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Fluent UI Theme Designer

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What Fluent UI Theme Designer is

Fluent UI Theme Designer is a free web tool for creating themes from selected primary, text, and background colors. Its controls let you adjust Fluent UI palette slots, while a preview renders sample components with the generated theme. An accessibility checker is included. The designer uses Fluent UI ThemeGenerator to produce a theme and expose its result as JSON; it can also export a customized theme as PowerShell code. The exported palette can be added to SharePoint with Add-SPOTheme and applied to a site. Microsoft describes the generator as a way to create custom themes for SharePoint sites, and Microsoft Q&A provides guidance on using the designer and applying themes. The source code is in Microsoft’s public fluentui GitHub repository. This is a web-based, open-source project. It generates palettes from chosen colors, but does not extract colors from images or offer saved palettes or a brand color library.

Who it suits

It suits people creating color themes for Fluent UI or SharePoint sites, especially those who want to check accessibility and export a theme. SharePoint users can apply an exported palette through Add-SPOTheme.

What it does well

  • Edits primary, text, and background colors.
  • Previews sample components using the generated theme.
  • Includes an accessibility checker.
  • Exports themes as JSON and PowerShell code.

What to know first

  • Does not extract colors from images.
  • Does not save palettes.
  • No brand color library is listed.

Verdict

Fluent UI Theme Designer focuses on generating and previewing themes, with accessibility checks and code-oriented exports. Its listed workflow does not include image extraction or palette libraries.

Facts from Fluent UI Theme Designer's own pages

Accessibility
The designer includes an accessibility checker for the generated theme. · github.com, 9 Oct 2026
Color controls
The designer interface includes controls for primary, text, and background colors. · github.com, 8 Oct 2026
Color inputs
The app provides controls for changing the primary, text, and background colors. · learn.microsoft.com, 9 Oct 2026
Export
The designer can export a customized theme as PowerShell code. · learn.microsoft.com, 9 Oct 2026
Intended audience
Microsoft describes the theme generator as a way to create a custom theme for SharePoint sites. · learn.microsoft.com, 9 Oct 2026
Maker founded
Microsoft was founded in 1975. · news.microsoft.com, 9 Oct 2026
Maker headquarters
Microsoft’s global headquarters are in Redmond, Washington. · microsoft.com, 9 Oct 2026
Maker repository
The source code is in the public microsoft/fluentui GitHub repository. · github.com, 8 Oct 2026
Palette editing
The interface allows editing Fluent UI palette slots. · github.com, 8 Oct 2026
Purpose
The designer lets users create a custom color ramp for a SharePoint site theme. · learn.microsoft.com, 9 Oct 2026
SharePoint integration
The exported palette can be added to SharePoint with Add-SPOTheme and applied to a site. · learn.microsoft.com, 9 Oct 2026
Support
Microsoft Q&A provides guidance for using the designer and applying its themes to SharePoint. · learn.microsoft.com, 9 Oct 2026
Theme generation
The code uses Fluent UI ThemeGenerator to create a theme from selected colors and expose the result as JSON. · github.com, 8 Oct 2026
Theme palette
The app generates theme palette values from the selected colors. · github.com, 9 Oct 2026
Theme preview
The designer displays sample UI components using the selected theme colors. · github.com, 9 Oct 2026

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