Toit is a modern high-level language designed specifically for microcontrollers

Toit is optimised for live reloading on your microcontroller. Your code runs incrementally as you write it and you get instant feedback. Push changes over your local WiFi in two seconds and reserve your USB cable for charging your phone. You iterate quickly, learn fast, and build better things.

Defining functions

What if you want to say "Hello" a lot without getting your fingers all tired? You should define a function. Calling a function in Toit is as simple as mentioning its name. If the function doesn’t take arguments that’s all you need.

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  print "Hello World!"

greet name:
  print "Hello $name!"

  greet "Kasper"

Toit + Jaguar = 🥳

Jaguar is a small application developed by the Toit team, that runs on your ESP32. It enables live reloading and lets you update and restart your ESP32 code over WiFi.


Update your code and restart your ESP32 conveniently over WiFi. No need to flash over serial, reboot your device, or wait for it to reconnect to your network.


Change your code in your editor, update it on your device, and restart it all within seconds.


Updates contain compiled Toit programs that are relocated and installed in flash on the device. Old versions are stopped and their resources are freed automatically.

No ESP32?

The Toit language can also be used on the desktop. In fact, we use it to develop many of the tools that come with the SDK.

Get started

Follow this easy step-by-step guide to get up and running with Toit.


Download and get started with the latest version of Toit.


Learn how to code with Toit and how you can use it in your IoT projects.

Latest news

Toit v2.0.0-alpha.84 release

Fix incorrect calculation of max stack height when shrinking. Improve validation of flash allocations. Add '--on_error' to uuid.parse. Add Set.to_list.

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Toit v2.0.0-alpha.83 release

Add missing field store type checks. Add support for changing the ESPNow rate. Fix BLE characteristics for notify and indicate.

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Toit v2.0.0-alpha.82 release

Add firmware.uri. Retry WiFi connect on handshake timeouts. Support --no-writable. Support esptool in path.

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Toit v2.0.0-alpha.81 release

Enable errors on RPC requests to non-existing processes. Respect current task deadline in catch. Harden task entry code. Schedule external allocation based GCs before waiting.

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Toit v2.0.0-alpha.80 release

Make ChaCha20/Poly1305 support optional. Remove 'stat' work-around for older glibc. Recognize OOM errors from TLS more reliably. Fix neutering of traces by sending them back. Better SPI RAM support in UART driver. Make tools/firmware 10x faster. Remove old service API.

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Toit v2.0.0-alpha.79 release

Implement support for TLS session resume. Add return type to uuid.parse and add uuid.Uuid.to_string. Make sure to only rely on IRAM code from UART ISR.

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Writing a driver in Toit

Just a few lines of Toit code are needed to reap the full benefits of the Toit ecosystem — without having to rely on firmware developers.

Choosing Toit for your IoT project means that your ESP32-based devices become as easy to program as smartphones: develop your app, deploy it to the devices of your choice, and then update and reinstall as often as needed, even on a shaky connection — all that while the other apps on the device keep running. Welcome to the 21st century, IoT!

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Toit meets Visual Studio Code

The extension allows VSCode to provide a rich view of your programs as well as easy access to common functionality like running and deploying apps.

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