ThemisReviews
Smart home tech, weighed fairly.
Shelly and other Wi-Fi relays for hidden smart switching, ranked.
We pulled the Wi-Fi relays and in-wall modules on Amazon and scored them on rating, review volume, and features: power metering, local control, and dry contacts.
Prices, ratings, and review counts captured from Amazon on 2026-10-04.
A 16 A dry-contact Shelly with Matter for $22.99, rated 4.6 stars by 1,187 buyers.
A $12.99 low-voltage Wi-Fi relay for gates, PCs, and access control.
Two metered 16 A channels on Wi-Fi, Zigbee, or Matter.
Shelly's tiny Uni module for low-voltage buttons, sensors, and old appliances.
Swipe the table sideways to see every column.
| # | Relay | Price | Rating | Reviews | Works with | Channels | Load | Radios | Score |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Shelly 2PM Gen4 | $38.99 | 4.6 | 808 | 2 | 16 A per channel | Wi-Fi, Zigbee, Matter | 88 | |
| 2 | Shelly 1 Gen3 | $22.99 | 4.6 | 1,187 | 1 | 16 A dry contact | Wi-Fi, Matter | 83 | |
| 3 | Shelly 1 Gen4 | $24.99 | 4.4 | 1,211 | 1 | 16 A dry contact | Wi-Fi, Zigbee, Matter | 81 | |
| 4 | Shelly 1 Gen4 (4-pack) | $94.99 | 4.4 | 1,211 | 1 each, 4 relays | 16 A dry contact | Wi-Fi, Zigbee, Matter | 81 | |
| 5 | Shelly 1 Mini Gen4 | $24.98 | 4.5 | 811 | 1 | 8 A dry contact | Wi-Fi, Zigbee, Matter | 80 | |
| 6 | Shelly Plus Uni | $19.99 | 4.4 | 656 | 2 outputs | Low voltage only | Wi-Fi, Bluetooth | 79 | |
| 7 | Shelly 1PM Mini Gen4 (2-pack) | $54.86 | 4.6 | 439 | 1 each, 2 relays | 8 A | Wi-Fi, Zigbee, Matter | 79 | |
| 8 | MHCOZY 4-channel Wi-Fi/RF/Bluetooth relay | $21.90 | 4.5 | 349 | 4 | Dry contact | Wi-Fi, Bluetooth, 433 MHz RF | 77 | |
| 9 | eWeLink USB/DC Wi-Fi relay | $12.99 | 4.4 | 196 | 1 | Low-voltage dry contact | Wi-Fi | 68 | |
| 10 | Shelly 1 Gen4 UL | $27.99 | 4.5 | 10 | 1 | 15 A dry contact | Wi-Fi, Zigbee, Matter | 63 |
Works with: hover or tap an icon for the system name. A system is shown when it supports the product directly or through the hub the listing requires. Shelly relays also have an official Home Assistant integration that runs locally. Tuya/Smart Life relays work with Home Assistant's Tuya integration.
Scored out of 100: 45% customer rating, 30% review volume, 25% features.
Two metered channels for two lights, shades, or appliances.
The best all-round Wi-Fi relay: 16 A dry contacts and Matter for under $25.
The Gen4 version adds Zigbee, so it can join either your Wi-Fi or your Zigbee mesh.
Four Shelly 1 Gen4 relays, if you're doing a whole house.
The compact Shelly for crowded boxes and garage openers.
A tiny low-voltage module that turns buttons and old gadgets smart.
Two small metered relays to track what lights and gadgets use.
Four dry-contact channels with three modes, for gates, blinds, and garage doors.
A cheap low-voltage relay to push a PC power button or open a door strike.
The UL-certified Shelly 1 Gen4, for installs where certification matters.
It hides behind a wall switch, inside a fan canopy, or in an appliance and switches the power, so you keep your existing switch and add smart control. Dry-contact relays can also trigger garage doors, gas fireplaces, and boilers.
Most relays do. Check your switch box for a bundle of white wires before buying. A few models work without a neutral, and the table notes which.
Only if you're comfortable with household wiring and turn the breaker off first. If you're not sure, have an electrician install it. Never exceed the relay's amp rating.