When Shelly beats Tasmota and when it does not

Shelly’s stock firmware and Tasmota get compared as if they were the same kind of thing, and they are not. 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.

Choose Shelly when you want 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, plus a proper Zigbee or Z-Wave coordinator for everything those Wi-Fi devices can’t do.

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 devices expose a local HTTP/RPC API and MQTT, and Home Assistant auto-discovers them through the built-in Shelly integration - no cloud required and nothing to flash. I run a fair amount of Shelly gear here, including a Plus Wall Dimmer and the Wave 1PM relays.

For a smart plug, the Shelly Plug US Gen4 connects over Wi-Fi, reports energy locally, and pairs to Home Assistant out of the box; the similarly named Plug S is the European Type-F model and will not fit a US outlet. For inline relays, the Shelly 1 Mini Gen3 and the Shelly Plus 2PM are compact, well-supported, and feature-rich (the 2PM does per-channel power metering) - though the Plus 2PM is discontinued, so buy the Shelly 2PM Gen4 in its place. See my best local in-wall relays roundup for more.

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, and that is a firmware choice rather than a second radio running next to Wi-Fi: the Plug US Gen4 ships Matter-certified firmware by default and moves to Zigbee firmware when you press the device button five times in quick succession, so it joins one network or the other, never both at once. 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 (compare picks in the best Zigbee coordinators for Home Assistant). 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

Take generic or repurposed ESP hardware, flash Tasmota, and it becomes fully local and MQTT-native. Deciding between brands? See Shelly vs Sonoff for relays. 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.