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Preview of Flag Theme Generator

Flag Theme Generator by 301.st

Generate accessible browser themes inspired by 198 country flags. Dark, Light & AMOLED modes with WCAG contrast validation. Export palettes to CSS, Tailwind, shadcn/ui, Tokens Studio, and JSON.

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Screenshots
Japan palette drawer showing 10 WCAG-validated design tokens with quality score and CSS exportCountry list with 20 flag palettes showing quality scores and mode compatibility badgesBrazil palette with WCAG contrast analysis — Dark mode 95.49/100, fidelity, headroom, and distinctness metricsSweden palette with export section showing CSS variables, Tailwind, JSON, shadcn/ui, and Tokens Studio tabsThree steps: pick a country, choose a mode, export design tokensPrivacy highlights: zero telemetry, fully local processing, open-source code on GitHub
About this extension
Create browser themes inspired by real country flags.

Flag Theme provides 198 national color palettes and lets you preview and apply themes directly in your browser using the browser.theme API.

Features
  • Dark / Light / AMOLED modes
  • WCAG-checked color contrast
  • Live preview — see the theme before applying
  • Side panel for quick browse and apply
  • Open source — Apache 2.0 licensed

Export for Designers & Developers

Open the side panel to export your theme in five formats:
  • CSS custom properties (--uc- prefix)
  • Tailwind config (uc namespace)
  • shadcn/ui HSL variables
  • Tokens Studio (W3C DTCG format)
  • Raw JSON with metadata

Privacy

All processing happens locally in your browser.
  • No network requests
  • No telemetry
  • No tracking
  • No account required

Permissions: storage only (for saving your preferences).



Website: flagtheme.com
Source code: GitHub
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Permissions and data

Optional permissions:

  • Download files and read and modify the browser’s download history

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
1.0.0
Size
156.89 KB
Last updated
4 days ago (Mar 9, 2026)
Version History
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