# Enigma Semi vs RST Scope

The clearest difference is in-app purchases: RST Scope at none against Enigma Semi's 12. RST Scope also leads on update cadence (every 3 days vs every 2 months). Enigma Semi's advantage is ads (none vs shown) and iOS requirement (9.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Enigma Semi sells 12 one-off in-app purchases. RST Scope asks for nothing beyond the download.

Enigma Semi ships an update every 2 months, RST Scope every 3 days. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Enigma Semi | RST Scope |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rst-scope/id1550582276/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | — | Ad-supported |
| Size | 4 MB | 5 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DILTS JAPAN, LIMITED LIABILITY CO.](https://appshunter.io/developer/780416956) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### Enigma Semi

[App page](https://appshunter.io/ios/app/enigma-semi-full-easy-mode/id1452553716)

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CYGNUS-X SE44J | $3.99 | one-time |
| GROM JC61 | $3.99 | one-time |
| GROM JC75 | $3.99 | one-time |
| MONKEY125 JB02 | $3.99 | one-time |
| Z125 Pro | $3.99 | one-time |
| SUPER CUB C125 JA58 | $3.99 | one-time |
| HUNTER CUB CT125 JA65 | $3.99 | one-time |
| DAX125 JB04/JB06 | $3.99 | one-time |
| GROM 8BJ-JC92 | $3.99 | one-time |
| CROSS CUB CC110 JA60 | $3.99 | one-time |
| GROM 2BJ-JC92 | $3.99 | one-time |
| MONKEY125 JB03/05 | $3.99 | one-time |


### 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


## Frequently asked questions

### Is Enigma Semi free?

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

### Is RST Scope free?

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

### Do Enigma Semi or RST Scope have ads?

RST Scope shows ads; Enigma Semi does not.

### Which is updated more often, Enigma Semi or RST Scope?

Enigma Semi ships an update every 2 months, and RST Scope every 3 days. Most recently, Enigma Semi was updated on October 26, 2026 and RST Scope on October 13, 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.*