# Complex RPN Calculator vs OmniCounter

The clearest difference is review sentiment: OmniCounter at 100% against Complex RPN Calculator's 52%. OmniCounter also leads on rating (5.0 vs 3.8) and iOS requirement (13.0 vs 16.4). Complex RPN Calculator's advantage is in-app purchases (none vs 10) and ratings volume (22 vs 4). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. OmniCounter sells 10 one-off in-app purchases. Complex RPN Calculator asks for nothing beyond the download.

OmniCounter 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. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 100% of OmniCounter's.

Complex RPN Calculator ships an update every 5 months, OmniCounter every 4 months. The most recent releases landed on August 23, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | OmniCounter |
| --- | --- | --- |
| 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/omnicounter/id1569846314/reviews)** |
| Number of ratings | **22** | 4 |
| Positive reviews | 51.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 1 MB | 14 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [留传 于](https://appshunter.io/developer/1569844705) |

## 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)


### OmniCounter

[App page](https://appshunter.io/ios/app/omnicounter/id1569846314)

This app is a comprehensive calculator with support for basic, scientific, and advanced mathematical functions. It features a customizable keyboard, multiple input bases, and expression beautification. Enjoy a powerful, ad-free calculation experience.

**Highlights:** Supports over a dozen computing categories, Customizable keyboard with auto-completion, Multiple input bases (binary, octal, decimal, hex), Beautified input expressions, Optional historical features, Copy inputs and outputs

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Datetime | $0.99 | one-time |
| Calculus | $2.99 | one-time |
| Combinatorics | $2.99 | one-time |
| Economics | $2.99 | one-time |
| Geometry | $2.99 | one-time |
| Matrix & Vector | $2.99 | one-time |
| SpecialFunction | $2.99 | one-time |
| NumberTheory | $2.99 | one-time |
| Statistics | $2.99 | one-time |
| Trigonometry | $2.99 | one-time |


## Frequently asked questions

### Is Complex RPN Calculator free?

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

### Is OmniCounter free?

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

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

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

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

Neither Complex RPN Calculator nor OmniCounter shows ads.

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

Complex RPN Calculator ships an update every 5 months, and OmniCounter every 4 months. Most recently, Complex RPN Calculator was updated on August 23, 2026 and OmniCounter on June 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.*