# KeyStage vs NuRack Auv3 FX Processor

The clearest difference is price: NuRack Auv3 FX Processor at $7.99 against KeyStage's $29.99. NuRack Auv3 FX Processor also leads on in-app purchases (none vs 7) and update cadence (every 3 weeks vs every 3 months). On rating, review sentiment, ratings volume and ads there is nothing between them.

KeyStage costs $29.99 and NuRack Auv3 FX Processor $7.99 up front. KeyStage sells 7 one-off in-app purchases. NuRack Auv3 FX Processor asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for KeyStage against 4.7 for NuRack Auv3 FX Processor. Both are backed by a comparable volume of ratings — 37 and 42 respectively. Written reviews are what separate them: 91% of KeyStage's written reviews are positive against 84% of NuRack Auv3 FX Processor's.

KeyStage ships an update every 3 months, NuRack Auv3 FX Processor every 3 weeks. The most recent releases landed on September 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | KeyStage | NuRack Auv3 FX Processor |
| --- | --- | --- |
| Price | $29.99 | **$7.99** |
| Rating | [4.7 (37 ratings)](https://appshunter.io/ios/app/keystage/id1406132634/reviews) | [4.7 (42 ratings)](https://appshunter.io/ios/app/nurack-auv3-fx-processor/id1520146960/reviews) |
| Number of ratings | 37 | **42** |
| Positive reviews | **91.0% of reviews** | 84.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#197** |
| Size | 61 MB | 26 MB |
| Requires iOS | 13.0 | 13 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ali Gokturk](https://appshunter.io/developer/1406132633) | [4Pockets.com](https://appshunter.io/developer/370131860) |

## What reviewers say

### KeyStage

[App page](https://appshunter.io/ios/app/keystage/id1406132634)

This app acts as a master controller, AUv3 host, and audio mixer for keyboard players. It allows simultaneous control of multiple hardware and software instruments via MIDI, with advanced mapping, scripting, and audio mixing capabilities.

**Highlights:** Connect multiple MIDI controllers to instruments, Load AUv3 instruments, effects, and MIDI processors, Create complex keyboard splits and layers, Advanced MIDI mapping and scripting, Audio mixer with volume and pan control, Play and automate audio files, View PDF and JPG files

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Instrument Units | Free | one-time |
| Effect Units | Free | one-time |
| Player, Input, and Mixer Units | Free | one-time |
| MIDI Units | Free | one-time |
| Small Tip | $0.99 | one-time |
| Medium Tip | $3.99 | one-time |
| Large Tip | $9.99 | one-time |


### NuRack Auv3 FX Processor

[App page](https://appshunter.io/ios/app/nurack-auv3-fx-processor/id1520146960)

**Currently charting:** #197 Top Paid · Music (US App Store)

Design custom audio and MIDI effects racks with over 80 building blocks. Route audio in series or parallel and create unique interfaces for your sound processing needs.

**Highlights:** Design custom effects racks, Over 80 audio and MIDI building blocks, Full routing control (series/parallel), Customizable interface builder, Seamless effect switching, 3 independent audio racks mode, Extensive automation options

**In-app purchases:** none


## Frequently asked questions

### Is KeyStage free?

KeyStage costs $29.99, and also offers in-app purchases.

### Is NuRack Auv3 FX Processor free?

NuRack Auv3 FX Processor costs $7.99, with no in-app purchases.

### Which has better reviews, KeyStage or NuRack Auv3 FX Processor?

KeyStage and NuRack Auv3 FX Processor are both rated 4.7 out of 5 on the App Store, from 37 and 42 ratings respectively.

### Do KeyStage or NuRack Auv3 FX Processor have ads?

Neither KeyStage nor NuRack Auv3 FX Processor shows ads.

### Which is updated more often, KeyStage or NuRack Auv3 FX Processor?

KeyStage ships an update every 3 months, and NuRack Auv3 FX Processor every 3 weeks. Most recently, KeyStage was updated on September 18, 2026 and NuRack Auv3 FX Processor on October 15, 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.*