# RPN vs Calc

The clearest difference is price: Calc at Free against RPN's $1.99. Calc also leads on update cadence (fortnightly vs every 3 months). RPN's advantage is ratings volume (8 vs 2) and iOS requirement (12.0 vs 18.0). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Calc is free to download; RPN costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for RPN against 5.0 for Calc. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

RPN ships an update every 3 months, Calc fortnightly. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | RPN | Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (8 ratings)](https://appshunter.io/ios/app/rpn-55-sd/id1469907917/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/calc-u-59/id6761413142/reviews) |
| Number of ratings | **8** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 17 MB | 9 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Martin Erzberger](https://appshunter.io/developer/1889469770) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-55-sd/id1469907917)

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable scientific calculator from the 1970s. It includes a 100-hour digital timer, clock functions, and original HP programs.

**Highlights:** Photo-realistic look-and-feel, Programmable with conditional branching, 100-hr timer and 12/24-hr clock, Original HP programs built-in, Extended features for enhanced usability, Sharing via email, AirDrop, and more

**Features:** macOS Compatibility

**In-app purchases:** none


### Calc

[App page](https://appshunter.io/ios/app/calc-u-59/id6761413142)

Explore the inner workings of classic TI-59, TI-58, and TI-58C calculators. This tool offers cycle-accurate emulation, a debugger to inspect code and registers, and a functional paper tape printer recreation. Load and save programs using magnetic card emulation and state files.

**Highlights:** Cycle-accurate TMC0501 processor emulation, Integrated debugger for program and register inspection, Functional PC-100C paper tape printer recreation, Magnetic card reader for loading/saving programs, State file loading for instant machine configuration, Solid State Module support

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Is Calc free?

Calc is free to download, with no in-app purchases.

### Which has better reviews, RPN or Calc?

RPN and Calc are both rated 5.0 out of 5 on the App Store, from 8 and 2 ratings respectively.

### Do RPN or Calc have ads?

Neither RPN nor Calc shows ads.

### Which is updated more often, RPN or Calc?

RPN ships an update every 3 months, and Calc fortnightly. Most recently, RPN was updated on October 31, 2026 and Calc on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*