# ThetaCalc vs bcRPN

The clearest difference is rating: bcRPN at 4.8 against ThetaCalc's 4.3. bcRPN also leads on iOS requirement (15.0 vs 17.6). ThetaCalc's advantage is update cadence (every 3 months vs every 22 months) and review sentiment (100% vs 80%). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

bcRPN holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews complicate that: 100% of ThetaCalc's written reviews are positive against 80% of bcRPN's, so the app with the better star average is not the one people write more warmly about.

ThetaCalc ships an update every 3 months, bcRPN every 22 months. The most recent releases landed on June 1, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | ThetaCalc | bcRPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/bcrpn/id1614744829/reviews)** |
| Number of ratings | 4 | 4 |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 22 months |
| Monetization | Free | Free |
| Size | 1 MB | 0 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [Paul Wilkins](https://appshunter.io/developer/1614739840) |

## 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


### bcRPN

[App page](https://appshunter.io/ios/app/bcrpn/id1614744829)

This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.

**Highlights:** Reverse Polish Notation (RPN) input, Complex number calculations, Extended precision math, Unlimited stack depth, Undo functionality (up to 10 operations)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ThetaCalc free?

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

### Is bcRPN free?

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

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

bcRPN is rated higher. ThetaCalc averages 4.3 out of 5 from 4 ratings, while bcRPN averages 4.8 from 4 ratings.

### Do ThetaCalc or bcRPN have ads?

Neither ThetaCalc nor bcRPN shows ads.

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

ThetaCalc ships an update every 3 months, and bcRPN every 22 months. Most recently, ThetaCalc was updated on June 1, 2026 and bcRPN on September 19, 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.*