# RF vs RST Scope

The clearest difference is price: RST Scope at Free against RF's $0.99. RST Scope also leads on update cadence (every 3 days vs every 8 months). RF's advantage is ads (none vs shown) and iOS requirement (13.0 vs 15.6). On in-app purchases and device support there is nothing between them.

RST Scope is free to download; RF costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RF ships an update every 8 months, RST Scope every 3 days. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | RF | RST Scope |
| --- | --- | --- |
| Price | $0.99 | **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 | **No** | Yes |
| Update frequency | Every 8 months | **Every 3 days** |
| Monetization | — | Ad-supported |
| Size | 6 MB | 5 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Julien Geissbuehler](https://appshunter.io/developer/1762554076) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### RF

[App page](https://appshunter.io/ios/app/rf-calc/id647697327)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 RF free?

RF costs $0.99, with no in-app purchases.

### Is RST Scope free?

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

### Do RF or RST Scope have ads?

RST Scope shows ads; RF does not.

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

RF ships an update every 8 months, and RST Scope every 3 days. Most recently, RF was updated on October 7, 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.*