# Complex RPN Calculator vs Projectile Motion Calc

The clearest difference is review sentiment: Complex RPN Calculator at 52% against Projectile Motion Calc's 0%. Complex RPN Calculator also leads on price (Free vs $2.99) and update cadence (every 5 months vs every 29 months). Projectile Motion Calc's advantage is iOS requirement (13 vs 16.4). On ads, in-app purchases and device support there is nothing between them.

Complex RPN Calculator is free to download; Projectile Motion Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Complex RPN Calculator holds the better App Store score, 3.9 against 3.7. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 3, 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 0% of Projectile Motion Calc's.

Complex RPN Calculator ships an update every 5 months, Projectile Motion Calc every 29 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Projectile Motion Calc |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/projectile-motion-calc/id1397143056/reviews) |
| Number of ratings | **24** | 3 |
| Positive reviews | **51.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 29 months |
| Monetization | **Free** | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | 16.4 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Nitrio](https://appshunter.io/developer/321121189) |

## 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)


### Projectile Motion Calc

[App page](https://appshunter.io/ios/app/projectile-motion-calc/id1397143056)

This physics calculator quickly determines key projectile motion parameters like horizontal and vertical velocity, time of flight, range, and maximum height. It supports various units and offers precise calculations up to 16 decimal places.

**Highlights:** Instant calculation of projectile motion parameters, Copyable results to other apps, Includes reference formulas, Supports up to 16 decimal places, Supports various input units, Lightweight and optimized for everyday use

**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 Projectile Motion Calc free?

Projectile Motion Calc costs $2.99, with no in-app purchases.

### Which has better reviews, Complex RPN Calculator or Projectile Motion Calc?

Complex RPN Calculator is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while Projectile Motion Calc averages 3.7 from 3 ratings.

### Do Complex RPN Calculator or Projectile Motion Calc have ads?

Neither Complex RPN Calculator nor Projectile Motion Calc shows ads.

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

Complex RPN Calculator ships an update every 5 months, and Projectile Motion Calc every 29 months. Most recently, Complex RPN Calculator was updated on October 21, 2026 and Projectile Motion Calc on October 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.*