What is Astro?
Astro is an open-source web framework focused on content-driven sites, using an islands architecture that renders most of the page to static HTML and hydrates interactive components (from React, Vue, Svelte and others) only where needed. In January 2026 the Astro Technology Company and its core team joined Cloudflare; the project remains MIT-licensed and open source, with community governance unchanged.
Read the full overview
Sources checked 27 September 2026: official website, documentation, Cloudflare announcement.
AstroDeveloper ToolsContent-focused web framework that ships zero JS by default
Key capabilities
- Islands architecture: Static HTML by default, with selective client-side hydration.
- Framework-agnostic components: Use React, Vue, Svelte or others together in one project.
- Content collections: Type-checked content handling for Markdown/MDX-based sites.
Since bundle-size and speed claims depend on how much interactivity a given page needs, measure output size and Core Web Vitals on a representative page rather than assuming a generic performance win.
“Content-focused web framework that ships zero JS by default”
Technical details
- Access
- See vendor
- Source model
- Open source
- Founded
- 2021
- Pricing model
- Open source
- API
- Not specified
- Website
- astro.build ↗
- GitHub
- Source repository ↗
What to verify
Start from the users, systems and operating responsibilities the tool needs to support.
- Confirm current features, licensing and support terms.
- Validate deployment, data location and access control.
- Test integrations, exports and recovery workflows.
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