When Shelly beats Tasmota and when it does not
Shelly's stock firmware versus Tasmota for local-first Home Assistant setups—what each actually is, when each wins, and the myths to ignore.
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If you build local-first with Home Assistant, you’ll eventually weigh Shelly against Tasmota. It helps to be precise about what each one is. Shelly is a brand of Wi-Fi (and Bluetooth) relays, plugs, and sensors that ship with capable stock firmware exposing a documented local API. Tasmota is open-source firmware you flash onto ESP8266/ESP82xx and ESP32 devices. They overlap because many Shelly Gen1 devices could be reflashed with Tasmota—but that’s increasingly beside the point, because modern Shelly firmware is already local and good.
A myth to clear first: you cannot “flash Tasmota onto” a Philips Hue bulb or a SwitchBot Hub the way you’d flash an ESP plug. Tasmota only runs on ESP microcontrollers. Hue bulbs are Zigbee devices built around Zigbee SoCs; Tasmota cannot replace their firmware. (Tasmota can act as a Zigbee gateway on an ESP board with a separate Zigbee module, which is a different thing.) Some specific ESP32-based SwitchBot units, like the Plug Mini, have community OTA paths, but the Hub is not a generic flash target.
When Shelly wins: stock firmware that’s already local
Shelly’s biggest strength is that you get local control with zero flashing. Devices expose a local HTTP/RPC API and MQTT, and Home Assistant auto-discovers them through the built-in Shelly integration—no cloud required.
For a smart plug, the Shelly Plug S connects over Wi-Fi, reports energy locally, and pairs to Home Assistant out of the box. For inline relays, the Shelly Plus 1 Mini Gen3 and Shelly Plus 2PM are compact, well-supported, and feature-rich (the 2PM does per-channel power metering).
Be accurate about the radios: Shelly Plus and Pro (Gen2/Gen3) devices are Wi-Fi + Bluetooth only. They do not contain Zigbee or Z-Wave radios. Shelly’s newer Gen4 line has begun adding Zigbee on select models, but a Plus/Pro device will not join a Zigbee or Z-Wave mesh, and Shelly is not a Zigbee/Z-Wave “hub.” If you need those radios, use a real coordinator—a Zigbee stick like the ConBee III for Zigbee. For Z-Wave, use a dedicated controller such as the Z-Wave.Me RaZberry 7 Pro—alongside your Shelly devices, not through them.
When Tasmota wins: flexibility on cheap ESP hardware
Tasmota shines when you want to take generic or repurposed ESP hardware and make it fully local and MQTT-native. The Sonoff S31 is the classic target: it’s ESP8266-based, so you flash it, point it at your MQTT broker, and it’s cloud-free.
Check the chip before you buy, though, because “it’s a Sonoff” no longer means “it takes Tasmota.” Sonoff has moved several newer plugs off Espressif silicon: the Sonoff S40 Lite and its energy-monitoring S40 sibling run a Bouffalo Lab BL602 (a RISC-V Wi-Fi chip), which is why Tasmota’s device database files the S40 under unsupportable. ESPHome can’t run on it either — BL602 isn’t an Espressif part, and LibreTiny (the project that extends ESPHome to some non-Espressif chips) doesn’t cover it. To get an S40 local you use the eWeLink LAN path (the SonoffLAN custom integration drives stock firmware over your network) or the BL602-specific OpenBeken firmware. It’s the same trap as the Hue bulb above, just better disguised.
Tasmota gives granular control—custom MQTT topics, rules, templates, GPIO mapping—that’s ideal when you’re integrating odd hardware or building something bespoke. If you enjoy tinkering and want to standardize a pile of mixed ESP gear on one firmware, Tasmota is the tool.
What Tasmota is not is a way to “take over” non-ESP devices. Zigbee water sensors, Zigbee bulbs, and similar are joined to your Zigbee coordinator (via ZHA or Zigbee2MQTT), not flashed with Tasmota.
When to avoid Tasmota
The cost is effort and risk. Flashing requires the right tooling, sometimes physical disassembly and serial wiring, and a wrong move can brick a device. If you want appliances that just work, that overhead is a real downside. There’s also maintenance: you own the firmware lifecycle.
When to avoid Shelly
Shelly devices are Wi-Fi-first, which means every device is another node on your 2.4 GHz network—fine in small numbers, something to plan for at scale. They also tend to cost more per device than a bare Sonoff you flash yourself. And again: no Zigbee/Z-Wave on Plus/Pro, so they don’t help you build a sub-GHz or low-power mesh. There is no “Z-Wave 1000” tier to worry about—real Z-Wave silicon tops out at the 800 series today.
Quick verdict
Choose Shelly when you want reliable, already-local Wi-Fi devices with a clean Home Assistant integration and no flashing. Choose Tasmota when you want maximum control over cheap ESP hardware and don’t mind owning the firmware. Most local-first homes end up with both: Shelly for the easy wins, Tasmota for the projects—plus a proper Zigbee or Z-Wave coordinator for everything those Wi-Fi devices can’t do.