# JP vs 4trMTR

The clearest difference is review sentiment: 4trMTR at 100% against JP's 0%. 4trMTR also leads on iOS requirement (17.6 vs 26.5). JP's advantage is price (Free vs $1.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

JP is free to download; 4trMTR costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

JP ships an update every 2 weeks, 4trMTR every 3 weeks. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | JP | 4trMTR |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/jp-square-synthesizer/id6768194312/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 37 MB | 12 MB |
| Requires iOS | 26.5 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kouki Yoshimoto](https://appshunter.io/developer/1884780659) | [YUKIO TOKIWA](https://appshunter.io/developer/6776055556) |

## What reviewers say

### JP

[App page](https://appshunter.io/ios/app/jp-square-synthesizer/id6768194312)

This application emulates a legendary analog polyphonic synthesizer, offering 8 distinct analog synth voices. Users can sculpt sounds with authentic VCF and ADSR controls, utilize an arpeggiator, and split the keyboard for dual-sound performance. Built-in effects and pitch lever allow for expressive sound design on the go.

**Highlights:** 8 Analog Synth Voices, Authentic VCF Control, ADSR Envelope, Arpeggiator with 5 Patterns, Split and Solo Modes, Reverb & Chorus Effects, Pitch Lever

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is JP free?

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

### Is 4trMTR free?

4trMTR costs $1.99, with no in-app purchases.

### Do JP or 4trMTR have ads?

Neither JP nor 4trMTR shows ads.

### Which is updated more often, JP or 4trMTR?

JP ships an update every 2 weeks, and 4trMTR every 3 weeks. Most recently, JP was updated on November 7, 2026 and 4trMTR on November 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.*