slint

Slint is a declarative GUI toolkit to build native user interfaces for Rust, C++, or JavaScript apps.

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Quick Overview

Slint is a declarative GUI toolkit for building native user interfaces for desktop and embedded applications. It allows developers to create UIs using a domain-specific language and supports multiple programming languages, including Rust, C++, and JavaScript.

Pros

Cross-platform support for desktop and embedded systems
Declarative syntax for easy and efficient UI development
Language-agnostic, supporting multiple programming languages
High performance and low resource usage

Cons

Relatively new project, still in active development
Limited community and ecosystem compared to more established GUI frameworks
Documentation may not be as comprehensive as more mature projects
Learning curve for developers unfamiliar with declarative UI design

Code Examples

Creating a simple window with a button:

export component MainWindow inherits Window {
    width: 300px;
    height: 200px;
    Text {
        text: "Hello, Slint!";
        font-size: 24px;
        y: parent.height / 3;
        horizontal-alignment: center;
    }
    Button {
        text: "Click me!";
        x: (parent.width - self.width) / 2;
        y: parent.height * 2/3;
    }
}

Handling user input:

export component Counter inherits Window {
    property <int> count: 0;
    VerticalLayout {
        Text { text: "Count: \{count}"; }
        Button {
            text: "Increment";
            clicked => { count += 1; }
        }
    }
}

Using states for dynamic UI changes:

export component ToggleButton inherits Rectangle {
    property <bool> checked;
    background: checked ? #00ff00 : #ff0000;
    Text {
        text: checked ? "ON" : "OFF";
    }
    clicked => { checked = !checked; }
}

Getting Started

To start using Slint, follow these steps:

Install Slint CLI:
```
cargo install slint-cli
```
Create a new Slint project:
```
slint init my-project
cd my-project
```
Build and run your project:
```
cargo run
```

For more detailed instructions and language-specific setup, refer to the official Slint documentation at https://slint-ui.com/docs/getting_started.html.

Competitor Comparisons

tauri

83,441

Build smaller, faster, and more secure desktop and mobile applications with a web frontend.

Pros of Tauri

Supports multiple programming languages (JavaScript, TypeScript, Rust) for app development
Offers a smaller app size and better performance due to native system components
Has a larger community and ecosystem, with more resources and third-party plugins

Cons of Tauri

Requires more setup and configuration compared to Slint's simpler approach
May have a steeper learning curve for developers new to Rust or native app development
Less control over the UI rendering, as it relies on web technologies for the frontend

Code Comparison

Tauri (JavaScript):

import { invoke } from '@tauri-apps/api/tauri'

async function greet() {
  const response = await invoke('greet', { name: 'World' })
  console.log(response)
}

Slint (Rust):

slint::slint! {
    export component HelloWorld {
        Text {
            text: "Hello, World!";
        }
    }
}

fn main() {
    HelloWorld::new().run().unwrap();
}

iced

24,482

A cross-platform GUI library for Rust, inspired by Elm

Pros of iced

More mature and widely adopted in the Rust community
Extensive documentation and examples available
Supports a wider range of widgets out-of-the-box

Cons of iced

Steeper learning curve for beginners
Less flexible styling options compared to Slint
Slower compilation times due to heavy use of generics

Code Comparison

iced:

use iced::{button, Button, Column, Element, Sandbox, Settings, Text};

struct Counter {
    value: i32,
    increment_button: button::State,
    decrement_button: button::State,
}

Slint:

slint::slint! {
    export component Counter {
        property<int> value;
        Button { text: "+"; clicked => { root.value += 1; } }
        Button { text: "-"; clicked => { root.value -= 1; } }
    }
}

Both iced and Slint are Rust GUI frameworks, but they differ in their approach. iced focuses on a pure Rust implementation with a more traditional API, while Slint uses a custom markup language for UI design and integrates with Rust for logic. iced offers more built-in widgets and has a larger community, but Slint provides a more declarative and potentially more intuitive approach to UI design, especially for those familiar with web technologies.

egui

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egui: an easy-to-use immediate mode GUI in Rust that runs on both web and native

Pros of egui

Immediate mode GUI, offering simplicity and flexibility
Lightweight and fast, with minimal dependencies
Strong focus on ease of use and quick prototyping

Cons of egui

Limited built-in widgets compared to retained mode GUIs
Less suitable for complex, stateful applications
Lacks native look-and-feel across different platforms

Code Comparison

egui:

ui.heading("My egui Application");
ui.horizontal(|ui| {
    if ui.button("Click me").clicked() {
        println!("Button clicked!");
    }
});

Slint:

import { Button, VerticalBox } from "std-widgets.slint";

export component MyApp {
    VerticalBox {
        Text { text: "My Slint Application"; }
        Button { text: "Click me"; clicked => { debug("Button clicked!"); } }
    }
}

Key Differences

egui uses immediate mode rendering, while Slint uses retained mode
Slint provides a declarative UI description language, egui uses Rust code directly
egui is more lightweight and suitable for quick prototypes, while Slint offers more complex UI capabilities
Slint has better support for native look-and-feel across platforms
egui is generally easier to integrate into existing Rust projects

fltk-rs

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Rust bindings for the FLTK GUI library.

Pros of fltk-rs

Mature and stable library with a long history
Lightweight and fast, with minimal dependencies
Cross-platform support for desktop environments

Cons of fltk-rs

Less modern UI aesthetics compared to Slint
Limited support for mobile platforms
Steeper learning curve for Rust beginners

Code Comparison

fltk-rs

use fltk::{app, button::Button, frame::Frame, prelude::*, window::Window};

fn main() {
    let app = app::App::default();
    let mut wind = Window::new(100, 100, 400, 300, "Hello from fltk-rs");
    let mut frame = Frame::new(0, 0, 400, 200, "");
    let mut but = Button::new(160, 210, 80, 40, "Click me!");
    wind.end();
    wind.show();
    but.set_callback(move |_| frame.set_label("Hello World!"));
    app.run().unwrap();
}

Slint

slint::slint! {
    export component App {
        Text {
            text: root.message;
        }
        Button {
            text: "Click me!";
            clicked => { root.message = "Hello World!"; }
        }
        property <string> message: "Hello from Slint";
    }
}

fn main() {
    let app = App::new().unwrap();
    app.run().unwrap();
}

druid

9,491

A data-first Rust-native UI design toolkit.

Pros of Druid

More mature project with a larger community and ecosystem
Supports multiple backends (GTK, Windows, macOS, Web)
Offers a rich set of built-in widgets and layout options

Cons of Druid

Steeper learning curve due to more complex API
Slower development and release cycle
Less focus on declarative UI design

Code Comparison

Druid example:

use druid::widget::{Button, Flex, Label};
use druid::{AppLauncher, Data, Lens, Widget, WindowDesc};

fn main() {
    let main_window = WindowDesc::new(ui_builder());
    AppLauncher::with_window(main_window).launch(0).expect("Failed to launch application");
}

Slint example:

slint::slint! {
    export component MainWindow inherits Window {
        Text {
            text: "Hello, World!";
        }
    }
}

fn main() {
    MainWindow::new().unwrap().run().unwrap();
}

Druid offers a more programmatic approach, while Slint focuses on a declarative UI design using a custom markup language. Slint's syntax is more concise and easier to read for UI-specific code, but Druid provides more flexibility for complex layouts and interactions.

yew

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Rust / Wasm framework for creating reliable and efficient web applications

Pros of Yew

Larger community and ecosystem, with more resources and third-party libraries
Better suited for complex web applications with dynamic content
Supports server-side rendering, improving initial load times and SEO

Cons of Yew

Steeper learning curve, especially for developers new to Rust
Larger bundle sizes compared to more lightweight alternatives
Performance may be slower for simple, static UIs

Code Comparison

Yew:

use yew::prelude::*;

#[function_component(App)]
fn app() -> Html {
    html! {
        <div>{"Hello, World!"}</div>
    }
}

Slint:

slint::slint! {
    export component App {
        Text {
            text: "Hello, World!";
        }
    }
}

Summary

Yew is a more comprehensive framework for building complex web applications in Rust, offering a larger ecosystem and features like server-side rendering. However, it comes with a steeper learning curve and potentially larger bundle sizes. Slint, on the other hand, is more focused on creating native desktop applications with a simpler API, making it easier to learn but potentially less suitable for complex web projects. The code comparison shows that Yew uses a more React-like syntax, while Slint employs a custom DSL for defining UI components.

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README

Slint is a declarative GUI toolkit to build native user interfaces for embedded, desktop, and mobile applications written in Rust, C++, JavaScript, or Python.

The name Slint is derived from our design goals:

Scalable: Slint should support responsive UI design, allow cross-platform usage across operating systems and processor architectures and support multiple programming languages.
Lightweight: Slint should require minimal resources, in terms of memory and processing power, and yet deliver a smooth, smartphone-like user experience on any device.
Intuitive: Designers and developers should feel productive while enjoying the GUI design and development process. The design creation tools should be intuitive to use for the designers. Similarly for the developers, the APIs should be consistent and easy to use, no matter which programming language they choose.
Native: GUI built with Slint should match the end users' expectations of a native application irrespective of the platform - desktop, mobile, web or embedded system. The UI design should be compiled to machine code and provide flexibility that only a native application can offer: Access full operating system APIs, utilize all CPU and GPU cores, connect to any peripheral.

We invite you to use Slint and be part of its community.

Visit #MadeWithSlint to view some of the projects using Slint and join us in the Slint community.

Current Status

Slint is in active development. The state of support for each platform is as follows:

Embedded: Ready. Slint is being used by customers in production on embedded devices running embedded Linux and Windows. The Slint run-time requires less than 300KiB of RAM and can run on different processor architectures such as ARM Cortex M, ESP32, STM32 from the MCU category to ARM Cortex A, Intel x86 from the MPU category.
Desktop: In Progress. While Slint is a good fit on Windows, Linux and Mac, we are working on improving the platform support in subsequent releases.
Web: In Progress. Slint apps can be compiled to WebAssembly and can run in a web browser. As there are many other web frameworks, the web platform is not one of our primary target platforms. The web support is currently limited to demo purposes.
Mobile
- Android: In Progress. Track the progress of work here https://github.com/slint-ui/slint/issues/46.
- iOS: Todo. Support for iOS will commence after the initial support for Android is completed.

Accessibility

Slint supports keyboard based navigation of many widgets, and user interfaces are scalable. The basic infrastructure for assistive technology like screen readers is in place. We're aware that more work is needed to get best-of-class support for users with special needs.

Demos

Embedded

RaspberryPi	STM32	RP2040
Video of Slint on Raspberry Pi	Video of Slint on STM32	Video of Slint on RP2040

Desktop

Windows	macOS	Linux

Web using WebAssembly

Printer Demo	Slide Puzzle	Energy Monitor	Widget Gallery	Weather demo

More examples and demos in the examples folder

Get Started

Hello World

The UI is defined in a Domain Specific Language that is declarative, easy to use, intuitive, and provides a powerful way to describe graphical elements, their placement, their hierarchy, property bindings, and the flow of data through the different states.

Here's the obligatory "Hello World":

export component HelloWorld inherits Window {
    width: 400px;
    height: 400px;

    Text {
       y: parent.width / 2;
       x: parent.x + 200px;
       text: "Hello, world";
       color: blue;
    }
}

Documentation

For more details, check out the Slint Language Documentation.

The examples folder contains examples and demos, showing how to use the Slint markup language and how to interact with a Slint user interface from supported programming languages.

The docs folder contains a lot more information, including build instructions, and internal developer docs.

Refer to the README of each language directory in the api folder:

Architecture

An application is composed of the business logic written in Rust, C++, or JavaScript and the .slint user interface design markup, which is compiled to native code.

Architecture Overview

Compiler

The .slint files are compiled ahead of time. The expressions in the .slint are pure functions that the compiler can optimize. For example, the compiler could choose to "inline" properties and remove those that are constant or unchanged. In the future we hope to improve rendering time on low end devices by pre-processing images and text. The compiler could determine that a Text or an Image element is always on top of another Image in the same location. Consequently both elements could be rendered ahead of time into a single element, thus cutting down on rendering time.

The compiler uses the typical compiler phases of lexing, parsing, optimization, and finally code generation. It provides different back-ends for code generation in the target language. The C++ code generator produces a C++ header file, the Rust generator produces Rust code, and so on. An interpreter for dynamic languages is also included.

Runtime

The runtime library consists of an engine that supports properties declared in the .slint language. Components with their elements, items, and properties are laid out in a single memory region, to reduce memory allocations.

Rendering backends and styles are configurable at compile time:

The femtovg renderer uses OpenGL ES 2.0 for rendering.
The skia renderer uses Skia for rendering.
The software renderer uses the CPU with no additional dependencies.

NOTE: When Qt is installed on the system, the qt style becomes available, using Qt's QStyle to achieve native looking widgets.

Tooling

We have a few tools to help with the development of .slint files:

A LSP Server that adds features like auto-complete and live preview of the .slint files to many editors.
It is bundled in a Visual Studio Code Extension available from the market place.
A slint-viewer tool which displays the .slint files. The --auto-reload argument makes it easy to preview your UI while you are working on it (when using the LSP preview is not possible).
SlintPad, an online editor to try out .slint syntax without installing anything (sources).
An updater to convert the .slint files from previous versions to newer versions.
An experimental Figma importer.

Please check our Editors README for tips on how to configure your favorite editor to work well with Slint.

License

You can use Slint under any of the following licenses, at your choice:

Build proprietary desktop, mobile, or web applications for free with the Community License,
Build open source embedded, desktop, mobile, or web applications for free with the GNU GPLv3,
Build proprietary embedded, desktop, mobile, or web applications with the Paid license.

See the Slint licensing options on the website and the Licensing FAQ.

Contributions

We welcome your contributions: in the form of code, bug reports or feedback.

If you see an RFC tag on an issue, feel free to chime in.
For contribution guidelines see CONTRIBUTING.md.

Frequently Asked Questions

Please see our separate FAQ.

About us (SixtyFPS GmbH)

We are passionate about software - API design, cross-platform software development and user interface components. Our aim is to make developing user interfaces fun for everyone: from Python, JavaScript, C++, or Rust developers all the way to UI/UX designers. We believe that software grows organically and keeping it open source is the best way to sustain that growth. Our team members are located remotely in Germany.

Stay up to date

Follow @slint-ui on X/Twitter.
Follow @slint@fosstodon.org on Mastodon.
Follow @slint-ui on LinkedIn.

Contact us

Feel free to join Github discussions for general chat or questions. Use Github issues to report public suggestions or bugs.

We chat in our Mattermost instance where you are welcome to listen in or ask your questions.

You can of course also contact us privately via email to info@slint.dev.

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