# ThetaCalc vs XLII

The clearest difference is update cadence: ThetaCalc at every 3 months against XLII's every 9 months. On price, ads, in-app purchases and device support there is nothing between them.

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

ThetaCalc ships an update every 3 months, XLII every 9 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | ThetaCalc | XLII |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | Free | — |
| Size | 1 MB | 15 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [telethon k.k.](https://appshunter.io/developer/699508003) |

## 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


### XLII

[App page](https://appshunter.io/ios/app/xlii/id1611293280)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ThetaCalc free?

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

### Is XLII free?

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

### Do ThetaCalc or XLII have ads?

Neither ThetaCalc nor XLII shows ads.

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

ThetaCalc ships an update every 3 months, and XLII every 9 months. Most recently, ThetaCalc was updated on November 3, 2026 and XLII on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*