Tasmota is free, open-source firmware for ESP8266 and ESP32 smart devices with full local control. See features, pros, cons, and FAQs.
Category
Internet of Things (IoT) & Home Automation
Pricing
free/open-source, from Free
Verified
Not yet
Last updated
July 19, 2026
Founded
2016
APIOpen SourceSelf-Hosted
What Is Tasmota
Tasmota is open-source firmware for ESP8266 and ESP32 based smart devices, created by Theo Arends beginning in January 2016. It was originally built to replace the stock cloud-dependent firmware on Sonoff smart plugs and switches with a version that runs entirely on the local network.
Today Tasmota supports thousands of devices from many manufacturers, including switches, sensors, lighting, and curtain motors, and is maintained by an active open-source community on GitHub rather than a company.
Key Features
Tasmota devices can be controlled and configured through a built-in web UI, MQTT, HTTP, Serial, or KNX, without any dependency on a manufacturer's cloud service. Automation is handled through built-in timers and rules or more advanced Berry scripting.
The firmware integrates with popular home automation hubs such as Home Assistant and openHAB, and can typically be installed using the browser-based Tasmota WebInstaller without needing to open the device.
Pricing
Tasmota is completely free and open source, with no licensing fees, subscriptions, or paid tiers. It is distributed and maintained purely through community contribution.
Key Features
Local-Only Control — Operate devices entirely over the local network without any cloud dependency.
Broad Device Support — Configuration templates for thousands of ESP8266 and ESP32 based devices.
Multiple Protocols — Control devices via web UI, MQTT, HTTP, Serial, or KNX.
Automation Rules and Timers — Built-in rule engine plus Berry scripting for custom automation logic.
Over-the-Air Updates — Flash and update firmware without physical access after initial setup.
Home Automation Integrations — Works with Home Assistant, openHAB, and other MQTT-based hubs.
Web-Based Installer — Flash firmware directly from a browser using the Tasmota WebInstaller.
Active Open-Source Community — Frequent releases and community-contributed device templates.
Pros & Cons
Pros
Completely free, open-source, no subscription or cloud account required
Keeps smart home devices working without an internet connection
Supports thousands of ESP8266 and ESP32 based devices out of the box
Deep automation via built-in rules and Berry scripting
Large, active community with frequent updates and device templates
Cons
Requires flashing firmware, which carries some technical risk
Some manufacturers lock devices, making flashing difficult or voiding warranties
No official customer support channel, only community-based support
User interface is functional but less polished than commercial smart home apps
Not every device or sensor on the market is supported
Pricing
Tasmota Firmware Free N/A
Frequently Asked Questions
Is Tasmota free?
Yes, Tasmota is completely free, open-source firmware.
What hardware does Tasmota support?
ESP8266, ESP32, ESP32-S, and ESP32-C3 based smart devices, with templates for thousands of specific products.
Do I need the cloud to use Tasmota?
No, Tasmota is designed for entirely local control over MQTT, HTTP, Serial, or a local web UI.
How do I install Tasmota on a device?
Most users flash devices using the browser-based Tasmota WebInstaller or a tool such as Tasmotizer.
Does Tasmota work with Home Assistant?
Yes, Tasmota integrates with Home Assistant and other MQTT-based home automation platforms.
Who created Tasmota?
Tasmota was created by Theo Arends, starting in January 2016 as a fork of Sonoff's stock firmware.
Is flashing Tasmota reversible?
In most cases devices can be reflashed back to stock firmware, though this varies by device and is not guaranteed.
How is Tasmota different from ESPHome?
Both are open-source alternative firmware projects for ESP chips; Tasmota emphasizes a built-in web UI and rule engine, while ESPHome emphasizes YAML-based configuration tightly integrated with Home Assistant.