# Music from CDSS Gems vs SL Echo

The clearest difference is price: Music from CDSS Gems at Free against SL Echo's $6.99. SL Echo's advantage is update cadence (weekly vs every 38 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

Music from CDSS Gems is free to download; SL Echo costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Music from CDSS Gems ships an update every 38 months, SL Echo weekly. The most recent releases landed on October 29, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Music from CDSS Gems | SL Echo |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sl-echo/id6797348934/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Weekly** |
| Monetization | — | Paid |
| Size | 26 MB | 19 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Transported Productions](https://appshunter.io/developer/391280629) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### Music from CDSS Gems

[App page](https://appshunter.io/ios/app/music-from-cdss-gems/id1017164251)

**Features:** Vision Pro support

**In-app purchases:** none


### SL Echo

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

This app provides an AUv3 delay effect for iPad, allowing musicians to quickly create a range of echo sounds from short slapbacks to long, evolving trails. It offers intuitive controls for time, feedback, tone, and stereo width, and works both standalone and within compatible music hosts.

**Highlights:** AUv3 delay effect, Intuitive controls for time and feedback, Tone shaping for repeats, Stereo width and ducking, Standalone preview and AUv3 integration, Factory and user presets

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

**In-app purchases:** none


## Frequently asked questions

### Is Music from CDSS Gems free?

Music from CDSS Gems is free to download, with no in-app purchases.

### Is SL Echo free?

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

### Do Music from CDSS Gems or SL Echo have ads?

Neither Music from CDSS Gems nor SL Echo shows ads.

### Which is updated more often, Music from CDSS Gems or SL Echo?

Music from CDSS Gems ships an update every 38 months, and SL Echo weekly. Most recently, Music from CDSS Gems was updated on October 29, 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.*