Relay controller

Relay Controller lets you control USB relay devices directly from your Android phone using a USB OTG cable.
No PC, no Raspberry Pi, and no programming required.

⚠️ USB relay hardware is required. This app is intended for users who work with USB relay modules.

Features

• Direct local control of USB relay devices via USB OTG
• Real-time monitoring and switching of relay states
• Optional remote control without cloud services

Remote control

You can control your USB relay remotely by pairing another device.
Pairing is simple — just scan a QR code or enter a short access code.

The remote device does not need to install any app.
It works instantly in any modern web browser, including:
iPhone, iPad, Android devices, PC, Mac, or tablets.