# RST Scope vs trx

The clearest difference is ads: trx at none against RST Scope's shown. trx also leads on iOS requirement (13.0 vs 15.6). RST Scope's advantage is update cadence (every 3 days vs every 23 months). On price, 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.

RST Scope ships an update every 3 days, trx every 23 months. The most recent releases landed on August 22, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | RST Scope | trx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rst-scope/id1550582276/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 23 months |
| Monetization | Ad-supported | — |
| Size | 5 MB | 20 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [micro systems](https://appshunter.io/developer/1023315804) |

## What reviewers say

### RST Scope

[App page](https://appshunter.io/ios/app/rst-scope/id1550582276)

This utility app provides spectrum scope and waterfall displays for amateur radio operators. It enhances radios lacking these features by analyzing microphone input, allowing for clear distinction of Morse code and detailed audio frequency visualization.

**Highlights:** Spectrum scope and waterfall display, Morse code distinction via FFT, Adjustable waterfall speed, Adjustable audio input level, Switchable display band (wide/narrow), Display pause function, Recording and playback of input sound

**In-app purchases:** none


### trx

[App page](https://appshunter.io/ios/app/trx-control/id6478390481)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RST Scope free?

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

### Is trx free?

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

### Do RST Scope or trx have ads?

RST Scope shows ads; trx does not.

### Which is updated more often, RST Scope or trx?

RST Scope ships an update every 3 days, and trx every 23 months. Most recently, RST Scope was updated on August 22, 2026 and trx on September 7, 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.*