# MUUR vs The Keystone

The clearest difference is price: MUUR at $7.99 against The Keystone's $19.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

MUUR costs $7.99 and The Keystone $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | MUUR | The Keystone |
| --- | --- | --- |
| Price | **$7.99** | $19.99 |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/muur/id6819803597/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Monetization | Paid | — |
| Size | 18 MB | 42 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Christian Alvarez](https://appshunter.io/developer/6814287010) | [artistpro, LLC](https://appshunter.io/developer/1578409515) |

## What reviewers say

### MUUR

[App page](https://appshunter.io/ios/app/muur/id6819803597)

This audio effect plugin shapes impact, weight, and character for music production. It offers advanced controls for transients, density, and spatial effects, with multiple processing modes and extensive preset management. Audio processing is handled locally within your compatible DAW or AUv3 host.

**Highlights:** Shape transients and density, Add color with HEAT and CRUSH, Three-band shaping with dynamic processing, Low-frequency character control, Pitch, frequency shifting, and ring modulation, Six spatial engines, 50 factory presets and 50 user slots

**In-app purchases:** none


### The Keystone

[App page](https://appshunter.io/ios/app/the-keystone/id6821493009)

**In-app purchases:** none


## Frequently asked questions

### Is MUUR free?

MUUR costs $7.99, with no in-app purchases.

### Is The Keystone free?

The Keystone costs $19.99, with no in-app purchases.

### Do MUUR or The Keystone have ads?

Neither MUUR nor The Keystone 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.*