Can Shelly work without internet or cloud?

Yes, fully. Every Shelly device has a built-in web server and supports REST API, MQTT and WebSocket without any cloud connection. Local control via the Shelly app, Home Assistant or a browser works entirely within the local network. For remote access without cloud, a VPN is the recommended solution.

Shelly

Q: Is the Shelly app free?

Yes. The Shelly app is free for iOS and Android, with no subscription and no feature limitations. The Shelly Cloud service is also free in the basic tier. All devices can be operated fully locally without creating a cloud account.

Q: Does Shelly work without a neutral wire?

Yes. The Shelly 1L Gen3 and 2L Gen3 are designed specifically for installations without a neutral wire. With the optional Shelly Bypass connected in parallel with the load, they work reliably even on LED circuits under 25 W.

Q: Which Shelly for roller blind and shutter control?

The Shelly 2PM is the standard choice for roller blinds and shutters. It offers two independent channels or a combined shutter channel with automatic end-stop detection, runtime calibration and position memory. It fits standard back-box installations and connects directly to the existing motor.

Q: Is Shelly future-proof?

Yes. The Gen4 platform supports Matter, the cross-manufacturer smart home standard backed by Apple, Google, Amazon and Samsung. All Shelly devices receive OTA firmware updates. Allterco Robotics is publicly listed and actively developing the Shelly product line.

Smart home, retrofitted. No compromise.

Shelly offers flush-mount modules, dimmers, energy meters and sensors for professional electrical installation — retrofit-ready for existing buildings, compatible with Wi-Fi, ZigBee, Matter and more.

Wi-Fi ZigBee Matter Bluetooth Z-Wave KNXnet/IP LAN

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Great advice and friendly service. I was helped immediately and competently with any questions. Gladly again.

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Office Manager from Frankfurt a.M.

Goods are well packaged and arrive safely, which is important to me. My mail was answered immediately.

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Master carpenter from Wiesbaden

Had to replace a lamp, but the same was no longer available. Great advice, found a suitable replacement and delivered it quickly.

Smart installation in three steps

STEP 01

Choose your device

STEP 02

Installed in 15 minutes

STEP 03

Control and automate

🔍

Pick the right Shelly module

Flush-mount or DIN rail, single or dual channel, with or without neutral wire. Browse the WATT24 range and find the right device for every installation scenario. Use the technology filters above to narrow down by Wi-Fi, ZigBee or Matter-certified products.

⚡

Behind the switch in 15 minutes

Switch off the circuit, disconnect the existing switch, fit the Shelly module into the standard back box, wire it up and close. No chasing, no new cabling, no special tools. Installation must be carried out by a qualified electrician — the workload stays manageable.

📱

Control, monitor, automate

Via the Shelly app, Home Assistant, ioBroker or directly through the REST API and MQTT. Fully local operation, no cloud dependency, no reliance on external servers. Schedules, scenes and triggers can be set up without any programming knowledge.

Shelly by application

Smart Lighting Dimmers, RGBW controllers, 0-10V for any lighting setup Energy Monitoring Single and three-phase metering, PV integration, load shedding Safety and Security Smoke detectors, flood sensors, door and window contacts Doors, Blinds and Shutters 2PM modules, cover controllers, end-stop detection Heating and Climate TRV thermostatic valves, room thermostats, underfloor heating

Who is behind Shelly?

Shelly is a brand of Allterco Robotics Ltd., an electronics company headquartered in Sofia, Bulgaria. Founded in 2015 and listed on the Bulgarian Stock Exchange, Allterco runs its own hardware and firmware development team.

Shelly at a glance

Manufacturer: Allterco Robotics Ltd., Sofia, Bulgaria (EU)
Founded 2015, publicly listed since 2018
Over 15 million devices sold worldwide
Gen4 platform with Matter, ZigBee, Wi-Fi and Bluetooth
Available in Germany through authorised B2B resellers including WATT24

All devices receive OTA firmware updates. New features are rolled out to older device generations as well. For stable long-term support in commercial environments, the Pro line is the safest choice: Pro devices are rated for continuous duty and receive prioritised support.

Shelly flush-mount modules: smart home retrofit without major works

Shelly's 1-series and 2-series flush-mount modules fit standard back boxes from 40 mm depth and work in parallel with existing switches and push buttons. No frame replacement, no chasing, no new wiring.

The most common planning mistake: ordering a module that requires a neutral wire for a location that only has live and earth. Before ordering, check whether L, N and PE are all present at the switch position. If there is no neutral, go for the 1L or 2L variant. For loads under 25 W (typical for LED), add the Shelly Bypass in parallel.

Shelly flush-mount: model overview

Shelly 1 / 1 Gen4: 1 channel, switching, neutral wire required
Shelly 1L Gen3: 1 channel, no neutral wire, ideal for older installations
Shelly 2PM Gen4: 2 channels or shutter control, with energy metering
Shelly Dimmer 0/1-10V: smooth dimming, compatible with electronic ballasts and DALI drivers
Shelly Mini series: compact form factor for shallow back boxes behind luminaires

Shelly roller blind and shutter control: the 2PM in practice

For roller blind and shutter automation, the Shelly 2PM is the go-to device. Two independent switching channels or a combined shutter channel with automatic end-stop detection, runtime calibration and position memory. The 2PM connects directly to the existing motor without any changes to the mechanical installation.

Schedules, sun-protection scenes and wind shutoff can be configured via the Shelly app, Home Assistant or ioBroker. The 2PM also monitors motor current, enabling software-based overload protection.

Shelly 3EM: professional three-phase energy metering

The Shelly Pro 3EM measures active power, reactive power and energy consumption across all three phases simultaneously, with ±1% accuracy. Data is available locally via REST and MQTT, and optionally through the Shelly Cloud. For high-current applications, external CT clamps up to 400 A are available.

Typical applications for the Shelly 3EM

PV systems: generation, self-consumption and grid import at a glance
Tenant metering: per-circuit billing for residential buildings
Commercial: peak load management and energy reporting
EV charging management: dynamic load control based on available grid capacity

For retrofitting into an existing distribution board: the supplied Rogowski coils or clip-on CT clamps wrap around the phase conductors without breaking the circuit, so installation is possible on live systems. Important: configure the phase assignment correctly in the web interface to avoid discrepancies in consumption and feed-in readings.

Shelly app and cloud: what's free, what's not?

The Shelly app is free for iOS and Android, with no subscription and no locked features. The Shelly Cloud is an optional service for remote access and multi-site device management, also free in the basic tier.

Anyone who prefers not to use the cloud can run all devices fully locally. REST API, MQTT and WebSocket are available without a cloud account. A VPN into the local network is all that's needed for remote access.

Tip: use the local web interface

Every Shelly device has a built-in web server accessible via its local IP address in any browser. Switch states, energy readings, schedules and network settings can all be configured directly, without the app and without cloud access. Particularly useful on site when you don't want to rely on mobile data.

Shelly compatibility: Home Assistant, FritzBox, ZigBee and more

Shelly communicates over open protocols and integrates into virtually any smart home infrastructure.

System / Platform	Compatible	Notes
Home Assistant	Native	Official integration, auto-discovery, fully local
ioBroker	Native	Shelly adapter available, actively maintained
FritzBox (AVM)	Yes	Via Home Assistant, Homebridge or an MQTT broker on the same network
Apple HomeKit	Yes (Matter)	Matter-certified devices directly, older devices via Homebridge
Philips Hue	Yes	Via Home Assistant or a shared Matter controller
ZigBee	Yes (Gen4)	Gen4 devices support ZigBee natively; Shelly Wave devices are Z-Wave
Amazon Alexa / Google Home	Yes	Via Shelly Cloud integration or Matter
KNX	Yes (KNXnet/IP)	Dedicated Shelly KNX devices, no gateway required

Is Shelly future-proof?

Shelly's Gen4 platform is built around Matter, the cross-manufacturer smart home standard backed by Apple, Google, Amazon and Samsung. Matter-certified Shelly devices work with any Matter controller without proprietary bridges or cloud services.

All Shelly devices support OTA updates. Allterco has a track record of shipping meaningful firmware updates to older hardware generations, not just new products. The active developer community around Home Assistant and ioBroker ensures integrations keep pace with new releases.

Buy Shelly at WATT24

As a B2B reseller, we supply Shelly products at net prices to electricians, electrical contractors and facility managers. For project quantities, pricing or technical questions, get in touch: Contact.

FAQ: Shelly smart home

Who makes Shelly?

Shelly is a brand of Allterco Robotics Ltd., headquartered in Sofia, Bulgaria. Founded in 2015 and publicly listed since 2018, Allterco runs its own hardware and firmware development team and has sold over 15 million devices worldwide.

What are the disadvantages of Shelly?

Shelly devices rely on a stable Wi-Fi network. In buildings with poor signal coverage, reliability can suffer. Remote access without cloud requires a VPN. Setting up complex automations requires basic familiarity with Home Assistant or ioBroker. Not all models support operation without a neutral wire, so model selection matters.

Is the Shelly app free?

Yes. The Shelly app is free for iOS and Android with no subscription and no feature limitations. The Shelly Cloud is also free in the basic tier. All devices can be operated fully locally without creating an account.

Can Shelly work without cloud or internet?

Yes, completely. Every Shelly device has a built-in web server with REST API, MQTT and WebSocket support that works without any cloud connection. Control via app, Home Assistant or browser runs entirely within the local network. For remote access without cloud, a VPN is the recommended approach.

Is Shelly compatible with Home Assistant?

Yes. Shelly has an official Home Assistant integration with auto-discovery. Devices appear automatically as native entities for switching, dimming, energy monitoring and scene control. Everything runs locally, no cloud required.

Does Shelly work without a neutral wire?

Yes. The Shelly 1L Gen3 and 2L Gen3 are specifically designed for installations without a neutral wire. With the optional Shelly Bypass in parallel with the load, they operate reliably on LED circuits under 25 W.

Which Shelly for roller blind and shutter control?

The Shelly 2PM is the standard choice: two independent channels or a combined shutter channel with automatic end-stop detection, runtime calibration and position memory. It fits standard back boxes and connects directly to the existing motor.

Is Shelly compatible with ZigBee?

Yes. Shelly Gen4 devices support ZigBee natively. Older devices can be integrated into existing ZigBee networks via a ZigBee-capable gateway and Home Assistant. WATT24 also stocks a wide range of ZigBee devices from other manufacturers.

What is the difference between Shelly 1 and Shelly 1L?

The Shelly 1 requires a neutral wire at the switch position. The Shelly 1L is designed for installations where only live and earth are available. Both switch a single circuit and fit into standard back boxes.

Which Shelly for energy metering?

For three-phase installations, the Shelly Pro 3EM measures active power, reactive power and energy on all three phases with ±1% accuracy. CT clamps up to 400 A are available for high-current applications. For single-phase circuits, the Shelly 1PM is the right choice. Both support MQTT and REST for integration into energy management systems.

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KATHRIN BRANDT

OMAR NASER

RAINER SEIDEL

Smart installation in three steps

Pick the right Shelly module

Behind the switch in 15 minutes

Control, monitor, automate

Shelly by application

Who is behind Shelly?

Shelly flush-mount modules: smart home retrofit without major works

Shelly roller blind and shutter control: the 2PM in practice

Shelly 3EM: professional three-phase energy metering

Shelly app and cloud: what's free, what's not?

Shelly compatibility: Home Assistant, FritzBox, ZigBee and more

Is Shelly future-proof?

FAQ: Shelly smart home

Your lightexpert

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Shelly

Filter

Filter

KATHRIN BRANDT

OMAR NASER

RAINER SEIDEL

Smart installation in three steps

Pick the right Shelly module

Behind the switch in 15 minutes

Control, monitor, automate

Shelly by application

Who is behind Shelly?

Shelly flush-mount modules: smart home retrofit without major works

Shelly roller blind and shutter control: the 2PM in practice

Shelly 3EM: professional three-phase energy metering

Shelly app and cloud: what's free, what's not?

Shelly compatibility: Home Assistant, FritzBox, ZigBee and more

Is Shelly future-proof?

FAQ: Shelly smart home