but usually use the in class set, however this is a perfect replica and works even better than the T-84. Unlike other calculator apps it has the matrices option and doesn’t require you to pay for it like another T-84 app. 10/10 would recommend, beautiful interface and user friendly.
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1 year ago, Sonic TWD Kenny
10/10 - Hands Down
As a computer science student going through the wringer of math courses, this has saved me so much time and energy (and batteries!) with how simple and intuitive this app is. Undeniably the best of the best and provides everything it says on the box. The free version works well too with unintrusive ads, though a paid version is available.
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3 months ago, Benya05
Great when it works
This new version like some of the past patches kills the app on mac. I have the app installed on my phone iPad and mac and between my work I just use 1 device, it helps me stay on track so when the mac stops working it really messes everything up. I also detest how premium is handled. I have paid 4 times in total 1 iPhone, I have premium there and 3 on my mac. Because of all the uninstalls and instals of the app they keep on going away. I am willing to pay for the app, which is great I love it when it works, to support your team but you say its a lifetime purchase. IT ISN'T.
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2 years ago, nitapeeta
just like TI-84!!!
this is exactly like a graphing calculator, it is so useful for any type of math, way better than apple’s calculator, and much more convenient as well as less expensive as buying a real calculator 10/10 would definitely recommend :) ps it’s really fun to see your teachers get mad at you for being in your phone and then showing them it’s a calculator hehe
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4 years ago, WTR50
They know where they’re going
I love the TI environment. I that is what you are after but on your phone instead this is a great app to have. The app itself is not yet full functional but they are constantly working to make it better. It loads quickly and operates smoothly. Great job guys. Can’t what for you to be able to program the calculator like the real thing!
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1 year ago, Haworthalli
Incredible Replacement
I got this as a replacement of my graphing calculator that originally had that sadly stopped working altogether. So far since I have had this, I have had no complaints. This replaces it perfectly and is more convenient since it’s there on your phone. I would highly recommend since it’s a lot cheaper and convenient.
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9 months ago, ghostyboiyeet
Peanut butter
This calculator app is a disappointment. It’s slow, unresponsive, and filled with annoying ads that pop up every few seconds. The interface is cluttered and confusing, making simple calculations feel like a chore. I’ve even encountered calculation errors on several occasions, which is completely unacceptable for a calculator app. Save yourself the frustration and look for a better alternative.
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2 years ago, jkha4
I never write reviews on apps, but this app has truly surprised me. As an engineering major, a lot of my work is done with graphing and I always forget my calculator. It allows me to do just about everything my 84 plus can do, minus the programs feature, which is okay. Overall this app is a great app and one of the biggest time savers I have yet to come by.
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1 month ago, Joe16789
Lock Screen Widget
App is incredible! there are apparently a few bugs but the only thing that could make it better for me would be to be able to add it as a widget on your Lock Screen for like super short calculations that I don’t want to have to go through the hassle of FaceID or typing my passcode. This is obviously a champagne problem but one I would go pro for honestly.
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1 year ago, Friend of Hobbits
After graphing a line I then wanted to graph a parabola. It graphed the line just fine but when I cleared the y= field and entered the formula for a parabola something weird happened. The parabola appeared in the correct position but when I pressed the trace button the points weren’t in the correct position. I had to exit out of the app and open it back up and enter the formula again in order for it to plot the correct points. Otherwise it works and looks nice.
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5 months ago, PJHPDTHGTUA
essential for high school
if you or someone you love (or know, lol) is taking a high school math class or any class where they use those $200 calculators, GET THIS APP!! coming from a junior in high school myself, i never would’ve passed my math or chemistry classes. you have no idea having a portable graphing calculator is until you’re in those classes.
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3 years ago, Satisfiedinsouth
Finally a scientific calculator that works
I needed a scientific calculator on my phone that would follow order of operations, and had a history function. Went though several apps that either had too many ads or had a hefty price tag. This app is similar to graphing calculator and has helped me when a calculator is not near!
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1 year ago, meeeeeeeee8883399
Great app, needs additions.
I love the app, and even got the paid version simply because I love the app, but there a lot of things that have yet to be added. There are no applications, so it would be wonderful if there was a way to download different TI applications for different uses. For instance, the app used for finding rational roots quickly.
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4 years ago, Math Teacher 0521
Works well, but could use some improvements
I am a mathematics educator and believe this is a great resource for my classes. However, when teaching my students about sequences and series, parametric function, polar functions, this calculator does not allow the ”mode” to switch. It says it's in the specified mode but doesn't switch. However, this is still an excellent resource for students who need it for other concepts in mathematics.
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2 years ago, Auditories
Gets most things correct
There are a few functions on this app that differ from a ti84 calculator which make it more difficult to enter calculations, as it requires you to input more variables. But it’s only a few things I’ve noticed. Also, the factorial function only sometimes works. Either it says it cannot solve the problem, or it gives me an incorrect number, so I have to use a different app for that.
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5 years ago, Mosuah
Best Calculator App
I have used TI-84s in a lot of my classes and have muscle memory from using them a lot. Other similar calculator apps are passable but many times I would have to re-enter my calculations because I’m not used that app. This app is perfect it takes what I am already accustomed to and adds to it. My favorite thing is being able to touch edit the window.
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4 months ago, WOLFY!!
I’ve used this app to study for my Stats class in the past and it was so helpful because it gives you access to so many facets that graphing/scientific calculators have. So useful if you’re someone who is in school! I also prefer to use this app over the standard calculator app that Apple provides. It’s much more immersive and supportive.
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2 months ago, jeremi.2020
Stop with the ads.
I like this app, I really do. But I get an ad every 3 minutes and it makes it really hard to get work done. I’m sorry, but this app is not adding that much value that it’s worth interrupting your workflow that often. I would respect it if it was once every 30 minutes. But the ads are excessive and taking away from value of the product. I just want a calculator that works, no complications.
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