# Fretzl vs Phys. Lab

The clearest difference is price: Fretzl at Free against Phys. Lab's $4.99. Phys. Lab's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs monthly). On ads and device support there is nothing between them.

Fretzl is free to download; Phys. Lab costs $4.99 up front. Fretzl sells 2 in-app purchases, starting at $4.99 per month. Phys. Lab asks for nothing beyond the download.

Fretzl ships an update monthly, Phys. Lab fortnightly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Fretzl | Phys. Lab |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/fretzl-guitars-language-app/id6449849362/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Freemium | — |
| Size | 20 MB | 24 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Decbl LLC](https://appshunter.io/developer/1690856569) | [坤 冉](https://appshunter.io/developer/1759927074) |

## What reviewers say

### Fretzl

[App page](https://appshunter.io/ios/app/fretzl-guitars-language-app/id6449849362)

Learn guitar fundamentals and advanced concepts through structured courses on notes, intervals, chords, and scales. This app uses spaced repetition and an intuitive approach to build fretboard skills and ear training, helping you understand your playing beyond memorizing tabs.

**Highlights:** Structured courses on notes, intervals, chords, and scales, Spaced repetition for memory retention, Intuitive and hands-on learning approach, Fretboard skill building, Ear training, Built-in tuner

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fretzl Pro (Monthly) | $4.99 | per month |
| Fretzl Pro (Yearly) | $39.99 | per year |


### Phys. Lab

[App page](https://appshunter.io/ios/app/phys-lab/id6744642758)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fretzl free?

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

### Is Phys. Lab free?

Phys. Lab costs $4.99, with no in-app purchases.

### Do Fretzl or Phys. Lab have ads?

Neither Fretzl nor Phys. Lab shows ads.

### Which is updated more often, Fretzl or Phys. Lab?

Fretzl ships an update monthly, and Phys. Lab fortnightly. Most recently, Fretzl was updated on November 3, 2026 and Phys. Lab on November 5, 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.*