# NF ACOUS vs MU

The clearest difference is update cadence: MU at every 3 days against NF ACOUS's every 8 days. MU also leads on iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NF ACOUS ships an update every 8 days, MU every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | NF ACOUS | MU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 3 days** |
| Size | 25 MB | 17 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Ningfan Acoustics Co., Ltd.](https://appshunter.io/developer/1875820174) | [浩明 甄](https://appshunter.io/developer/6779027894) |

## What reviewers say

### NF ACOUS

[App page](https://appshunter.io/ios/app/nf-acous/id6759710633)

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

**In-app purchases:** none


### MU

[App page](https://appshunter.io/ios/app/mu-22/id6786191145)

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

**In-app purchases:** none


## Frequently asked questions

### Is NF ACOUS free?

NF ACOUS is free to download, with no in-app purchases.

### Is MU free?

MU is free to download, with no in-app purchases.

### Do NF ACOUS or MU have ads?

Neither NF ACOUS nor MU shows ads.

### Which is updated more often, NF ACOUS or MU?

NF ACOUS ships an update every 8 days, and MU every 3 days. Most recently, NF ACOUS was updated on October 31, 2026 and MU on October 31, 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.*