# Guitar Permutation Trainer vs Cantus

The clearest difference is price: Cantus at Free against Guitar Permutation Trainer's $1.99. Cantus also leads on update cadence (every 5 days vs every 3 months) and iOS requirement (15.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Cantus is free to download; Guitar Permutation Trainer costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Guitar Permutation Trainer ships an update every 3 months, Cantus every 5 days. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Guitar Permutation Trainer | Cantus |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cantus-voicing-lab/id6772984019/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free |
| Size | 2 MB | 3 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Chouinard](https://appshunter.io/developer/1826188450) | [Jason Zachariah](https://appshunter.io/developer/1896513710) |

## What reviewers say

### Guitar Permutation Trainer

[App page](https://appshunter.io/ios/app/guitar-permutation-trainer/id6748545844)

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

**In-app purchases:** none


### Cantus

[App page](https://appshunter.io/ios/app/cantus-voicing-lab/id6772984019)

This interactive tool helps musicians explore harmony and chord voicings on a virtual piano. It allows users to visualize how notes move within chords, understand modal relationships, and develop a feel for harmony through focused practice.

**Highlights:** Interactive chord and voicing exploration, Piano keyboard visualization, Modal and scale-based harmony practice, Voice-leading movement analysis, Tone.js audio playback, Account-free operation

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

**In-app purchases:** none


## Frequently asked questions

### Is Guitar Permutation Trainer free?

Guitar Permutation Trainer costs $1.99, with no in-app purchases.

### Is Cantus free?

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

### Do Guitar Permutation Trainer or Cantus have ads?

Neither Guitar Permutation Trainer nor Cantus shows ads.

### Which is updated more often, Guitar Permutation Trainer or Cantus?

Guitar Permutation Trainer ships an update every 3 months, and Cantus every 5 days. Most recently, Guitar Permutation Trainer was updated on October 24, 2026 and Cantus on October 21, 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.*