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Slint is a toolkit to efficiently develop fluid graphical user interfaces for any display: embedded devices and desktop applications. We support multiple programming languages, such as Rust, C++, and JavaScript.

Our design goals are:

Getting Started

Choose one of our language integrations to get started with Slint:

For the best programming experience we recommend installing our Visual Studio Code extension.


Try one of our demos in the browser, cross-compiled to WebAssembly:

Video of the Slint printer demo running on a STM32H7 MCU:


You are free to use Slint under either an open source license or a commercial license. We also offer a completely free-of-charge commercial license under the Ambassador Program.

The commercial license gives you the perpetual right to use Slint to develop applications and includes standard support.

Regardless of the license you choose, open source or commercial, you can buy premium support in blocks of 10 hours.

For more details on the commercial license, refer to the Slint software license agreement and the licensing FAQs.

Open Source (GPLv3)


For open source applications




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30 hours Premium Support

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Rust Foundation logo

The Rust Foundation is an independent non-profit organization dedicated to stewarding the Rust programming language and developing the project.

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Crossware company logo

Crossware provides cross platform UI, IoT, and multimedia Software Solutions (Linux, MCU’s, Android).

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Cynetis Embedded company logo

Cynetis offers complete solutions for the development of embedded software and real-time applications on microcontroller.

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KDAB company logo

The KDAB Group provides leading software expertise across modern embedded, desktop and mobile platforms.

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Spyrosoft company logo

Spyrosoft is an awarded software & technology group with over 1 000 employees across 13 sites in 7 countries.

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The Quantative Consulting & Solutions company logo

TQCS deliver professional services and solutions to make the finest embedded system for customers from industrial, medical, defence and automotive industries.

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About Us

Photo of Olivier Goffart
Olivier Goffart
Photo of Simon Hausmann
Simon Hausmann
Photo of Aurindam Jana
Aurindam Jana
Photo of Tobias Hunger
Tobias Hunger
Software Engineer
Photo of Florian Blasius
Florian Blasius
Software Engineer

Olivier and Simon met while working together in a small company in Norway called Trolltech, on the Qt C++ toolkit. Here, they gained valuable experience in API design, cross-platform software development and user interface components.

Simon continued in the Qt Company as a lead developer and maintainer of the QtQml engine, while Olivier co-founded Woboq, a software consulting company.

Years later, in 2020, they started the SixtyFPS project and company in Berlin. The SixtyFPS project has been renamed to Slint, and the company has been growing.

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Questions? Check out our Frequently Asked Questions


Rust and C++ Interoperability

November 11, 2022

In this blog post, I want to explore both directions of integration between Rust and C++ and present some tools we use in Slint.

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Upcoming Changes to the Slint Language

November 4, 2022

In the past year we've added various small features to the language, while maintaining stability and backwards compatibility. Meanwhile, we've collected feedback from our users and gained experience by implementing some designs ourselves. We gathered various ideas to improve the language itself and we think that now is a good time to implement these: Since we're still at version 0.x and need to make these changes before we reach version 1.0.

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