# Calculator # vs Calculator RPN

The clearest difference is price: Calculator # at Free against Calculator RPN's $4.99. Calculator # also leads on ratings volume (36K vs 48) and iOS requirement (12.1 vs 14.0). Calculator RPN's advantage is in-app purchases (none vs 6) and ads (none vs shown). On rating and review sentiment there is nothing between them.

Calculator # is free to download; Calculator RPN costs $4.99 up front. Calculator # sells 6 in-app purchases, starting at $1.49 per month. Calculator RPN asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Calculator # against 4.7 for Calculator RPN. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 48, so its average is the more settled of the two. Written reviews split almost evenly too, at 60% and 60% positive.

Calculator # ships an update every 2 months, Calculator RPN every 3 weeks. The most recent releases landed on November 8, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Calculator # | Calculator RPN |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [4.6 (36K ratings)](https://appshunter.io/ios/app/calculator/id458535080/reviews) | **[4.7 (48 ratings)](https://appshunter.io/ios/app/calculator-rpn/id568690457/reviews)** |
| Number of ratings | **36K** | 48 |
| Positive reviews | 59.5% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 57 MB | 16 MB |
| Requires iOS | **12.1** | 14.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Benjamin Pisano](https://appshunter.io/developer/1232617402) |

## What reviewers say

### Calculator #

[App page](https://appshunter.io/ios/app/calculator/id458535080)

This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.

**Highlights:** Math Photos Solver, Handwriting Recognition, AI Math Problem Solver, Mathematical Display, Equation Solvers, 2D Graphing, Algebraic Functions

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Upgrade 1 Month | $1.49 | per month |
| PRO Upgrade 3 Months | $2.99 | per 3 months |
| PRO + Recognition 1 Month | $4.99 | per month |
| PRO + Recognition 3 Months | $11.99 | per 3 months |
| 250 AI Recognition & Queries | $0.99 | one-time |
| 600 AI Recognition & Queries | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Powerful functionality
- 💡 Helpful for math classes
- ⭐ Great for students
- 👌 Works like a real calculator

**What reviewers complain about**

- 🔍 Confusing interface after update
- 📢 Too many intrusive ads
- 💰 Paywall for advanced features
- 🐛 Incorrect calculations
- 🔇 Loud audio ads

**Reported bugs**

- Crashes when trying to use certain functions
- Handwriting recognition not working reliably
- Inability to input negative numbers

**Requested features**

- Add option to turn off animation
- Improve ad placement to avoid obstructing usage
- Provide more transparency on paid features


### Calculator RPN

[App page](https://appshunter.io/ios/app/calculator-rpn/id568690457)

This scientific calculator offers Reverse Polish Notation (RPN) for faster calculations. It includes 54 mathematical functions, coordinate conversions, and unit conversions, all within a simple interface.

**Highlights:** RPN calculation mode, 54 mathematical functions, Trigonometry (simple and hyperbolic), Coordinate and unit conversions, Degrees and radians support, Simple interface

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Calculator # free?

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

### Is Calculator RPN free?

Calculator RPN costs $4.99, with no in-app purchases.

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

Calculator RPN is rated higher. Calculator # averages 4.6 out of 5 from 36K ratings, while Calculator RPN averages 4.7 from 48 ratings.

### Do Calculator # or Calculator RPN have ads?

Calculator # shows ads; Calculator RPN does not.

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

Calculator # ships an update every 2 months, and Calculator RPN every 3 weeks. Most recently, Calculator # was updated on November 8, 2026 and Calculator RPN on November 1, 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.*