# Complex RPN Calculator vs Mathgra Math Grapher

The clearest difference is ads: Complex RPN Calculator at none against Mathgra Math Grapher's shown. Complex RPN Calculator also leads on iOS requirement (16.4 vs 18.0). Mathgra Math Grapher's advantage is update cadence (daily vs every 5 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Complex RPN Calculator ships an update every 5 months, Mathgra Math Grapher daily. The most recent releases landed on August 23, 2026 and June 3, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Mathgra Math Grapher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (22 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 51.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Daily** |
| Monetization | Free | — |
| Size | 1 MB | 8 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Hideyuki Inada](https://appshunter.io/developer/926079378) |

## 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)


### Mathgra Math Grapher

[App page](https://appshunter.io/ios/app/mathgra-math-grapher/id6746895070)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Complex RPN Calculator free?

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

### Is Mathgra Math Grapher free?

Mathgra Math Grapher is free to download, with no in-app purchases.

### Do Complex RPN Calculator or Mathgra Math Grapher have ads?

Mathgra Math Grapher shows ads; Complex RPN Calculator does not.

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

Complex RPN Calculator ships an update every 5 months, and Mathgra Math Grapher daily. Most recently, Complex RPN Calculator was updated on August 23, 2026 and Mathgra Math Grapher on June 3, 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.*