# SOUNDSLAYER Engine vs Checkmate

The clearest difference is in-app purchases: SOUNDSLAYER Engine at none against Checkmate's 2. SOUNDSLAYER Engine also leads on device support (4 vs 2). Checkmate's advantage is update cadence (every 4 days vs every 8 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Checkmate sells 2 in-app purchases, starting at $2.99 per month. SOUNDSLAYER Engine asks for nothing beyond the download.

SOUNDSLAYER Engine ships an update every 8 months, Checkmate every 4 days. The most recent releases landed on September 14, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SOUNDSLAYER Engine | Checkmate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 days** |
| Size | 63 MB | 80 MB |
| Requires iOS | **13.0** | 14.0.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PANASONIC ENTERTAINMENT & COMMUNICATION CO., LTD.](https://appshunter.io/developer/1668304757) | [Cedars Business Services, LLC](https://appshunter.io/developer/1821873441) |

## What reviewers say

### SOUNDSLAYER Engine

[App page](https://appshunter.io/ios/app/soundslayer-engine/id6503490203)

**In-app purchases:** none


### Checkmate

[App page](https://appshunter.io/ios/app/checkmate-split-bills-fast/id6757447031)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $24.99 | per year |


## Frequently asked questions

### Is SOUNDSLAYER Engine free?

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

### Is Checkmate free?

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

### Do SOUNDSLAYER Engine or Checkmate have ads?

Neither SOUNDSLAYER Engine nor Checkmate shows ads.

### Which is updated more often, SOUNDSLAYER Engine or Checkmate?

SOUNDSLAYER Engine ships an update every 8 months, and Checkmate every 4 days. Most recently, SOUNDSLAYER Engine was updated on September 14, 2026 and Checkmate on September 22, 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.*