# Stone Echo vs AU Studio

The clearest difference is rating: AU Studio at 4.5 against Stone Echo's 2.8. AU Studio also leads on update cadence (monthly vs every 38 months) and review sentiment (67% vs 50%). Stone Echo's advantage is price ($2.99 vs $9.99) and iOS requirement (10.0 vs 17.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Stone Echo costs $2.99 and AU Studio $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AU Studio holds the better App Store score, 4.5 against 2.8. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews point the same way: 50% of Stone Echo's written reviews are positive against 67% of AU Studio's.

Stone Echo ships an update every 38 months, AU Studio monthly. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Stone Echo | AU Studio |
| --- | --- | --- |
| Price | **$2.99** | $9.99 |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/stone-echo/id1354390681/reviews) | **[4.5 (4 ratings)](https://appshunter.io/ios/app/au-studio/id6763809742/reviews)** |
| Number of ratings | 4 | 4 |
| Positive reviews | 50.0% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 9 MB | 7 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Christian Thompson](https://appshunter.io/developer/1511795684) |

## 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


### AU Studio

[App page](https://appshunter.io/ios/app/au-studio/id6763809742)

This app acts as a dedicated host for Audio Unit extensions, allowing musicians and developers to inspect, audition, and test installed audio plugins. It provides detailed information about each unit's capabilities and behavior without requiring a full digital audio workstation.

**Highlights:** Scan and catalog installed Audio Units, Filter plugins by developer, type, and status, Load AUv3 interfaces or use detailed inspector, Inspect registry identity, MIDI support, and parameters, Route CoreMIDI sources and audition audio effects, Monitor runtime CPU and memory usage, Built-in manual for guidance

**In-app purchases:** none


## Frequently asked questions

### Is Stone Echo free?

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

### Is AU Studio free?

AU Studio costs $9.99, with no in-app purchases.

### Which has better reviews, Stone Echo or AU Studio?

AU Studio is rated higher. Stone Echo averages 2.8 out of 5 from 4 ratings, while AU Studio averages 4.5 from 4 ratings.

### Do Stone Echo or AU Studio have ads?

Neither Stone Echo nor AU Studio shows ads.

### Which is updated more often, Stone Echo or AU Studio?

Stone Echo ships an update every 38 months, and AU Studio monthly. Most recently, Stone Echo was updated on November 2, 2026 and AU Studio on November 5, 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.*