# Tetratonics vs ApproachNote

The clearest difference is price: ApproachNote at Free against Tetratonics's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

ApproachNote is free to download; Tetratonics costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tetratonics ships an update every 6 days, ApproachNote every 10 days. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Tetratonics | ApproachNote |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 10 days |
| Monetization | Paid | — |
| Size | 143 MB | 30 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Oliver Richard Erich Naumann](https://appshunter.io/developer/1790724923) | [Dave Rodger](https://appshunter.io/developer/1795224127) |

## What reviewers say

### Tetratonics

[App page](https://appshunter.io/ios/app/tetratonics-the-4th-dimension/id6759824577)

Explore modern jazz harmony by adding a single color tone to familiar triads. This app provides a visual and auditory laboratory for improvisers, composers, and arrangers to create sophisticated voicings and understand harmonic relationships.

**Highlights:** Triad + 1 harmonic structures, 10 curated tetratonic combinations, High-fidelity Sound Studio with two layers, Context-aware audio engine, Harmonic visualizer with color-coded notes, Flawless enharmonic calculation and chord symbol generation, Customizable sequencer and arpeggio patterns

**In-app purchases:** none


### ApproachNote

[App page](https://appshunter.io/ios/app/approachnote/id6762489861)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tetratonics free?

Tetratonics costs $0.99, with no in-app purchases.

### Is ApproachNote free?

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

### Do Tetratonics or ApproachNote have ads?

Neither Tetratonics nor ApproachNote shows ads.

### Which is updated more often, Tetratonics or ApproachNote?

Tetratonics ships an update every 6 days, and ApproachNote every 10 days. Most recently, Tetratonics was updated on October 16, 2026 and ApproachNote on October 25, 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.*