# Interval Matrix Pro vs Fretlight

The clearest difference is price: Interval Matrix Pro at Free against Fretlight's $3.99. Fretlight's advantage is in-app purchases (none vs 4). On update cadence, ads, device support and iOS requirement there is nothing between them.

Interval Matrix Pro is free to download; Fretlight costs $3.99 up front. Interval Matrix Pro sells 4 in-app purchases, starting at $2.99 per 7 days. Fretlight asks for nothing beyond the download.

Interval Matrix Pro ships an update weekly, Fretlight every 9 days. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Interval Matrix Pro | Fretlight |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/interval-matrix-pro/id6756457753/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 143 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [JIMMY MICHAEL HUDSON](https://appshunter.io/developer/1860733207) | [Sean Tollefsen Sinclair](https://appshunter.io/developer/1885234602) |

## What reviewers say

### Interval Matrix Pro

[App page](https://appshunter.io/ios/app/interval-matrix-pro/id6756457753)

Visualize music theory concepts like scales, chords, and intervals across various instruments. This app uses a unique color-coding system to make complex musical relationships intuitive and easy to understand, moving beyond rote memorization.

**Highlights:** Visual music theory for guitar, piano, bass, and more, Color-based system for intuitive understanding, See scales, chords, modes, and intervals, Supports custom tunings and instruments, Extensive scale and mode library, Designed by a music educator

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Monthly Subscription | $10.99 | per month |
| Yearly Subscription | $49.99 | per year |
| Lifetime | $69.99 | one-time |


### Fretlight

[App page](https://appshunter.io/ios/app/fretlight/id6760599523)

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

**In-app purchases:** none


## Frequently asked questions

### Is Interval Matrix Pro free?

Interval Matrix Pro is free to download, with in-app purchases available.

### Is Fretlight free?

Fretlight costs $3.99, with no in-app purchases.

### Do Interval Matrix Pro or Fretlight have ads?

Neither Interval Matrix Pro nor Fretlight shows ads.

### Which is updated more often, Interval Matrix Pro or Fretlight?

Interval Matrix Pro ships an update weekly, and Fretlight every 9 days. Most recently, Interval Matrix Pro was updated on October 18, 2026 and Fretlight on October 14, 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.*