# RPN vs Calc

The clearest difference is price: Calc at Free against RPN's $1.99. Calc also leads on rating (5.0 vs 4.4) and update cadence (every 2 weeks vs every 6 months). RPN's advantage is ratings volume (14 vs 2) and iOS requirement (12.0 vs 18.0). On ads, in-app purchases and device support 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.

Calc holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: RPN has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 71% of RPN's written reviews are positive against 100% of Calc's.

RPN ships an update every 6 months, Calc every 2 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | RPN | Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.4 (14 ratings)](https://appshunter.io/ios/app/rpn-35-sd/id956224485/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calc-u-59/id6761413142/reviews)** |
| Number of ratings | **14** | 2 |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Paid | **Free** |
| Size | 14 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-35-sd/id956224485)

This app emulates the first pocket scientific calculator, offering a photo-realistic vintage experience. It simulates original operating speeds and unique arithmetic bugs, with optional modern enhancements like non-volatile registers.

**Highlights:** Photo-realistic look-and-feel, Multiple vintage skins, Vintage and Enhanced modes, Optional key-click and key-glow, Swipe to correct input, Display stack and memory registers

**Features:** macOS Compatibility

**In-app purchases:** none


### Calc

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

This app emulates the classic TI-59, TI-58, and TI-58C calculators with cycle-accurate precision. It includes virtual magnetic cards, a printer, software modules, and a CPU-level debugger for in-depth analysis. Bring your old programs back to life or explore the inner workings of these vintage machines.

**Highlights:** Cycle-accurate TI-59, TI-58, TI-58C emulation, Virtual magnetic card reader/writer, PC-100C printer emulation, CPU-level debugger, Solid State Software module support, iCloud syncing for state files

**Features:** iPhone Duo 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?

Calc is rated higher. RPN averages 4.4 out of 5 from 14 ratings, while Calc averages 5.0 from 2 ratings.

### 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 6 months, and Calc every 2 weeks. Most recently, RPN was updated on November 4, 2026 and Calc on November 5, 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.*