# Blue Switch vs 16 Relay Controller

The clearest difference is in-app purchases: 16 Relay Controller at none against Blue Switch's 1. 16 Relay Controller also leads on ads (none vs shown). Blue Switch's advantage is update cadence (every 3 months vs every 34 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Blue Switch sells 1 one-off in-app purchase. 16 Relay Controller asks for nothing beyond the download.

Blue Switch ships an update every 3 months, 16 Relay Controller every 34 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Blue Switch | 16 Relay Controller |
| --- | --- | --- |
| 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 34 months |
| Monetization | Free with in-app purchases | — |
| Size | 39 MB | 0 MB |
| Requires iOS | **18.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Vitalij Schaefer](https://appshunter.io/developer/393749449) | [Mike Henry](https://appshunter.io/developer/1219782847) |

## 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 |


### 16 Relay Controller

[App page](https://appshunter.io/ios/app/16-relay-controller/id1541478119)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Switch free?

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

### Is 16 Relay Controller free?

16 Relay Controller is free to download, with no in-app purchases.

### Do Blue Switch or 16 Relay Controller have ads?

Blue Switch shows ads; 16 Relay Controller does not.

### Which is updated more often, Blue Switch or 16 Relay Controller?

Blue Switch ships an update every 3 months, and 16 Relay Controller every 34 months. Most recently, Blue Switch was updated on September 23, 2026 and 16 Relay Controller on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*