# RePNCalc vs Calculator 17

The clearest difference is in-app purchases: Calculator 17 at none against RePNCalc's 1. Calculator 17 also leads on update cadence (every 4 days vs every 9 months) and ratings volume (990 vs 2). RePNCalc's advantage is rating (5.0 vs 4.6). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RePNCalc sells 1 one-off in-app purchase. Calculator 17 asks for nothing beyond the download.

RePNCalc holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Calculator 17 has 990 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 0% of RePNCalc's written reviews are positive against 22% of Calculator 17's, so the app with the better star average is not the one people write more warmly about.

RePNCalc ships an update every 9 months, Calculator 17 every 4 days. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | RePNCalc | Calculator 17 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/repncalc-rpn-calculator-pro/id969780852/reviews)** | [4.6 (990 ratings)](https://appshunter.io/ios/app/calculator-17-math-solver/id6452015902/reviews) |
| Number of ratings | 2 | **990** |
| Positive reviews | 0.0% of reviews | **21.5% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 5 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Michael Redig](https://appshunter.io/developer/761861103) | [AI APPS SRL](https://appshunter.io/developer/1697892814) |

## What reviewers say

### RePNCalc

[App page](https://appshunter.io/ios/app/repncalc-rpn-calculator-pro/id969780852)

This utility app offers a Reverse Polish Notation (RPN) calculator experience for iOS devices. It features customizable key layouts via swipe gestures and long-press options for stack items. External keyboard support is also available.

**Highlights:** Reverse Polish Notation (RPN) input, Swipe gesture key layout customization, Long-press stack item options, External keyboard support, Full iPad, iPhone, and iPod touch support

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Advanced Functions | $0.99 | one-time |


### Calculator 17

[App page](https://appshunter.io/ios/app/calculator-17-math-solver/id6452015902)

This app offers a user-friendly calculator with basic and scientific modes. Access calculations instantly via a home screen widget and review past computations in a saved history.

**Highlights:** User-friendly interface, Basic and scientific modes, Home screen widget, LiveActivity Standby for iPhone, Calculation history, Customizable themes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Convenient and easy to use
- 💡 Excellent free app

**What reviewers complain about**

- 🐛 Keyboard not functioning properly
- 🐛 Widget not working or slow
- 🐛 Screen sizing issues
- 🐛 Only works in portrait mode on iPad

**Reported bugs**

- Widget shows up blank
- Numerical display is cut off
- Significant delay between key presses and display update

**Requested features**

- Add landscape mode support
- Improve widget responsiveness
- Increase bracket functionality


## Frequently asked questions

### Is RePNCalc free?

RePNCalc is free to download, with in-app purchases available.

### Is Calculator 17 free?

Calculator 17 is free to download, with no in-app purchases.

### Which has better reviews, RePNCalc or Calculator 17?

RePNCalc is rated higher. RePNCalc averages 5.0 out of 5 from 2 ratings, while Calculator 17 averages 4.6 from 990 ratings.

### Do RePNCalc or Calculator 17 have ads?

Neither RePNCalc nor Calculator 17 shows ads.

### Which is updated more often, RePNCalc or Calculator 17?

RePNCalc ships an update every 9 months, and Calculator 17 every 4 days. Most recently, RePNCalc was updated on November 1, 2026 and Calculator 17 on November 7, 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.*