Sonoff Devices -- Honest Pros and Cons
Sonoff is one of the most popular DIY smart device brands, thanks to low prices and a huge range. But before you buy, it's worth understanding how it actually works -- including the eWeLink cloud and what it takes to get full local control.
How the Sonoff System Works
Device + Wi-Fi
Most Sonoff devices are direct Wi-Fi devices -- they connect straight to your home router, no extra bridge needed.
Control via eWeLink
By default you control the device through the eWeLink app -- remote access and most automations run through the eWeLink cloud over the internet.
Zigbee needs a bridge
Sonoff's Zigbee devices always require a separate Sonoff Zigbee bridge (hub) -- they do NOT connect directly to Wi-Fi.
Option: flash for local control
The community has documented a path to Tasmota or ESPHome firmware for many models -- once flashed, a device can run fully without the cloud. Always check the specific model first.
Pros and cons at a glance
The biggest DIY flashing community
Sonoff has become a community favorite precisely because so many models have a documented path to full local control -- though it's not guaranteed for every single one.
Low entry price
Sonoff relays, plugs, and switches usually cost less than many competitors -- a cheap way to start experimenting with automation.
Wide device selection
From plugs to in-wall switches and sensors, the Sonoff range covers most basic smart home needs.
Active flashing community
Tasmota and ESPHome community documentation for Sonoff devices is some of the most extensive out there -- help is available if you want local control.
eWeLink cloud dependency
To be honest -- by default, control and remote access run through the eWeLink cloud. That's not a flaw, it's an architecture choice worth knowing upfront.
Not every model can be flashed
Some newer or ITEAD-locked models resist flashing. Always check the specific model before buying if flashing matters to you.
What to actually check before buying
Five things to weigh when picking a specific Sonoff device
- {'t': 'Wi-Fi device + eWeLink', 'd': 'Most Sonoff devices connect directly to your home Wi-Fi and are controlled by default through the eWeLink app.'}
- {'t': 'Zigbee devices + bridge', 'd': "Choosing the Sonoff Zigbee line means budgeting for a separate Sonoff Zigbee bridge -- without it, the devices won't work."}
- {'t': 'In-wall switch = electrical work', 'd': "Installing a wall switch means working with your home's wiring -- if you're not confident, hire an electrician."}
- {'t': 'Flashing is possible, not guaranteed', 'd': 'Tasmota/ESPHome flashing is well documented for many models, but check whether your exact model supports it before you buy.'}
- {'t': 'Voice control depends on the device', 'd': 'Most work with Alexa and Google Assistant, and some newer ones support Matter -- but not all devices equally, so check the specific model.'}
Frequently asked questions
Do Sonoff devices work without internet?
Not fully by default -- the eWeLink app and remote control run through the cloud. You get full local operation without internet by flashing the device to Tasmota or ESPHome, but that depends on the specific model.
Can every Sonoff device be flashed to Tasmota or ESPHome?
No. Many Wi-Fi models have a well-documented community process, but some newer or ITEAD-locked models resist it. Always check the specific model before buying.
What's the difference between Sonoff Wi-Fi and Sonoff Zigbee devices?
Wi-Fi devices connect straight to your home router. Sonoff Zigbee devices always need a separate Sonoff Zigbee bridge -- they never connect directly to Wi-Fi.
Does Sonoff work with Alexa, Google Assistant, or Home Assistant?
Most devices work with Amazon Alexa and Google Assistant, depending on the specific device. Matter support exists on some newer devices, not all. Home Assistant works via the eWeLink integration, or locally after flashing.
Can I install an in-wall Sonoff switch myself?
Technically possible, but it's electrical work involving mains voltage. If you're not experienced, it's safer to hire an electrician than to risk it.
Not sure which Sonoff model fits your project?
Browse the devices in the shop or book a consultation -- we'll help you choose based on price and whether flashing matters to you.