# ThetaCalc vs StreamMateX

The clearest difference is in-app purchases: ThetaCalc at none against StreamMateX's 1. ThetaCalc also leads on ads (none vs shown). StreamMateX's advantage is update cadence (every 9 days vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. StreamMateX sells 1 in-app purchase, starting at $1.99 per month. ThetaCalc asks for nothing beyond the download.

ThetaCalc ships an update every 3 months, StreamMateX every 9 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | ThetaCalc | StreamMateX |
| --- | --- | --- |
| 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** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 1 MB | 7 MB |
| Requires iOS | 17.6 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [中奇 任](https://appshunter.io/developer/1801344068) |

## 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


### StreamMateX

[App page](https://appshunter.io/ios/app/streammatex/id6745404700)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StreamMate  Premium | $1.99 | per month |


## Frequently asked questions

### Is ThetaCalc free?

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

### Is StreamMateX free?

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

### Do ThetaCalc or StreamMateX have ads?

StreamMateX shows ads; ThetaCalc does not.

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

ThetaCalc ships an update every 3 months, and StreamMateX every 9 days. Most recently, ThetaCalc was updated on November 3, 2026 and StreamMateX on November 8, 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.*