# RST Scope vs OnDuty App

The clearest difference is in-app purchases: RST Scope at none against OnDuty App's 2. OnDuty App's advantage is ads (none vs shown). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. OnDuty App sells 2 in-app purchases, starting at $2.99 per month. RST Scope asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for RST Scope against 5.0 for OnDuty App. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RST Scope | OnDuty App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rst-scope/id1550582276/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/onduty-app/id6786702167/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 5 MB | 20 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [Dan Jones](https://appshunter.io/developer/6786702169) |

## 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


### OnDuty App

[App page](https://appshunter.io/ios/app/onduty-app/id6786702167)

This AI-powered field companion assists paramedics and EMTs with clinical decision support and shift management. It offers a streamlined alternative to traditional binders and PDFs, designed for high-stress emergency situations.

**Highlights:** AI-powered clinical decision support, Shift schedule management, Streamlined workflow, Pocket-sized tool, Designed by veteran paramedic

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $2.99 | per month |
| Yearly Subscription | $29.99 | per year |


## Frequently asked questions

### Is RST Scope free?

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

### Is OnDuty App free?

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

### Which has better reviews, RST Scope or OnDuty App?

RST Scope and OnDuty App are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do RST Scope or OnDuty App have ads?

RST Scope shows ads; OnDuty App does not.

### Which is updated more often, RST Scope or OnDuty App?

RST Scope ships an update every 3 days, and OnDuty App every 3 days. Most recently, RST Scope was updated on October 13, 2026 and OnDuty App on October 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.*