# Scaler 3 vs IMPSY

The clearest difference is price: IMPSY at Free against Scaler 3's $12.99. IMPSY also leads on device support (3 vs 1). Scaler 3's advantage is update cadence (fortnightly vs every 4 months) and ratings volume (171 vs 2). On ads, in-app purchases and iOS requirement there is nothing between them.

IMPSY is free to download; Scaler 3 costs $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scaler 3 holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Scaler 3 has 171 ratings behind it against 2, so its average is the more settled of the two.

Scaler 3 ships an update fortnightly, IMPSY every 4 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Scaler 3 | IMPSY |
| --- | --- | --- |
| Price | $12.99 | **Free** |
| Rating | **[4.7 (171 ratings)](https://appshunter.io/ios/app/scaler-3/id6749147552/reviews)** | [4.5 (2 ratings)](https://appshunter.io/ios/app/impsy-intelligent-midi/id6771762122/reviews) |
| Number of ratings | **171** | 2 |
| Positive reviews | 56.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | Paid | **Free** |
| Size | 1.1 GB | 18 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Scaler Music](https://appshunter.io/developer/1603180477) | [Charles Martin](https://appshunter.io/developer/560849533) |

## What reviewers say

### Scaler 3

[App page](https://appshunter.io/ios/app/scaler-3/id6749147552)

This music theory workstation helps you discover chords, explore harmony, and build complete musical ideas. It offers a redesigned workflow, expanded creative potential, and powerful new capabilities for songwriting and music production.

**Highlights:** Discover music's key with MIDI and audio detection, Access over 1,000 chord sets, keys, and modes, Build intelligent chord progressions with automatic voice-leading, Structure full musical ideas with Scenes and Arrange Page, Transform chords into melodies, basslines, and phrases, Explore harmony with Circle of Fifths and modulation tools, Host AUv3 plugins and interoperate with desktop versions

**Features:** Vision Pro support

**In-app purchases:** none


### IMPSY

[App page](https://appshunter.io/ios/app/impsy-intelligent-midi/id6771762122)

This app acts as an AI MIDI partner, improvising musical responses to your playing. It can be used as an AUv3 plugin in DAWs or standalone, offering customizable AI models and MIDI mapping.

**Highlights:** AI-powered musical improvisation, AUv3 MIDI Processor for DAWs, Standalone Core MIDI virtual ports, Customizable AI model loading, Extensive MIDI mapping options, VoiceOver and Dynamic Type support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Scaler 3 free?

Scaler 3 costs $12.99, with no in-app purchases.

### Is IMPSY free?

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

### Which has better reviews, Scaler 3 or IMPSY?

Scaler 3 is rated higher. Scaler 3 averages 4.7 out of 5 from 171 ratings, while IMPSY averages 4.5 from 2 ratings.

### Do Scaler 3 or IMPSY have ads?

Neither Scaler 3 nor IMPSY shows ads.

### Which is updated more often, Scaler 3 or IMPSY?

Scaler 3 ships an update fortnightly, and IMPSY every 4 months. Most recently, Scaler 3 was updated on November 5, 2026 and IMPSY 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.*