# Complex RPN Calculator vs Calculator₊

The clearest difference is rating: Calculator₊ at 4.7 against Complex RPN Calculator's 3.9. Calculator₊ also leads on update cadence (every 3 weeks vs every 5 months) and ratings volume (1.7M vs 24). Complex RPN Calculator's advantage is in-app purchases (none vs 13) and ads (none vs shown). On price and iOS requirement there is nothing between them.

Both are free to download. Calculator₊ sells 12 in-app purchases, starting at $0.99 per month. Complex RPN Calculator asks for nothing beyond the download.

Calculator₊ holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: Calculator₊ has 1.7M ratings behind it against 24, 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 63% of Calculator₊'s.

Complex RPN Calculator ships an update every 5 months, Calculator₊ every 3 weeks. The most recent releases landed on October 21, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Calculator₊ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[4.7 (1.7M ratings)](https://appshunter.io/ios/app/calculator/id398129933/reviews)** |
| Number of ratings | 24 | **1.7M** |
| Positive reviews | 51.7% of reviews | **63.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#92** |
| Size | 1 MB | 237 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Impala Studios](https://appshunter.io/developer/1063279743) |

## 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/id398129933)

**Currently charting:** #92 Top Grossing · Utilities (US App Store)

This app offers a comprehensive suite of calculation tools, including basic, scientific, and unit conversion functions. It features an AI-powered math solver that can solve problems from photos and a dedicated math notes section for jotting down equations and diagrams. Accessibility options like dynamic text size and VoiceOver support are also included.

**Highlights:** Basic and scientific calculations, Unit and currency converter, AI-powered math solver with photo recognition, Math notes with instant solutions, Calculation history log, Accessibility features

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Member Special Offer | $0.99 | per month |
| Monthly Premium Member | $0.99 | per month |
| 1 Month Premium Access | $1.49 | per month |
| Unlimited Math Calculations | $3.99 | per 6 months |
| Half-Yearly Premium Member | $3.99 | per 6 months |
| Calculate Faster, AI, & No Ads | $4.99 | per 7 days |
| 1 Year Ad-Free | $5.99 | per year |
| Calculate Faster, AI, & No Ads | $5.99 | per 7 days |
| 1 Month Premium Trial | $5.99 | per 7 days |
| Math Solver/Full Access/No Ads | $5.99 | per 7 days |
| 6 Months Premium Access | $8.99 | per 6 months |
| Smart Currency & Fraction Calc | $14.99 | per year |

**What reviewers like**

- 💻 Useful calculator features
- 🎨 Customizable backgrounds and themes
- 📚 Helpful history tracking

**What reviewers complain about**

- 📺 Intrusive full-screen ads
- 💰 Expensive subscription model
- 🔍 Ads blocking calculator functionality

**Reported bugs**

- Incorrect calculation results for certain functions
- Inability to delete last entered digit without clearing entire calculation

**Requested features**

- Ability to delete individual calculation history entries
- More free advanced calculator features (fractions, currency, etc.)
- Improved ad placement that doesn't interfere with usage


## 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 3.9 out of 5 from 24 ratings, while Calculator₊ averages 4.7 from 1.7M 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 3 weeks. Most recently, Complex RPN Calculator was updated on October 21, 2026 and Calculator₊ on November 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.*