Shelly Plus 1

The Shelly Plus 1 is a compact Wi-Fi relay that fits behind existing light switches and outlets, adding smart control without replacing your hardware. At just 42mm × 36mm × 17mm, it's one of the smallest smart relays available and works with both 110-240V AC and 12V DC.

Shelly devices are fully local-first with a comprehensive REST and RPC API that works over HTTP, MQTT, and WebSocket. No cloud account is required — the device hosts its own web interface for configuration and control. The Shelly Cloud app is available but entirely optional.

The Plus 1 uses an ESP32 chip with Bluetooth for setup and supports scripting via mJS for custom automation logic running directly on the device. It handles up to 16A switching, making it suitable for lights, fans, garage doors, and other appliances.