# JAX MIDI ModulePlayer vs SL Knock

The clearest difference is price: SL Knock at $6.99 against JAX MIDI ModulePlayer's $29.99. SL Knock also leads on update cadence (weekly vs every 6 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

JAX MIDI ModulePlayer costs $29.99 and SL Knock $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

JAX MIDI ModulePlayer ships an update every 6 months, SL Knock weekly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | JAX MIDI ModulePlayer | SL Knock |
| --- | --- | --- |
| Price | $29.99 | **$6.99** |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/jax-midi-moduleplayer/id1628626015/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Paid | — |
| Size | 24 MB | 28 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jens Guell](https://appshunter.io/developer/1195004865) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### JAX MIDI ModulePlayer

[App page](https://appshunter.io/ios/app/jax-midi-moduleplayer/id1628626015)

This app functions as a General MIDI compatible multi-timbre synthesizer and file player. It can be used as a sound module for external MIDI signals or as an audio unit within compatible host applications. Create and play back standard MIDI files with over 370 instruments and drum sets.

**Highlights:** GM/GS compatible synthesizer, Plays standard MIDI files, Over 370 instruments and drum sets, 16 MIDI channels simultaneously, Audio Unit (AUv3) support, Standalone host functionality, Universal app for Apple devices

**Features:** Vision Pro support

**In-app purchases:** none


### SL Knock

[App page](https://appshunter.io/ios/app/sl-knock/id6797349065)

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

**In-app purchases:** none


## Frequently asked questions

### Is JAX MIDI ModulePlayer free?

JAX MIDI ModulePlayer costs $29.99, with no in-app purchases.

### Is SL Knock free?

SL Knock costs $6.99, with no in-app purchases.

### Do JAX MIDI ModulePlayer or SL Knock have ads?

Neither JAX MIDI ModulePlayer nor SL Knock shows ads.

### Which is updated more often, JAX MIDI ModulePlayer or SL Knock?

JAX MIDI ModulePlayer ships an update every 6 months, and SL Knock weekly. Most recently, JAX MIDI ModulePlayer was updated on October 28, 2026 and SL Knock on October 31, 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.*