> For the complete documentation index, see [llms.txt](https://docs.wisej.com/migration/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wisej.com/migration/winforms-to-wisej-1/optimizations-after-migration/theming.md).

# Theming

Theming in Wisej.NET is a complex but very powerful feature that helps you to improve your UI/UX experience by a lot.

You can use the [Theme Builder](https://docs.wisej.com/theme-builder/) to create a custom Theme or Mixin and test it directly with the Live Preview on your application.