# Klayout (open-source CAD and 3D modelling app)

> Klayout is a free, open-source CAD and 3D modelling app for Windows and Linux. This repository will hold the main sources for the KLayout project. It has 1,219 GitHub stars and is released under the GPL-3.0 license. Its source code is on GitHub at KLayout/klayout.

This repository will hold the main sources for the KLayout project. Plugins can be included into the "plugins" directory from external sources.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/KLayout/klayout |
| Platforms | Linux, Windows |
| Interface | desktop GUI |
| GitHub stars | 1,219 |
| License | GPL-3.0 (open source) |
| Replaces | n/a |
| Language | C++ |
| Website | none listed |
| Official | no |
| Category | CAD & 3D modelling |
| Latest release | v0.30.12 (Aug 26, 2026) |
| Last commit | Oct 4, 2026 |

## Install

Download a build for your system from the project's releases (https://github.com/KLayout/klayout/releases) or website, or build it from source by following the README.

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