# Stone Echo vs SL Air

The clearest difference is rating: SL Air at 5.0 against Stone Echo's 2.8. SL Air also leads on update cadence (weekly vs every 38 months). Stone Echo's advantage is price ($2.99 vs $6.99) and ratings volume (4 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

Stone Echo costs $2.99 and SL Air $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SL Air holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Stone Echo ships an update every 38 months, SL Air weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Stone Echo | SL Air |
| --- | --- | --- |
| Price | **$2.99** | $6.99 |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/stone-echo/id1354390681/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sl-air/id6797349220/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 9 MB | 15 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### Stone Echo

[App page](https://appshunter.io/ios/app/stone-echo/id1354390681)

This app creates a unique echo effect with adjustable frequency modulation, inspired by Mayan pyramid acoustics. It offers musical and experimental soundscapes, functioning as a standalone application or an AUV3 plugin.

**Highlights:** Frequency changing echo effect, Phase modulated frequency, Standalone app and AUV3 plugin, Adjustable time, feedback, and level, UFO mode for experimental sounds

**Features:** Vision Pro support

**In-app purchases:** none


### SL Air

[App page](https://appshunter.io/ios/app/sl-air/id6797349220)

Enhance your audio with this AUv3 effect, designed to add brightness, presence, and stereo width. Achieve a polished top-end for vocals, drums, samples, and full mixes with intuitive controls and a motion display.

**Highlights:** Controlled brightness (Air & Lift), Smoother high-frequency detail (Silk), Stereo expansion (Wide), Polished finish (Glow), Audio-reactive motion display, Factory and user presets, AUv3 support

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

**In-app purchases:** none


## Frequently asked questions

### Is Stone Echo free?

Stone Echo costs $2.99, with no in-app purchases.

### Is SL Air free?

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

### Which has better reviews, Stone Echo or SL Air?

SL Air is rated higher. Stone Echo averages 2.8 out of 5 from 4 ratings, while SL Air averages 5.0 from 1 ratings.

### Do Stone Echo or SL Air have ads?

Neither Stone Echo nor SL Air shows ads.

### Which is updated more often, Stone Echo or SL Air?

Stone Echo ships an update every 38 months, and SL Air weekly. Most recently, Stone Echo was updated on October 24, 2026 and SL Air on October 25, 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.*