# Midiflow Scales (Audiobus) vs Smart Scale Controller Pro

The clearest difference is price: Midiflow Scales (Audiobus) at $1.99 against Smart Scale Controller Pro's $99.99. Midiflow Scales (Audiobus) also leads on in-app purchases (none vs 3) and rating (3.8 vs 3.4). Smart Scale Controller Pro's advantage is update cadence (every 3 weeks vs every 9 months) and review sentiment (50% vs 33%). On ratings volume, ads, monetization model and device support there is nothing between them.

Midiflow Scales (Audiobus) costs $1.99 and Smart Scale Controller Pro $99.99 up front. Smart Scale Controller Pro sells 3 one-off in-app purchases. Midiflow Scales (Audiobus) asks for nothing beyond the download.

Midiflow Scales (Audiobus) holds the better App Store score, 3.8 against 3.4. Both are backed by a comparable volume of ratings — 4 and 9 respectively. Written reviews complicate that: 33% of Midiflow Scales (Audiobus)'s written reviews are positive against 50% of Smart Scale Controller Pro's, so the app with the better star average is not the one people write more warmly about.

Midiflow Scales (Audiobus) ships an update every 9 months, Smart Scale Controller Pro every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Midiflow Scales (Audiobus) | Smart Scale Controller Pro |
| --- | --- | --- |
| Price | **$1.99** | $99.99 |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/midiflow-scales-audiobus/id1107244767/reviews)** | [3.4 (9 ratings)](https://appshunter.io/ios/app/smart-scale-controller-pro/id1519381658/reviews) |
| Number of ratings | 4 | **9** |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 5 MB | 68 MB |
| Requires iOS | **10.2** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Johannes Doerr](https://appshunter.io/developer/622204117) | [9390-0801 Quebec inc](https://appshunter.io/developer/1517759983) |

## What reviewers say

### Midiflow Scales (Audiobus)

[App page](https://appshunter.io/ios/app/midiflow-scales-audiobus/id1107244767)

This MIDI effect app allows you to filter or remap incoming notes to fit a specific musical scale. It helps prevent incorrect notes, create harmonies, and simplify playing scales using your keyboard.

**Highlights:** Filter out notes outside a scale, Remap notes to the closest scale note, Play scales using only white keys, Select notes manually, Choose from predefined scales, Use multiple instances in Audiobus

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

**In-app purchases:** none


### Smart Scale Controller Pro

[App page](https://appshunter.io/ios/app/smart-scale-controller-pro/id1519381658)

Control keyboard scale and tuning in real-time. Offers seamless control over musical parameters for musicians, unlocking new creative possibilities. Perfect for live performances or studio sessions.

**Highlights:** Real-time scale tuning, Transpose, Pitch bend, Preset management, Bank select, OTG and BLE connectivity

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Virtual MIDI Devices | $4.99 | one-time |
| Unlimited Preset Banks | $4.99 | one-time |
| Plugin Mode — AUv3 Instruments | $30.00 | one-time |


## Frequently asked questions

### Is Midiflow Scales (Audiobus) free?

Midiflow Scales (Audiobus) costs $1.99, with no in-app purchases.

### Is Smart Scale Controller Pro free?

Smart Scale Controller Pro costs $99.99, and also offers in-app purchases.

### Which has better reviews, Midiflow Scales (Audiobus) or Smart Scale Controller Pro?

Midiflow Scales (Audiobus) is rated higher. Midiflow Scales (Audiobus) averages 3.8 out of 5 from 4 ratings, while Smart Scale Controller Pro averages 3.4 from 9 ratings.

### Do Midiflow Scales (Audiobus) or Smart Scale Controller Pro have ads?

Neither Midiflow Scales (Audiobus) nor Smart Scale Controller Pro shows ads.

### Which is updated more often, Midiflow Scales (Audiobus) or Smart Scale Controller Pro?

Midiflow Scales (Audiobus) ships an update every 9 months, and Smart Scale Controller Pro every 3 weeks. Most recently, Midiflow Scales (Audiobus) was updated on October 24, 2026 and Smart Scale Controller Pro on October 25, 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.*