# Instrument Scales vs StringPilot

The clearest difference is in-app purchases: StringPilot at none against Instrument Scales's 3. StringPilot also leads on update cadence (every 4 days vs monthly) and iOS requirement (15.1 vs 18.0). Instrument Scales's advantage is device support (5 vs 2). On price and ads there is nothing between them.

Both are free to download. Instrument Scales sells 3 in-app purchases, starting at $0.99 per month. StringPilot asks for nothing beyond the download.

Instrument Scales ships an update monthly, StringPilot every 4 days. The most recent releases landed on September 24, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Instrument Scales | StringPilot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (29 ratings)](https://appshunter.io/ios/app/instrument-scales/id1500152877/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 33 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | **iPhone, iPad, Mac, Apple Watch, Vision Pro** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thiago Anderson Martins](https://appshunter.io/developer/1287000521) | [浩铭 顾](https://appshunter.io/developer/1873844063) |

## What reviewers say

### Instrument Scales

[App page](https://appshunter.io/ios/app/instrument-scales/id1500152877)

Master your instrument with interactive courses, AI-powered guidance, and a comprehensive music toolkit. Learn chords, scales, and theory for guitar, bass, and piano with a precision tuner and custom tuning options.

**Highlights:** Interactive Courses, AI-powered guidance, Precision Tuner, 100+ Scale Library, Custom Tunings, iCloud Sync

**Features:** Family Sharing, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Instrument Scales Max | $0.99 | per month |
| Instrument Scales Max | $3.99 | per year |
| Instrument Scales Pro | $0.99 | one-time |


### StringPilot

[App page](https://appshunter.io/ios/app/stringpilot/id6759282296)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Instrument Scales free?

Instrument Scales is free to download, with in-app purchases available.

### Is StringPilot free?

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

### Do Instrument Scales or StringPilot have ads?

Neither Instrument Scales nor StringPilot shows ads.

### Which is updated more often, Instrument Scales or StringPilot?

Instrument Scales ships an update monthly, and StringPilot every 4 days. Most recently, Instrument Scales was updated on September 24, 2026 and StringPilot on September 13, 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.*