Ncalc - Graphing Calculator 84

• Calc84 One Month — $1.99/month
• Calc84 One Month — $2.99/year ($0.24/mo)
• Calc84 Pro Lifetime — $5.99
• Graphing Calculator Plus — $5.99

Last verified 6 Aug 2026

4.6 4941 ratings · App Store

1. 5/5It’s GREAT!

   Just like the real thing, and I have two Ti-84 calculators. I’m only giving ‘5’ stars because I do believe it could use some polishing up to ‘appear’ like the real thing, and I do believe that the creators of this app might be surprised at how many more apps they would ‘sell’. I always ‘purchase’ to get rid of ads, which are totally annoying. You would sell FAR more if you gave your buttons more ‘depth’, with dark tiny spacing to define the button away from its frame; the way it is, currently, is way too duo-dimensional. Add more depth and shadowing to where the cosmetics are more realistic and I would wager that your sales would increase to where people would pay for your product more than just wanting the ‘free’ version. Regardless, this is an excellent app - I purchased the ‘Lifetime’ upgrade!

   Vox53 · 6 Aug 2026

2. 5/5This is great 🤩

   Out of what I know it lets me do almost everything on a normal expensive graphing calculator, but for free. Some things are locked unless I think until u buy the premium. But barely anything is locked. There are all of the buttons on a normal graphing calculator. You can click the same buttons to get the same outcome like a normal calculator. This makes it very less complicated than other calculator apps. Although, during some tests I am not allowed to use a phone which makes sense. I can only use a real calculator. That’s the one thing that I cannot use it for.

   Buddy the Frog · 6 Aug 2026

3. 1/5Annoying pop ups requesting reviews, no help/instructions and operations changes between ti84

   Overall this calculator works pretty well. However are no instructions on how to use it, so if you're familiar with a TI84 for instance, you can figure it out but its not identicial in operation. There is a 'help' section but if you click it, it says there is nothing there. Also the app continues to do a pop up asking for a 5 star review, so I'm leaving a 2 star as a result. I paid money for this app, I'm not going to be bugged about reviews after paying money. One minor issue is the alpha button's color does not match the alpha button key options above the keys. This is usually matching. My overall review is yes this app works, it'll get the job done, but if you want a computer version of the TI84, look elsewhere as some of the commands within this are complicated and there is no guidance. Calculator unable to handle equation 14!/(3!11!). Gives the error message "error: syntax error" . Whereas my portable regular TI84 calculator can handle the problem without issue.

   Toadsroberts · 6 Aug 2026

4. 5/5Beware serious bugs

   I have been generally impressed with the capability of this calculator, and it is my "go to" calculator for vector operations. However, it has some serious and unexpected bugs. Some polar-rectangular conversions have unexplainable errors using particular angle values, and some list functions provide grossly wrong answers (wrong sign, wrong magnitude). Update: The author responded with a work-around for the polar conversion issue. The multiplication of lists still gives unexpected results

   toobafan · 6 Aug 2026

5. 3/5Would rate 5, if not for one glaring problem

   I bought the premium service because I was very satisfied with the app initially. However, there is one glaring problem. Only some numbers can be seen with the full range of Result formats after you tap on the answer and click on “More”. For example I would like to see a number in Engineer or scientific notation, but one answer will not have these formats shown (after clicking on more) whereas others will. It’s a very irritating problem as the wide variety of results is really useful when available, but is really frustrating when it isn‘t.

   VaprRIZE · 6 Aug 2026

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