Hong KongRefoss is a smart home brand active since 2016, best known for its multi-channel energy monitors and for smart plugs, switches and garage door openers. Its energy monitors clamp onto the mains and branch circuits and expose the readings through a local web UI, an open JSON-RPC API and MQTT, so they run without any cloud account. Refoss devices integrate natively with Home Assistant, Alexa, Google Home and Apple HomeKit.
View RefossShelly, based in Bulgaria, makes compact smart relays, switches, plugs and sensors that fit behind existing wall switches and outlets to automate almost any home wiring. Its devices are popular with advanced users for offering local control, a built-in web interface, MQTT and broad integration with Home Assistant, Alexa and Google Home. Shelly is a favorite for retrofitting smart control without replacing fixtures.
View ShellyEvery product from both brands
Each brand's full lineup, one above the other: tap any product for specs, compatibility and pricing.
Refoss3
View all 
Shelly52
View all - Buttons
BLU Button Tough 1 ZB
4.4(16)$23.99 - Buttons
BLU RC Button 4 ZB
4.1(26)$23.99 - Cameras
Camera
- Displays
8% OFFWall Display X1i
£150.09£163.15 - Displays
Wall Display XL
4.2(73)$349.99 - Displays
Wall Display
4.4(443) - Door & Window Sensors
BLU Door/Window Outdoor ZB
- Door & Window Sensors
BLU Door/Window ZB
4.5(50)$22.99 - Energy Monitors
3EM-63W Gen3
4.5(167)$114.99 - Energy Monitors
EM Gen3
4.6(274)$69.99 - Energy Monitors
EM Gen4
4.8(7)£63.84 - Energy Monitors
EM Mini Gen4
4.5(158)$24.99 - Energy Monitors
Pro 3EM 3CT63
4.4(379)$150.99 - Energy Monitors
Pro 3EM-400
4.3(21)$329.99 - Energy Monitors
Pro 3EM v2
4.6(111)$154.99 - Energy Monitors
Pro EM-50
4.6(968)$119.99 - Gas Detectors
GAS (CNG)
4.2(48)£82.00 - Gas Detectors
GAS (LPG)
- LED Bulbs
Multicolor Bulb E27 Gen3
4.3(40)£13.25 - Motion Sensors
BLU Motion ZB
4.5(73)$26.99 - Motion Sensors
18% OFFBlu Motion
4.0(1K)£17.14£20.87 - Plugs
Plug M Gen3
4.5(1K)€12.90 - Plugs
Plug PM Gen3
4.5(78) - Plugs
Smart Plug UL
4.2(211)$24.60 - Plugs
Smart Plug (US)
4.5(347) - Presence Sensors
Presence Gen4
4.0(26)$84.99 - Radiator Valves
BLU TRV
4.1(125)$64.99 - Relays
Shelly 1 Gen3
4.6(1.3K)$18.39 - Relays
Shelly 1 Gen4
4.3(24)£23.09 - Relays
Shelly 1 Mini Gen4
4.6(880)$24.98 - Relays
Shelly 1 Mini Gen3
4.5(4.9K) - Relays
Shelly 1L Gen4
5.0(3)€33.90 - Relays
Shelly 1PM Gen4
4.6(588)$28.99 - Relays
2L Gen4
5.0(1)£36.71 - Relays
Shelly 2PM Gen3
4.7(577) - Relays
2PM Gen4
4.7(882)$38.99 - Relays
Dimmer 0/1-10V PM Gen4
5.0(5)£34.10 - Relays
Dimmer Gen4
4.3(31)$49.98 - Relays
Shelly i4 Gen3
4.3(154)$19.99 - Relays
i4 Gen4
- Relays
Shelly Plus 1
4.6(322)$45.00 - Relays
19% OFFShelly Plus 1PM
4.6(167)€12.89€15.99 - Relays
10% OFFShelly Plus 2PM
4.6(3.9K)$34.50$38.22 - Relays
20% OFFPM Mini Gen3
4.6(1.4K)$11.59$14.49 - Relays
Shelly 1PM Mini Gen4
4.6(463)$27.99 - Smoke & CO Detectors
7% OFFSmoke Alarm
4.4(558)£64.82£69.74 - Temperature & Humidity Sensors
BLU H&T Display ZB
4.4(86)$25.99 - Temperature & Humidity Sensors
BLU H&T ZB
4.4(149)$22.99 - Temperature & Humidity Sensors
H&T Gen3
3.4(1.9K)$40.99 - Water Leak Sensors
Flood Gen4
4.1(319)$39.99 - Water Leak Sensors
Flood S Gen4
4.5(48)$27.99 - Water Leak Sensors
3% OFFFlood
3.8(182)€25.40€26.09