# Harmonizer vs Synesthesia

The clearest difference is rating: Harmonizer at 4.1 against Synesthesia's 2.3. Synesthesia's advantage is update cadence (monthly vs every 33 months) and device support (3 vs 1). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Harmonizer holds the better App Store score, 4.1 against 2.3. Both are backed by a comparable volume of ratings — 16 and 16 respectively. Written reviews point the same way: 45% of Harmonizer's written reviews are positive against 38% of Synesthesia's.

Harmonizer ships an update every 33 months, Synesthesia monthly. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Harmonizer | Synesthesia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (16 ratings)](https://appshunter.io/ios/app/harmonizer/id393762975/reviews)** | [2.3 (16 ratings)](https://appshunter.io/ios/app/synesthesia-music-visualizer/id1046438840/reviews) |
| Number of ratings | 16 | 16 |
| Positive reviews | **45.5% of reviews** | 37.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 33 months | **Monthly** |
| Monetization | Free | Free |
| Size | 3 MB | 31 MB |
| Requires iOS | 17.0 | **8.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthew McLaughlin](https://appshunter.io/developer/1671041622) | [Christian Auzinger](https://appshunter.io/developer/918405870) |

## What reviewers say

### Harmonizer

[App page](https://appshunter.io/ios/app/harmonizer/id393762975)

This app helps infants develop perfect pitch by playing Shepard tones, aiding in pitch identity development. It also facilitates the study of chord relationships and displays the pitch of your singing.

**Highlights:** Shepard tone playback, Pitch identity development, Chord relationship study, Vocal pitch display, Infant music education

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

**In-app purchases:** none


### Synesthesia

[App page](https://appshunter.io/ios/app/synesthesia-music-visualizer/id1046438840)

Experience music through a spectrum of colors, mimicking the sensory phenomenon of synesthesia. Use it as a dynamic mood light, a calming night light, or to visualize the pitches of songs and instruments.

**Highlights:** Music visualization, Mood lighting, Night light functionality, Pitch to color mapping, Microphone access for real-time audio

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Harmonizer free?

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

### Is Synesthesia free?

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

### Which has better reviews, Harmonizer or Synesthesia?

Harmonizer is rated higher. Harmonizer averages 4.1 out of 5 from 16 ratings, while Synesthesia averages 2.3 from 16 ratings.

### Do Harmonizer or Synesthesia have ads?

Neither Harmonizer nor Synesthesia shows ads.

### Which is updated more often, Harmonizer or Synesthesia?

Harmonizer ships an update every 33 months, and Synesthesia monthly. Most recently, Harmonizer was updated on October 14, 2026 and Synesthesia on October 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.*