Gemini network users can build a site and log with Flounder, which provides a web interface for capsules.
Open UI
Open UI works on standards for building interoperable user interface components.
About Open UI
Open UI is a W3C Community Group working to allow web developers to style and extend built-in web controls such as select dropdowns, checkboxes, radio buttons, and date and color pickers. It works on specifications for component parts, states, behaviors, and accessibility requirements, along with test suites and polyfills for compatibility.
Its longer-term aim is to establish a standard process for developing UI controls for the web platform. Community participation is through Discord and GitHub, and its goals and process are described in its charter.
Key features
- Style and extend built-in controls like select, checkbox, radio
- Specify parts, states, and behaviors of built-in controls
- Define accessibility requirements for UI controls
- Provide test suites to check compatibility
- Implement polyfills for extensible web UI controls
- Coordinate community contributions via Discord and GitHub
Best for: Web developers and design system teams that work with built-in browser controls.
Good for
- Covers common controls such as select, checkbox, radio, and date/color pickers
- Includes accessibility requirements in control specifications
- Develops test suites and polyfills to support compatibility
Open UI at a glance
- Website
- open-ui.org
- Category
- Development › Web Development
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Open UI alternatives
Tools and sites you could use instead, ranked by how closely they match.
Magic UI provides React components and templates for building landing pages.
Replit builds working apps and websites from natural language descriptions, with no coding required to get started.
Free
9 alternatives
Radix UI provides accessible React components, icons, and colors for building user interfaces.
Paid
7 alternatives
Semantic UI provides a shared vocabulary and components for designers and developers building user interfaces.
Plate provides customizable plugins and components for building rich-text editors.
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Open UI FAQ
What is Open UI?
A W3C Community Group focused on styling and extending built-in web UI controls.
How can I contribute to Open UI?
Through community participation on Discord and GitHub.
Where is the outline of Open UI's goals and process?
In its full charter linked from the homepage.
Is something wrong or out of date?
Tell us and an editor will check it.
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