Touch Fin RPN is an RPN financial and scientific calculator that implements most features of the industry-standard HP-12C, including programming functions.

It also implements a scientific RPN flavor that implements most functions of the beloved 11C. And even more flavors (10C-like, 16C-like) can be purchased within the app.

What’s New

Version 4.21

Updated libraries

Ratings and Reviews

3.8 out of 5
68 Ratings

68 Ratings

ItsCosmo ,

The best HP as far as I’m concerned

As a longtime HP user, I own many of the physical calculators and even purchased HP’s official 15C app. That app is OK but had some usability issues that HP never addressed, and appears to be abandoned now.

When I tried the free version of Touch RPN, I knew I had a winner. The detailed rendering, keyboard feedback and vertical (portrait) layout are just what one would expect in a top of the line product. I purchased the Scientific Premium version and could not be happier. It was an easy decision to delete the HP app.

The negative reviews you see here are either critical of the all-in-one version vs separate app approach, or from people who don’t know what RPN is.

I have no concerns about the all-in-one version, but I do have a gripe. To say that an app supports Family Sharing when its only purchase option is via IAP is a flat-out scam, and this developer tarnishes its integrity by making such a claim. I wish Apple would put an end to this deceitful practice.

FlyBoyMcCall ,

Versatile RPN Calculator — Well Designed

This is a well-designed, smoothly functioning, RPN calculator. I have not done a thorough test on accuracy but it appears to be accurate. Because the calculator is free, unobtrusive ads run in the upper right hand corner. Even the ads are well designed to be visible but not in the way. The designer has a flair.

jski$$$ ,

Quality product!

I have spent quite a bit of time with the software engineering calculator, the 16i. I have discovered ZERO problems to date, BUT of course, as a software engineer, I have to admit that guarantees ZERO.

So far, it appears to be an excellent, quality product. I'm glad to know the HP-16C lives on.


Elvis Pfutzenreuter
51.9 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Portuguese

Age Rating
Rated 4+
© Copyright (c) 2014, 2017 Elvis Pfutzenreuter.
In-App Purchases
  1. Financial Premium $4.99
  2. Touch Fin app transfer Free
  3. Touch 11i app transfer Free


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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