A content-first islands framework versus a full-stack Svelte app framework — pick based on whether the deliverable is a site or an app.
Pick Astro when the deliverable is content-heavy — marketing pages, docs, blogs — and you want zero JS by default with islands only where they earn it. Pick SvelteKit when you're building an actual app with routing, server endpoints, and stateful UI, and you want Svelte all the way down rather than mixing in component frameworks.
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| Attribute | SvelteKit | Astro |
|---|---|---|
| Category | Frontend Framework | Frontend Framework |
| Pricing Model | open-source | open-source |
| Starting Price | Free | Free |
| Free Tier | Yes | Yes |
| Open Source | Yes | Yes |
| Platforms | — | web |