Pure-GPU HTML UI Engine
for Desktop and Games
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Interfaces at the Speed of Light

Ultralight is a tool to display fast, beautiful HTML interfaces inside all kinds of applications.

Save time and money by writing your application's front-end with HTML while still retaining access to the power and performance of native C/C++ code.

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Ultralight is only a fraction of the size and memory usage of other solutions and supports most modern HTML5 and JavaScript features (built upon same core as WebKit/Safari).


Ultralight takes advantage of native hardware acceleration to offer best-in-class rendering performance across all platforms.


Ultralight supports most major desktop PC platforms. Specifically, Windows (7+, x64), macOS (Sierra or later), and Linux (Ubuntu/Debian 9.5+, x64).

We're currently porting Ultralight to Xbox One and PS4, with plans to port it to Android, ARM, and others soon after.

Ultralight supports most major websites out of the box (it's a custom fork of WebKit) but is not yet at parity with Chrome/Safari. You can track which features are still in progress here.

We recommend trying out the Browser sample to get an idea of what Ultralight is capable of today.

Yes, most modern JavaScript frameworks work out of the box. Ultralight uses the same JavaScriptCore engine as WebKit/Safari.

Possibly, Ultralight renders everything to virtual GPU command lists which you'll need to dispatch to whatever graphics API your engine uses. See the game integration overview.

We're working on official bindings for other languages (C# is priority) and there are also several community-maintained bindings available as well for Go and Rust. In the meantime you can use the C API as a bridge for porting to other languages.

The WebCore and AppCore modules are available open-source on GitHub.

The UltralightCore and Ultralight modules are proprietary— source code access to these repos can be obtained through a custom license.

Our development roadmap for 1.2 is available here.

For a broader view of upcoming releases, you can view our milestone planning here.


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