# ThetaCalc vs SwiftRPN

The clearest difference is rating: SwiftRPN at 5.0 against ThetaCalc's 4.3. ThetaCalc's advantage is update cadence (every 3 months vs every 14 months) and ratings volume (4 vs 1). 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.

SwiftRPN holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

ThetaCalc ships an update every 3 months, SwiftRPN every 14 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | ThetaCalc | SwiftRPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swiftrpn/id6470951024/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 14 months |
| Monetization | Free | Free |
| Size | 1 MB | 3 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [Patrick Gelvin](https://appshunter.io/developer/1573354051) |

## What reviewers say

### ThetaCalc

[App page](https://appshunter.io/ios/app/thetacalc/id1521614636)

This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.

**Highlights:** Reverse Polish Notation (RPN) calculator, User-programmable functions, JavaScript equation support, Extensible functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### SwiftRPN

[App page](https://appshunter.io/ios/app/swiftrpn/id6470951024)

This utility app provides a powerful Reverse Polish Notation (RPN) calculator with advanced features. It supports scalar types, vectors, and matrices, along with extensive built-in operators and unit conversions. Easily switch between number bases and visualize results.

**Highlights:** RPN stack for efficient calculations, Support for scalar, vector, and matrix types, 84 built-in operators with documentation, 74 built-in units for conversion, Multiple number base input and output (binary, octal, decimal, hex), BigInt support for integer calculations

**In-app purchases:** none


## Frequently asked questions

### Is ThetaCalc free?

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

### Is SwiftRPN free?

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

### Which has better reviews, ThetaCalc or SwiftRPN?

SwiftRPN is rated higher. ThetaCalc averages 4.3 out of 5 from 4 ratings, while SwiftRPN averages 5.0 from 1 ratings.

### Do ThetaCalc or SwiftRPN have ads?

Neither ThetaCalc nor SwiftRPN shows ads.

### Which is updated more often, ThetaCalc or SwiftRPN?

ThetaCalc ships an update every 3 months, and SwiftRPN every 14 months. Most recently, ThetaCalc was updated on November 3, 2026 and SwiftRPN on November 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.*