# Synesthesia Synth vs Callback Freeverb

Synesthesia Synth and Callback Freeverb are too close to call on the numbers: across 8 compared parameters — price, rating, ratings volume and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

On the App Store both sit at effectively the same score — 5.0 for Synesthesia Synth against 5.0 for Callback Freeverb. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

## The numbers

| Metric | Synesthesia Synth | Callback Freeverb |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/synesthesia-synth/id6763379132/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/callback-freeverb/id6775060495/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Monetization | Free | Free |
| Size | 141 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MICHELE ZACCAGNINI](https://appshunter.io/developer/1895288560) | [Callback Audio, LLC](https://appshunter.io/developer/1896220942) |

## What reviewers say

### Synesthesia Synth

[App page](https://appshunter.io/ios/app/synesthesia-synth/id6763379132)

An experimental audio-visual instrument that allows users to sculpt evolving spatial audio by manipulating floating capsules. Position, rotation, and pulse changes affect tone, texture, and synchronized particle generation. It's a visual synthesizer, not a game.

**Highlights:** Experimental audio-visual instrument, Sculpt evolving spatial audio, Manipulate floating capsules, Control tone, texture, and particles, Visual synthesizer

**In-app purchases:** none


### Callback Freeverb

[App page](https://appshunter.io/ios/app/callback-freeverb/id6775060495)

This app offers a classic algorithmic reverb effect based on the Freeverb algorithm. It adds depth, space, and atmosphere to audio sources, creating lush, spacious ambience. Designed for mono use, it provides a smooth, musical reverb tail suitable for vocals and synthesizers.

**Highlights:** Classic Freeverb algorithm, Schroeder/Moorer reverb topology, Comb and allpass filters, Mono operation, Adds depth and space to audio, Smooth, musical reverb tail

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Synesthesia Synth free?

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

### Is Callback Freeverb free?

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

### Which has better reviews, Synesthesia Synth or Callback Freeverb?

Synesthesia Synth and Callback Freeverb are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Synesthesia Synth or Callback Freeverb have ads?

Neither Synesthesia Synth nor Callback Freeverb shows ads.

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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.*