# 4trMTR vs SynthBridge MIDI Synth

The clearest difference is price: SynthBridge MIDI Synth at Free against 4trMTR's $0.99. SynthBridge MIDI Synth also leads on iOS requirement (15.0 vs 17.6). 4trMTR's advantage is in-app purchases (none vs 7). On review sentiment, update cadence, ads and device support there is nothing between them.

SynthBridge MIDI Synth is free to download; 4trMTR costs $0.99 up front. SynthBridge MIDI Synth sells 7 in-app purchases, starting at $1.99 per month. 4trMTR asks for nothing beyond the download.

4trMTR ships an update every 3 weeks, SynthBridge MIDI Synth every 11 days. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 4trMTR | SynthBridge MIDI Synth |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.7 (3 ratings)](https://appshunter.io/ios/app/synthbridge-midi-synth/id6778690596/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 76 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YUKIO TOKIWA](https://appshunter.io/developer/6776055556) | [啟东 徐](https://appshunter.io/developer/6778238620) |

## What reviewers say

### 4trMTR

[App page](https://appshunter.io/ios/app/4trmtr/id6776449627)

Record and layer multiple musical performances one track at a time to create a complete song. Easily manage your projects by saving, loading, and creating new ones through a simple tap interface.

**Highlights:** Four-track recording, Layered performances, Project saving, Project loading, New project creation

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

**In-app purchases:** none


### SynthBridge MIDI Synth

[App page](https://appshunter.io/ios/app/synthbridge-midi-synth/id6778690596)

Transform your device into a versatile MIDI sound module and virtual piano. Load SoundFont files, connect controllers, and utilize expressive performance tools for practice, production, or live music.

**Highlights:** MIDI controller support (Bluetooth, USB, Network), SoundFont (SF2/SF3) loading and playback, Multi-touch piano keyboard and drum pads, Pitch bend and modulation wheels, MIDI file playback and recording, Customizable velocity curves

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud Monthly | $1.99 | per month |
| Cloud Yearly | $12.99 | per year |
| Supporter Tip | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |
| Supporter Plus | $4.99 | one-time |
| SynthBridge Pro | $4.99 | one-time |
| Supporter Patron | $9.99 | one-time |


## Frequently asked questions

### Is 4trMTR free?

4trMTR costs $0.99, with no in-app purchases.

### Is SynthBridge MIDI Synth free?

SynthBridge MIDI Synth is free to download, with in-app purchases available.

### Do 4trMTR or SynthBridge MIDI Synth have ads?

Neither 4trMTR nor SynthBridge MIDI Synth shows ads.

### Which is updated more often, 4trMTR or SynthBridge MIDI Synth?

4trMTR ships an update every 3 weeks, and SynthBridge MIDI Synth every 11 days. Most recently, 4trMTR was updated on October 6, 2026 and SynthBridge MIDI Synth on October 13, 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.*