# Synesthesia vs Ferromagnetic

The clearest difference is rating: Ferromagnetic at 4.1 against Synesthesia's 2.3. Ferromagnetic also leads on review sentiment (80% vs 38%) and update cadence (weekly vs monthly). Synesthesia's advantage is in-app purchases (none vs 6) and iOS requirement (8.0 vs 16.0). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Ferromagnetic sells 6 in-app purchases, starting at $2.49 per month. Synesthesia asks for nothing beyond the download.

Ferromagnetic holds the better App Store score, 4.1 against 2.3. Both are backed by a comparable volume of ratings — 16 and 26 respectively. Written reviews point the same way: 38% of Synesthesia's written reviews are positive against 80% of Ferromagnetic's.

Synesthesia ships an update monthly, Ferromagnetic weekly. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Synesthesia | Ferromagnetic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (16 ratings)](https://appshunter.io/ios/app/synesthesia-music-visualizer/id1046438840/reviews) | **[4.1 (26 ratings)](https://appshunter.io/ios/app/ferromagnetic/id1546537151/reviews)** |
| Number of ratings | 16 | **26** |
| Positive reviews | 37.5% of reviews | **79.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 31 MB | 23 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Christian Auzinger](https://appshunter.io/developer/918405870) | [Daniel Eke](https://appshunter.io/developer/886776646) |

## What reviewers say

### 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


### Ferromagnetic

[App page](https://appshunter.io/ios/app/ferromagnetic/id1546537151)

Transform music into real-time visual art with dynamic audio-reactive effects. Enhance personal listening, create ambiance for gatherings, or perform live with captivating visuals that sync to every beat. Offers thousands of unique visual combinations for a fresh experience with every song.

**Highlights:** Real-time audio-reactive visuals, Multi-band frequency analysis, Automatic beat detection, Metal-powered rendering engine, Multi-layer compositing system, Customizable visual parameters, Thousands of unique visual combinations

**Features:** Family Sharing, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FM Visualizer | $2.49 | per month |
| FM Producer | $3.99 | per month |
| A generous tip | $0.99 | one-time |
| FM Visualizer One-TIme | $14.99 | one-time |
| FM Producer Upgrade | $29.99 | one-time |
| FM Producer One-Time | $49.99 | one-time |

**What reviewers like**

- ✨ Beautiful and classic visuals
- 🎶 Great music synchronization
- 💡 Highly customizable effects
- 💰 Excellent value for money (especially Pro/Lifetime)
- 🚀 Fast and responsive performance

**What reviewers complain about**

- 🐛 Song titles don't update
- 🐛 Custom image saving bug (fixed)
- 🐛 Blurry logo import
- 🐛 Crashing on launch
- 🐛 Poorly implemented controls (MacOS)

**Reported bugs**

- Song titles don’t update
- Custom image wasn’t saving in presets (reported fixed)
- Logo makes imported images blurry
- App crashes on launch
- Poorly implemented controls (MacOS)

**Requested features**

- Add a 'go back' button for controls
- Add Airplay mirroring or tvOS app
- More options in visualizer types
- Configurable presets for cycling settings
- Ability to stream to TV without a cable


## Frequently asked questions

### Is Synesthesia free?

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

### Is Ferromagnetic free?

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

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

Ferromagnetic is rated higher. Synesthesia averages 2.3 out of 5 from 16 ratings, while Ferromagnetic averages 4.1 from 26 ratings.

### Do Synesthesia or Ferromagnetic have ads?

Neither Synesthesia nor Ferromagnetic shows ads.

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

Synesthesia ships an update monthly, and Ferromagnetic weekly. Most recently, Synesthesia was updated on October 5, 2026 and Ferromagnetic on October 8, 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.*