# Stone Echo vs P252 MDN Diode

The clearest difference is price: Stone Echo at $2.99 against P252 MDN Diode's $19.99. Stone Echo also leads on iOS requirement (10.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Stone Echo costs $2.99 and P252 MDN Diode $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Stone Echo | P252 MDN Diode |
| --- | --- | --- |
| Price | **$2.99** | $19.99 |
| Rating | **[2.8 (4 ratings)](https://appshunter.io/ios/app/stone-echo/id1354390681/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | — |
| Monetization | Paid | — |
| Size | 9 MB | 29 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) | [Pulsar Modular](https://appshunter.io/developer/6793457903) |

## 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


### P252 MDN Diode

[App page](https://appshunter.io/ios/app/p252-mdn-diode/id6804660463)

**In-app purchases:** none


## Frequently asked questions

### Is Stone Echo free?

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

### Is P252 MDN Diode free?

P252 MDN Diode costs $19.99, with no in-app purchases.

### Do Stone Echo or P252 MDN Diode have ads?

Neither Stone Echo nor P252 MDN Diode shows ads.

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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.*