Shelly makes tiny Wi-Fi relays and energy meters that hide inside your existing wall boxes, turning regular switches and appliances into smart, power-measuring devices.
Shelly devices — like the Shelly 1 and Plus/Gen-series relays — wire in behind your current light switches and outlets, so your walls keep their normal look and manual switches keep working. Every device runs locally over Wi-Fi with its own web interface, needs no hub, and reports detailed energy consumption. The range covers relays, dimmers, smart plugs, bulbs, sensors and the Pro series for DIN-rail electrical panels. Because Shelly speaks MQTT, HTTP and webhooks natively, it is a favorite building block for DIY and professional automations alike.
Shelly’s Plus and Pro devices also include on-device scripting, so automations can run directly on the relay itself — no server or hub required. The company (Shelly Group, based in Bulgaria) builds its products to proper electrical certification standards, which genuinely matters for devices designed to live permanently inside your walls.
Shelly hardware is inexpensive and subscription-free: relays and plugs start from about $13-$20 each, sensors from about $20, and Pro panel devices from about $50. The Shelly app is free; the optional Shelly Cloud Premium adds extended data history and extras.
DIYers, electricians and Home Assistant users who want invisible, reliable smart control and serious energy data without replacing switches or depending on a cloud. Anyone unsure about wiring should have an electrician fit the first relay — after that, the system grows device by device.