# OnKey vs StageTracker Mobile

The clearest difference is price: StageTracker Mobile at Free against OnKey's $4.99. StageTracker Mobile also leads on update cadence (every 11 days vs every 2 months). OnKey's advantage is in-app purchases (none vs 2) and iOS requirement (14.1 vs 17.0). On ads and device support there is nothing between them.

StageTracker Mobile is free to download; OnKey costs $4.99 up front. StageTracker Mobile sells 2 in-app purchases, starting at $8.99 per month. OnKey asks for nothing beyond the download.

OnKey ships an update every 2 months, StageTracker Mobile every 11 days. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OnKey | StageTracker Mobile |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/onkey-scale-practice/id1638204692/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | Paid | — |
| Size | 2 MB | 45 MB |
| Requires iOS | **14.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Rea Meir](https://appshunter.io/developer/1638204694) | [Jens Lucking](https://appshunter.io/developer/1354611790) |

## What reviewers say

### 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


### StageTracker Mobile

[App page](https://appshunter.io/ios/app/stagetracker-mobile/id6762446711)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $8.99 | per month |
| Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is OnKey free?

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

### Is StageTracker Mobile free?

StageTracker Mobile is free to download, with in-app purchases available.

### Do OnKey or StageTracker Mobile have ads?

Neither OnKey nor StageTracker Mobile shows ads.

### Which is updated more often, OnKey or StageTracker Mobile?

OnKey ships an update every 2 months, and StageTracker Mobile every 11 days. Most recently, OnKey was updated on November 3, 2026 and StageTracker Mobile on October 24, 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.*