# Tetratonics vs MultiTuneKeys

The clearest difference is price: MultiTuneKeys at Free against Tetratonics's $0.99. Tetratonics's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

MultiTuneKeys is free to download; Tetratonics costs $0.99 up front. MultiTuneKeys sells 1 one-off in-app purchase. Tetratonics asks for nothing beyond the download.

Tetratonics ships an update every 6 days, MultiTuneKeys every 9 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Tetratonics | MultiTuneKeys |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Every 9 days |
| Monetization | Paid | — |
| Size | 143 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oliver Richard Erich Naumann](https://appshunter.io/developer/1790724923) | [Yasuhiro Misawa](https://appshunter.io/developer/1892754235) |

## 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


### MultiTuneKeys

[App page](https://appshunter.io/ios/app/multitunekeys/id6764493629)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Tetratonics free?

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

### Is MultiTuneKeys free?

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

### Do Tetratonics or MultiTuneKeys have ads?

MultiTuneKeys shows ads; Tetratonics does not.

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

Tetratonics ships an update every 6 days, and MultiTuneKeys every 9 days. Most recently, Tetratonics was updated on October 31, 2026 and MultiTuneKeys 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.*