RST Scope vs Contacts Shuffle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RST Scope
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.
- 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
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This is an app for amateur radio operators with a narrow band of audio frequency, spectrum scope & waterfall display. You can get a rich display by microphone inputting the speaker output of a radio that does not have a spectrum scope or waterfall function. The FFT allows you to distinguish between the dot and dash of Morse code. [function] 1. Ability to change the speed of the waterfall 2. Ability to adjust the level of audio input 3. Function to switch the display band between wide and narrow 4. Display pause function (pause / cancel by touching the screen) 5. Function to switch the cross hatch ON / OFF by longTap 6. Frequency resolution is fixed at 40Hz. 7. Function to switch the USB/LSB by Left/Right Swipe 8.Recording/Playback function of Input Sound RST Scope(Free) https://www.youtube.com/watch?v=1s9RvOFp52g
Contacts Shuffle
This utility app helps you manage your extensive contact list by randomly selecting an entry. You can then choose to delete, modify, or directly contact the selected person.
- Random contact selection
- Contact deletion
- Contact modification
- Direct contact initiation
- Works with existing address book
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Is your Contacts address book so large that you don't know who to bring up? Then this app is for you. You press a button and a contact is randomly retrieved from your address book. You can then decide what you want to do with it. Either delete it, modify it, or contact that person.
Screenshots
Verdict
The clearest difference is ads: Contacts Shuffle at none against RST Scope's shown. Contacts Shuffle also leads on monetization model (free vs ad-supported). RST Scope's advantage is update cadence (every 3 days vs fortnightly). On price, rating, ratings volume and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for RST Scope against 5.0 for Contacts Shuffle. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
RST Scope ships an update every 3 days, Contacts Shuffle fortnightly. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.
| Parameter | RST Scope | Contacts Shuffle |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 days — better | Fortnightly |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, Mac — better |
| Requires iOS | 15.6 — better | 16.4 |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | koji kamogawa | Wayland Chin |
Customer experience
RST Scope
Contacts Shuffle
In-app purchases
RST Scope
No in-app purchases
Contacts Shuffle
No in-app purchases
Questions
Is RST Scope free?
Is Contacts Shuffle free?
Which has better reviews, RST Scope or Contacts Shuffle?
Do RST Scope or Contacts Shuffle have ads?
Which is updated more often, RST Scope or Contacts Shuffle?
Other comparisons
