# 16 Relay Controller

> 16 Relay Controller (iPhone/iPad app by Mike Henry.)

- Source: https://appshunter.io/ios/app/16-relay-controller/id1541478119 (this page in markdown: same URL + `.md`)
- Developer: [Mike Henry](https://appshunter.io/developer/1219782847)
- Category: Utilities, Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 18.6 · 0 MB
- Languages: American English
- Released: 2020-12-14
- Data updated: 2026-08-13
- User reviews in markdown: https://appshunter.io/ios/app/16-relay-controller/id1541478119/reviews.md

## What is 16 Relay Controller?

App to control henry solutions 16 Relay hardware devices.
The 16 Relay controller connects to an IOT device via web service calls.  The webservice endpoints you connect to is determined by the application settings.  The default IP address of the webservice for the relay controller is set to a non-routable IP address of 192.168.4.2.  The app only uses http and not https so it is only suitable for controlling IOT devices in a closed environment.
The 16 Relay controller is limited to sending only the following URL request to the IP address you enter in the settings:
http://[ip-address]/status
http://[ip-address]/status/[relay-number]
http://[ip-address]/on/[relay-number]
http://[ip-address]/off/[relay-number]
http://[ip-address]/allon
http://[ip-address]/alloff
http://[ip-address]/hb


## Version history (last 3 releases)

### 1.3 — 2026-08-11

Updates privacy policy URL.  No code or privacy policy changes.

### 1.2 — 2026-08-11

Change URL for privacy policy.  No app changes and no change to the privacy policy.

### 1.0 — 2020-12-14

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*