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Ultralight makes it easy for C/C++ developers to seamlessly integrate web-content into games and desktop apps.

Use our lightweight, high-performance renderer to display HTML/JS/CSS on a variety of platforms and hardware targets.

1. ⚡ Modern HTML/JS/CSS Support:

Based on WebKit, Ultralight enjoys many of the same cutting-edge web features as Apple's Safari browser, simplifying development and reducing production costs.

2. ✨ Powerful and Lightweight:

Thanks to its highly-customizable CPU and GPU renderers, Ultralight offers developers unprecedented control over performance and memory usage-- making it the go-to choice for users who demand speed in constrained environments.

3. 🧩 Cross-Platform Compatibility:

With support for Windows, macOS, Linux, Xbox, PS4, and PS5 (and ARM64 coming in 1.4), Ultralight ensures your content displays smoothly and consistently on a wide range of platforms and hardware targets.

4. 🔁 Deep C/C++ and JavaScript Integration:

Ultralight facilitates seamless C/C++ and JavaScript integration through direct access to the JavaScriptCore API. Expose native state to web pages, extend JavaScript classes, define C/C++ callbacks, and more.

5. 🔧 Low-Level Customization:

Ultralight allows developers the ability to override platform-specific functionality-- granting control over such things as file-system access, clipboard management, font loading, and more to suit the unique needs of each target environment.

Developed in collaboration with top AAA game studios, Ultralight is engineered to display high-performance web-content across a diverse set of hardware targets and game engine environments.

Choose between our CPU renderer for fast, reliable rendering or our customizable GPU renderer for unparalleled animation performance.

→ Learn more by visiting our Game Integration Guide.

Get the best of both worlds-- save time by building your front-end with HTML/CSS/JS while retaining the power and performance of C/C++.

Embed the renderer directly within your existing run loop or leverage our AppCore framework to do all the heavy lifting for you, offering convenient native window management and accelerated rendering.

→ Learn more by visiting our Desktop App Guide.

Ultralight is a platform-agnostic port of WebKit for games and desktop apps.

Portions of the library are open-source, here's how the library is laid out:

We offer two different renderers for integration into a variety of target environments.

It's easy to license Ultralight in projects big and small.

You can get the latest SDK for each platform below (contact us for Xbox, PS4, and PS5):

• Windows | x64
• Linux | x64
• macOS | x64

Pre-built binares are uploaded to the following S3 buckets every commit:

• Archived Binaries: https://ultralight-sdk.sfo2.cdn.digitaloceanspaces.com/

To build the samples in this repo, please follow the instructions here.