# Blue Switch vs yACK FAST

The clearest difference is in-app purchases: yACK FAST at none against Blue Switch's 1. yACK FAST also leads on ads (none vs shown) and iOS requirement (15.6 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Blue Switch sells 1 one-off in-app purchase. yACK FAST asks for nothing beyond the download.

Blue Switch ships an update every 3 months, yACK FAST every 2 months. The most recent releases landed on September 23, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Blue Switch | yACK FAST |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (43 ratings)](https://appshunter.io/ios/app/blue-switch/id828280876/reviews)** | — |
| Number of ratings | **43** | — |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 39 MB | 9 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Vitalij Schaefer](https://appshunter.io/developer/393749449) | [Serialio Ltd.](https://appshunter.io/developer/333178140) |

## What reviewers say

### Blue Switch

[App page](https://appshunter.io/ios/app/blue-switch/id828280876)

Control 2, 4, or 8 channel Bluetooth BLE relay modules from your iPhone or iPad. Assign custom names to modules and individual relays for easy identification and management. Enhance security by changing the default password.

**Highlights:** Control 2, 4, or 8 channel relay modules, Bluetooth BLE connectivity, Assign custom module aliases, Assign custom relay aliases, Change default password for security, Connect to multiple modules

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $17.99 | one-time |


### yACK FAST

[App page](https://appshunter.io/ios/app/yack-fast/id1166008825)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Blue Switch free?

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

### Is yACK FAST free?

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

### Do Blue Switch or yACK FAST have ads?

Blue Switch shows ads; yACK FAST does not.

### Which is updated more often, Blue Switch or yACK FAST?

Blue Switch ships an update every 3 months, and yACK FAST every 2 months. Most recently, Blue Switch was updated on September 23, 2026 and yACK FAST on September 8, 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.*