# 16C Scientific RPN Calculator — user reviews

> 10 indexed App Store user reviews of 16C Scientific RPN Calculator by nguyen ngoc khanh, rated 3.42/5 from 12 ratings.

- Source: https://appshunter.io/ios/app/16c-scientific-rpn-calculator/id1247206380/reviews
- App overview in markdown: https://appshunter.io/ios/app/16c-scientific-rpn-calculator/id1247206380.md
- Rating breakdown: 5★ 4 · 4★ 2 · 3★ 2 · 2★ 3 · 1★ 1

## Most critical reviews (10 lowest-rated)

### 1/5 — Not s real 16c

*2020-10-23, version 1.0*

Hex magnitudes are limited to FFFF.
I bought it to escape that limitation in another calculator and was disappointed. I'll delete it. 
Should have read the reviews.

I made the mistake of trying it again on my new ‘phone.
There is no way to close it on my XR. There is no drag- up bar, and the app will not rotate out of landscape orientation.

**Developer response:** Thank you for your review.

### 2/5 — Hard to read

*2021-03-25, version 1.0*

Can’t read the yellow labels.  Really ruins an otherwise good app.

Five stars if they fix it.

### 2/5 — has an AND problem

*2017-07-09, version 1.0*

everything went fine until I tried to AND 0x72 with 0x3f Th eresult was 33 not 32 tried using binary and got the same results.

**Developer response:** Thank you for your review. We will fix this problem.

### 3/5 — Accurate but needs UX love...

*2019-08-08, version 1.0*

UPDATE 190808:  Dev said they'd fix readability but no change _many_ months later, support seems lacking.  shame too, had potential.
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It's a surprisingly accurate 16c emulation (though I've found a few minor issues).   Alas, color of keypad "shiny" background towards center makes yellow labels almost unreadable.  needs a darker background with more contrast.  Also not sure email sent to support regarding bugs is getting through, no replies received. 

In general decent solid emulator -- with some UX tweaks and a few bug fixes it would earn 5 stars!

### 4/5 — Great HP16C emulator

*2021-05-14*

This is a great HP16C emulator — I use it all the time — the only suggestion would be to make the chars easier to see and maybe to have an original HP calculator skin — it would be 5 stars if the kbd chars were easier to see — but it is a great calculator :)

### 4/5 — Good but poor readability

*2019-05-05, version 1.0*

I loved my HP 16 C. (I wonder whatever happened to it.) This app is an inexpensive emulator that does a good job.

My biggest complaint is poor readability of the yellow function labels, especially in the central area. Please get rid of the background color gradient!

### 5/5 — Works a charm!

*2020-04-20*

Runs my old (not very mind taxing) HP16C programs fine.  Function labels could be darker.  0x0c should be 'C', not 'c'.

### 5/5 — Great HP 16C Emulator!

*2020-03-04*

This runs great! Programs even run also!
I’ve never used a real 16C but I have the manual and can really get a feel for how it worked. Great for learning and the programs even useful - I wrote a percentage increase program and also typed in the factorial example up on Wikipedia!

### 5/5 — Not the 16c! (Fixed)

*2019-03-10, version 1.0*

The developer has fixed this issue and everything seems to be working. 

Original Review:
I bought this for the programmer’s tools like hex to decimal, binary conversions, etc. This app does not not have any of this. Instead, it the HP11c engineering calculator. I have both the real HP16c and HP11C, so I’m sure. What a bummer!
 IT IS NOT WHAT IS ADVERTISED!!!

**Developer response:** Thank you for your review. We’ll fix this problem.

### 5/5 — It will do more than 16 bits

*2019-02-28, version 1.0*

Been looking for a 16c since the old app I have was never updated to iOS 11.  Looks like it works in two minutes playing with it (and I do have a real 16C at home). To respond to an earlier review... it will do more than 64 bits.  Go to decimal mode, enter 32 and then do f wsize.  That sets the word size.  It will even do 64 bits, you have to scroll the display with g arrows (on the STO RCL buttons).  Not convenient but it works and matches what I recall of the 16c (I have not used that particular function in years).  The dots on either side of the h (or b, d, o) indicate that scrolling is needed.  Thanks for the app, now I can finally upgrade from iOS 10...

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*