# Jazz Scales Trainer vs OnKey

Jazz Scales Trainer and OnKey both sit at 3.0 stars, but that hides the real split: 80% of Jazz Scales Trainer's written reviews are positive against 0% of OnKey's. Jazz Scales Trainer also leads on price ($2.99 vs $4.99). OnKey's advantage is update cadence (every 2 months vs every 22 months). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Jazz Scales Trainer costs $2.99 and OnKey $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 3.0 for Jazz Scales Trainer against 3.0 for OnKey. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 80% of Jazz Scales Trainer's written reviews are positive against 0% of OnKey's.

Jazz Scales Trainer ships an update every 22 months, OnKey every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Jazz Scales Trainer | OnKey |
| --- | --- | --- |
| Price | **$2.99** | $4.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/jazz-scales-trainer/id1621849274/reviews) | [3.0 (2 ratings)](https://appshunter.io/ios/app/onkey-scale-practice/id1638204692/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | **80.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 8 MB | 2 MB |
| Requires iOS | 15.2 | **14.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Martin Miller](https://appshunter.io/developer/1621849276) | [Rea Meir](https://appshunter.io/developer/1638204694) |

## What reviewers say

### Jazz Scales Trainer

[App page](https://appshunter.io/ios/app/jazz-scales-trainer/id1621849274)

Master jazz improvisation with play-along exercises focused on scales. Practice single scales and transitions, with customizable accompaniment beats and chords. Prepare for jam sessions by analyzing your favorite songs and selecting scale proposals for each chord.

**Highlights:** Play-along jazz scale exercises, Scale transition training, Customizable accompaniment beats and chords, Song analysis for scale selection, Instrument configuration (clef, pitch, range)

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

**In-app purchases:** none


### OnKey

[App page](https://appshunter.io/ios/app/onkey-scale-practice/id1638204692)

This app generates readable, note-based exercises for practicing scales and chords. It's ideal for musicians of all levels looking for a focused and efficient way to improve their technique and theory knowledge without manual preparation.

**Highlights:** Generate note-based exercises, Select scale or chord type, Transpose to any key, Set range and clef, Choose from various patterns, Add note names and time signatures

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

**In-app purchases:** none


## Frequently asked questions

### Is Jazz Scales Trainer free?

Jazz Scales Trainer costs $2.99, with no in-app purchases.

### Is OnKey free?

OnKey costs $4.99, with no in-app purchases.

### Which has better reviews, Jazz Scales Trainer or OnKey?

Jazz Scales Trainer and OnKey are both rated 3.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do Jazz Scales Trainer or OnKey have ads?

Neither Jazz Scales Trainer nor OnKey shows ads.

### Which is updated more often, Jazz Scales Trainer or OnKey?

Jazz Scales Trainer ships an update every 22 months, and OnKey every 2 months. Most recently, Jazz Scales Trainer was updated on November 3, 2026 and OnKey on November 3, 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.*