# Complex RPN Calculator vs Calculator #

The clearest difference is rating: Calculator # at 4.6 against Complex RPN Calculator's 3.8. Calculator # also leads on ratings volume (36K vs 22) and update cadence (every 2 months vs every 5 months). Complex RPN Calculator's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Calculator # sells 6 in-app purchases, starting at $1.49 per month. Complex RPN Calculator asks for nothing beyond the download.

Calculator # holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 60% of Calculator #'s.

Complex RPN Calculator ships an update every 5 months, Calculator # every 2 months. The most recent releases landed on August 23, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Calculator # |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (22 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[4.6 (36K ratings)](https://appshunter.io/ios/app/calculator/id458535080/reviews)** |
| Number of ratings | 22 | **36K** |
| Positive reviews | 51.7% of reviews | **60.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 57 MB |
| Requires iOS | 16.4 | **12.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Incpt.Mobis](https://appshunter.io/developer/445261166) |

## What reviewers say

### Complex RPN Calculator

[App page](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330)

This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.

**Highlights:** Complex number support, Four-level stack, Polar and rectangular formats, State persistence, 10 memory locations, Scientific calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ Great RPN functionality
- ✨ Complex number support
- 🆓 Free to use
- 🚫 No ads or in-app purchases
- 💻 Works on macOS

**What reviewers complain about**

- 🎨 SwiftUI design is ugly
- 🐌 Slow keyboard response
- 🖱️ Clunky operation
- 📉 Complex number operations limited
- ⚠️ Broken on newer iOS versions (historically)

**Reported bugs**

- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)

**Requested features**

- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)


### 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


## Frequently asked questions

### Is Complex RPN Calculator free?

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

### Is Calculator # free?

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

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

Calculator # is rated higher. Complex RPN Calculator averages 3.8 out of 5 from 22 ratings, while Calculator # averages 4.6 from 36K ratings.

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

Calculator # shows ads; Complex RPN Calculator does not.

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

Complex RPN Calculator ships an update every 5 months, and Calculator # every 2 months. Most recently, Complex RPN Calculator was updated on August 23, 2026 and Calculator # on September 24, 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.*