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.

Hello, world!

Everyone likes to start with a simple program, so here is the obligatory "Hello, world!" program in Toit. Define your main function by writing its name, followed by a colon. The body of the function is indented by two spaces. The "print" function takes one argument - you don't need parentheses.

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  print "Hello, World!"

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.122 release

Add support for encoding.yaml.

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Toit v2.0.0-alpha.121 release

Print diagnostics on stderr when running programs. Report package warnings if they are local. Support bytemap drawing with padded lines of byte data. Fix rare case in zlib decompresser. Be more liberal in accepting DNS packets. Add stride argument to bitmap primitive.

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Toit v2.0.0-alpha.120 release

Add feature to hold pins during deep sleep. Move rare things out of core/util into system. Remove deprecated functionality. Fix missing Object methods on mixins and interfaces. Added support for querying the architecture of the Toit VM. Add conversion to and from UTF-16. Fix super call to mixins in named constructors.

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Toit v2.0.0-alpha.119 release

Catch some edge cases when comparing ints with floats. Use default native stack sizes in more places.

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Toit v2.0.0-alpha.118 release

Add support for weak maps. Add support for watchdog timers. Add an option to the uncompressed zlib encoder. Improve finalizer handling. Improve OOM message to include UUID of processes. Make Zlib RLE support configurable. Relax a restriction on font drawing on bitmaps. Fix -Werror behavior with packages. Fix off-by-one in bounds check of to-int.

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Toit v2.0.0-alpha.117 release

Enable SPIRAM on ESP32-S3. Fix Win32 build.

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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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