RadauApp vs SL Echo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RadauApp
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.
- Plays Apple Music & MP3s
- Supports podcasts and web radio
- Simple, icon-based interface
- Parent mode for media management
- Childproof access lock
- Reuses old devices
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RadauApp – The eco-friendly alternative to kids’ music boxes #Works with iPhone 6s and newer Got an old iPhone lying around? Perfect! With RadauApp, you can turn it into a super simple music box for your little ones – packed with: • Apple Music & your own MP3s • Favorite podcasts • Kid-friendly web radio The interface is intentionally kept simple – no reading skills required. Big tiles, intuitive icons, no distractions. Just tap – and the music plays! Parent Mode included In the protected parent zone, you can: • Manage media (playlists, podcasts, radio stations) • Change cover artwork • Add or remove content All childproofed with a simple access lock. Why RadauApp? • Skip the expensive hardware (like the T-Box) • Reuse devices instead of throwing them away • Full control & privacy – no cloud required
SL Echo
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.
- 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
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SL Echo is a focused AUv3 delay effect designed for fast musical decisions on iPad. Move from a close vocal pocket to wide, evolving repeats without navigating complex pages. • Time and feedback for slapback or long trails • Tone shaping for darker or brighter repeats • Stereo width and ducking for a clear dry signal • Factory presets and local user presets • AUv3 support for compatible iPad music hosts Works as a standalone preview app and as an AUv3 effect in GarageBand, AUM, Cubasis, BeatMaker 3 and other compatible hosts.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RadauApp | SL Echo |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Becker | VIACHESLAV ZHILTSOV |
Customer experience
RadauApp
SL Echo
In-app purchases
RadauApp
No in-app purchases
SL Echo
No in-app purchases
