# User Scale vs AU Studio

The clearest difference is review sentiment: User Scale at 100% against AU Studio's 50%. User Scale also leads on price (Free vs $9.99) and iOS requirement (8.1 vs 17.0). AU Studio's advantage is rating (4.5 vs 3.5) and update cadence (monthly vs every 13 months). On ratings volume, ads and in-app purchases there is nothing between them.

User Scale is free to download; AU Studio costs $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 3.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews complicate that: 100% of User Scale's written reviews are positive against 50% of AU Studio's, so the app with the better star average is not the one people write more warmly about.

User Scale ships an update every 13 months, AU Studio monthly. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | User Scale | AU Studio |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/user-scale/id579231060/reviews) | **[4.5 (4 ratings)](https://appshunter.io/ios/app/au-studio/id6763809742/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 7 MB |
| Requires iOS | **8.1** | 17.0 |
| Devices | iPad | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Roland Corporation](https://appshunter.io/developer/387333694) | [Christian Thompson](https://appshunter.io/developer/1511795684) |

## What reviewers say

### User Scale

[App page](https://appshunter.io/ios/app/user-scale/id579231060)

This iPad application allows musicians to control the tuning scale of their Roland instruments. It enables real-time adjustments to key tunings, applying consistent values across notes of the same name during performances.

**Highlights:** Control tuning scale with iPad, Change instrument key tunings, Apply consistent tuning values, Real-time performance control

**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 User Scale free?

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

### Is AU Studio free?

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

### Which has better reviews, User Scale or AU Studio?

AU Studio is rated higher. User Scale averages 3.5 out of 5 from 2 ratings, while AU Studio averages 4.5 from 4 ratings.

### Do User Scale or AU Studio have ads?

Neither User Scale nor AU Studio shows ads.

### Which is updated more often, User Scale or AU Studio?

User Scale ships an update every 13 months, and AU Studio monthly. Most recently, User Scale was updated on September 30, 2026 and AU Studio on October 1, 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.*