# MelodySlotMachine vs SL Knock

The clearest difference is price: MelodySlotMachine at Free against SL Knock's $6.99. MelodySlotMachine also leads on iOS requirement (11.4 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

MelodySlotMachine is free to download; SL Knock costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | MelodySlotMachine | SL Knock |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/melodyslotmachine/id1559407284/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free | — |
| Size | 192 MB | 28 MB |
| Requires iOS | **11.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [newforestar co,.ltd](https://appshunter.io/developer/293922531) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### MelodySlotMachine

[App page](https://appshunter.io/ios/app/melodyslotmachine/id1559407284)

Create new melody combinations by rearranging variations using slot dials. This AI-powered tool analyzes musical structure to generate new compositions, aiding composers in projects requiring many variations. Explore next-generation music production and consumption.

**Highlights:** Dial-based melody variation selection, Grid tile operation for timeline visualization, Melody shuffle via device shake, Song and part selection, AI-driven musical structure analysis, Next-generation music creation

**Features:** macOS Compatibility, 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 MelodySlotMachine free?

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

### Is SL Knock free?

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

### Do MelodySlotMachine or SL Knock have ads?

Neither MelodySlotMachine nor SL Knock shows ads.

### Which is updated more often, MelodySlotMachine or SL Knock?

MelodySlotMachine ships an update weekly, and SL Knock weekly. Most recently, MelodySlotMachine was updated on October 15, 2026 and SL Knock on October 16, 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.*