# RadauApp vs SL Echo

The clearest difference is price: RadauApp at Free against SL Echo's $6.99. RadauApp also leads on update cadence (every 3 days vs weekly). On rating, ratings volume, ads and in-app purchases there is nothing between them.

RadauApp is free to download; SL Echo costs $6.99 up front. 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 RadauApp against 5.0 for SL Echo. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

RadauApp ships an update every 3 days, SL Echo weekly. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | RadauApp | SL Echo |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/radauapp/id6745492017/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sl-echo/id6797348934/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | **Free** | Paid |
| Size | 2 MB | 19 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jens Becker](https://appshunter.io/developer/1812524170) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### RadauApp

[App page](https://appshunter.io/ios/app/radauapp/id6745492017)

Transform an old iPhone into a child-friendly music player. It supports Apple Music, MP3s, podcasts, and web radio with a simple, intuitive interface. A parent mode allows for easy media management and content control.

**Highlights:** Plays Apple Music & MP3s, Supports podcasts and web radio, Simple, icon-based interface, Parent mode for media management, Childproof access lock, Reuses old devices

**Features:** macOS Compatibility

**In-app purchases:** none


### SL Echo

[App page](https://appshunter.io/ios/app/sl-echo/id6797348934)

This audio effect app provides animated delay and space for musical decisions on iPad. Easily adjust time, feedback, and tone for various repeat styles, while maintaining a clear dry signal with stereo width and ducking. It supports AUv3 integration with popular music hosts.

**Highlights:** Animated delay and space effects, Adjustable time and feedback, Tone shaping controls, Stereo width and ducking, AUv3 support, Standalone preview mode, Factory and user presets

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is RadauApp free?

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

### Is SL Echo free?

SL Echo costs $6.99, with no in-app purchases.

### Which has better reviews, RadauApp or SL Echo?

RadauApp and SL Echo are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do RadauApp or SL Echo have ads?

Neither RadauApp nor SL Echo shows ads.

### Which is updated more often, RadauApp or SL Echo?

RadauApp ships an update every 3 days, and SL Echo weekly. Most recently, RadauApp was updated on November 5, 2026 and SL Echo on November 10, 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.*