# Complex RPN Calculator vs DigiTwinClient

The clearest difference is rating: DigiTwinClient at 5.0 against Complex RPN Calculator's 3.8. DigiTwinClient also leads on update cadence (every 6 weeks vs every 5 months). Complex RPN Calculator's advantage is ratings volume (22 vs 4) and iOS requirement (16.4 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

DigiTwinClient holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 22 ratings behind it against 4, so its average is the more settled of the two.

Complex RPN Calculator ships an update every 5 months, DigiTwinClient every 6 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | DigiTwinClient |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (22 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/digitwinclient/id6738113269/reviews)** |
| Number of ratings | **22** | 4 |
| Positive reviews | 51.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 82 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Grid Raster Inc.](https://appshunter.io/developer/1729109000) |

## 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)


### DigiTwinClient

[App page](https://appshunter.io/ios/app/digitwinclient/id6738113269)

Create high-quality 3D digital twins of objects and scenes using your LiDAR-enabled iOS device. Transfer capture data to a companion Mac app for precise processing and export models in USDZ or OBJ formats for various industrial and creative applications.

**Highlights:** LiDAR 3D scanning, Digital twin generation, Companion Mac application, USDZ/OBJ export, Visual inspections, Design review

**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 DigiTwinClient free?

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

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

DigiTwinClient is rated higher. Complex RPN Calculator averages 3.8 out of 5 from 22 ratings, while DigiTwinClient averages 5.0 from 4 ratings.

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

Neither Complex RPN Calculator nor DigiTwinClient shows ads.

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

Complex RPN Calculator ships an update every 5 months, and DigiTwinClient every 6 weeks. Most recently, Complex RPN Calculator was updated on October 14, 2026 and DigiTwinClient on October 11, 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.*