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In-wall relays comparisons

Hidden relay modules for making existing switches smarter without replacing every wall control.

Strongest overall pick

Shelly Plus 1

Shelly · HA: excellent · local: excellent

tiny form factor fits behind most light switches and junction boxes

Best local-control posture

Shelly · works offline: yes

Fully local control via HTTP API or MQTT. Cloud is optional and not needed for core relay functionality.

Easiest starting point

Zooz · setup: moderate

Z-Wave Home Assistant setups wanting a quality dimmer switch

Criteria	Shelly Plus 1	SONOFF ZBMINI-L2	Zooz ZEN72 800LR Dimmer Switch
Local control	excellent	excellent	excellent
Cloud dependency	low	none	none
Home Assistant fit	excellent	excellent	excellent
Works offline	yes	yes	yes
Setup difficulty	advanced	advanced	moderate
Needs extra hub / controller	no	yes	yes
Power / form factor	hardwired	hardwired	hardwired
Protocols	wifi, mqtt, bluetooth	zigbee	z-wave
Best for	Home Assistant users who want to smart-enable existing dumb switches	older homes without neutral wires at the switch box	Z-Wave Home Assistant setups wanting a quality dimmer switch

budget price band

Shelly · local control: excellent · cloud: low

Setup: advanced
Needs extra hub: no / self-contained
Standout: Tiny Wi-Fi relay with full local API — hides behind any existing switch plate.

budget price band

SONOFF · local control: excellent · cloud: none

Setup: advanced
Needs extra hub: yes
Standout: No neutral wire required — the key upgrade over the original ZBMINI for older wiring.

mid price band

Zooz · local control: excellent · cloud: none

Setup: moderate
Needs extra hub: yes
Standout: Z-Wave 800 Long Range with multi-tap scene control — local, reliable, and interference-free.