# Stone Echo vs pOus

The clearest difference is rating: pOus at 5.0 against Stone Echo's 2.8. pOus also leads on update cadence (every 4 months vs every 38 months). Stone Echo's advantage is ratings volume (4 vs 1) and iOS requirement (10.0 vs 12.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

pOus 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, pOus every 4 months. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Stone Echo | pOus |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/stone-echo/id1354390681/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pous/id6748279554/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 | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 9 MB | 15 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Satoshi Kajii](https://appshunter.io/developer/1777441634) |

## 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


### pOus

[App page](https://appshunter.io/ios/app/pous/id6748279554)

This app emulates analog drum machine bass drums with adjustable tuning and decay. It offers MIDI OUT functionality for envelope follower data and a scale mode for playing musical scales. Designed for musicians using AUv3 hosts.

**Highlights:** BassDrum emulation, Adjustable tune and decay, MIDI OUT envelope follower, Scale mode for musical notes, AUv3 instrument, MIDI CC routing

**In-app purchases:** none


## Frequently asked questions

### Is Stone Echo free?

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

### Is pOus free?

pOus costs $2.99, with no in-app purchases.

### Which has better reviews, Stone Echo or pOus?

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

### Do Stone Echo or pOus have ads?

Neither Stone Echo nor pOus shows ads.

### Which is updated more often, Stone Echo or pOus?

Stone Echo ships an update every 38 months, and pOus every 4 months. Most recently, Stone Echo was updated on November 11, 2026 and pOus on October 30, 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.*