Shelly Smart Relays Review: Tiny Modules, Big Smart Home Power
Shelly Smart Relays are compact Wi‑Fi modules that sit behind your existing switches or sockets, turning “dumb” circuits into fully connected smart devices. Unlike many smart bulbs or plugs, Shelly relays keep your familiar wall switches while adding app control, schedules, and integrations with Alexa, Google Home, and Home Assistant.
For DIY‑friendly smart home enthusiasts, Shelly is especially attractive because it works over standard Wi‑Fi, doesn’t require a proprietary hub, and offers powerful local control options. If you’re comfortable with basic electrical work (or using a qualified electrician), a Shelly Smart Relay on Amazon can be one of the most flexible upgrades you make.
Key features of Shelly Smart Relays
| Feature | Details |
|---|---|
| Form factor | Ultra‑compact module designed to fit behind switches or in junction boxes |
| Connectivity | 2.4 GHz Wi‑Fi, no dedicated hub required |
| Control options | Mobile app, cloud, local web UI, REST API, MQTT, scenes & schedules |
| Voice assistants | Works with Amazon Alexa and Google Home (via Shelly Cloud) |
| Energy monitoring | Selected models provide real‑time and historical consumption data |
| Automation | Timers, sunrise/sunset rules, and advanced scripting on supported models |
| Integration | Excellent support for Home Assistant and other open‑source platforms |
Everyday use and installation notes
In day‑to‑day use, Shelly relays feel almost invisible—which is exactly the point. Your existing switches still work as normal, but you gain remote control, automations, and energy insights. For many UK homes, the biggest challenge is often back‑box depth, so planning ahead and using a competent installer is essential.
If you’re building a broader smart home, Shelly relays pair nicely with other devices we’ve covered on Crown Product Reviews, such as smart plugs and lighting controls in our Best Smart Plugs UK guide. Used together, they give you fine‑grained control over both fixed wiring and plug‑in devices.
Overall, Shelly Smart Relays are ideal if you want powerful, flexible control without locking yourself into a closed ecosystem. For the best current pricing and bundle options, check the latest listings for the Shelly Smart Relay on Amazon.
Main alternatives to Shelly Smart Relays
| Alternative | Type | Pros | Cons |
|---|---|---|---|
| Sonoff Mini R4 | Wi‑Fi in‑wall relay | Very affordable, good app, works with Alexa/Google | Cloud‑centric by default, less flexible local control |
| Aqara Relay T1 | Zigbee relay | Strong Zigbee ecosystem, low power, good for larger setups | Requires a Zigbee hub, slightly more complex ecosystem |
| Fibaro Single Switch | Z‑Wave relay | Great for Z‑Wave controllers, robust and reliable | More expensive, needs Z‑Wave hub |
| TP‑Link Tapo Smart Switch Module | Wi‑Fi relay | Easy app, strong brand, good UK availability | Less advanced local integrations than Shelly |
If you value open integrations, local control, and detailed energy data, Shelly still stands out among these options. Before you decide, it’s worth comparing current prices and bundles for the Shelly Smart Relay on Amazon against the alternatives above.