# M2DX vs Callback Freeverb

The clearest difference is rating: Callback Freeverb at 5.0 against M2DX's 4.0. Callback Freeverb also leads on in-app purchases (none vs 1). M2DX's advantage is ratings volume (4 vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. M2DX sells 1 one-off in-app purchase. Callback Freeverb asks for nothing beyond the download.

Callback Freeverb holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

## The numbers

| Metric | M2DX | Callback Freeverb |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/m2dx/id6763840208/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/callback-freeverb/id6775060495/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 days | — |
| Monetization | Free | Free |
| Size | 15 MB | 7 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Hakaru Hirose](https://appshunter.io/developer/1866507020) | [Callback Audio, LLC](https://appshunter.io/developer/1896220942) |

## What reviewers say

### M2DX

[App page](https://appshunter.io/ios/app/m2dx/id6763840208)

Create music with a powerful 6-operator FM synthesizer. Explore hand-crafted presets or import classic DX7 banks. Use the on-screen keyboard or connect MIDI controllers for a versatile music-making experience.

**Highlights:** 6-operator, 32-algorithm FM synthesis, On-screen keyboard with velocity control, DX7-format .syx bank import, 6-stage FX chain, AUv3 plug-in support, Native MIDI 2.0 support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| M2DX Pro Unlock | $9.99 | one-time |


### 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 M2DX free?

M2DX is free to download, with in-app purchases available.

### Is Callback Freeverb free?

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

### Which has better reviews, M2DX or Callback Freeverb?

Callback Freeverb is rated higher. M2DX averages 4.0 out of 5 from 4 ratings, while Callback Freeverb averages 5.0 from 1 ratings.

### Do M2DX or Callback Freeverb have ads?

Neither M2DX 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.*