Astro vs SvelteKit：2026 年哪個更好？
零 JS 內容框架遇上編譯器優先的全棧框架
Choose Astro if you are building a content site and want zero JavaScript by default. Choose SvelteKit if you need a full-stack application framework with client-side routing, form actions, and the smallest possible runtime.
Astro
The web framework for content-driven websites
SvelteKit
Web development, streamlined
Feature Comparison
| Feature | Astro | SvelteKit |
|---|---|---|
| SSG | ✓ | ✓ |
| SSR | ✓ | ✓ |
| Compiler | ✗ | ✓ |
| Streaming | ✓ | ✓ |
| API routes | ✓ | ✓ |
| Middleware | ✓ | ✓ |
| TypeScript | ✓ | ✓ |
| Edge runtime | ✓ | ✓ |
| Form actions | ✗ | ✓ |
| Multi-framework | ✓ | ✗ |
| File-based routing | ✓ | ✓ |
| Image optimization | ✓ | ✗ |
| Client-side routing | ✗ | ✓ |
| Content collections | ✓ | ✗ |
| Islands architecture | ✓ | ✗ |
What is Astro?
Astro is a content-first web framework shipping zero JavaScript by default. It supports Svelte, React, Vue, and Solid components as interactive islands.
What is SvelteKit?
SvelteKit is a full-stack framework built on Svelte 5, which compiles components to efficient vanilla JavaScript. It provides load functions, form actions, and client-side routing with the smallest bundles of any full-stack framework.
Key Differences
JavaScript Strategy
Astro ships zero JS and hydrates individual islands. SvelteKit ships ~15KB and provides full client-side routing. For pure content, Astro is lighter. For apps, SvelteKit is more capable.
Routing Model
SvelteKit has full client-side routing with page transitions and preloading. Astro uses traditional full-page navigation by default (MPA), though it supports View Transitions.
Content Tooling
Astro has first-class content collections with type-safe Markdown and MDX. SvelteKit requires third-party solutions like mdsvex for similar functionality.
Interactivity Scope
SvelteKit pages are fully interactive by default. Astro pages are static by default with opt-in interactivity per component. The right choice depends on how much interactivity you need.
Framework Flexibility
Astro supports Svelte, React, Vue, and Solid simultaneously. SvelteKit is Svelte-only. If you want Svelte components with zero-JS pages, Astro with Svelte islands is compelling.
Performance Comparison
| Metric | Astro | SvelteKit |
|---|---|---|
| TTFB | Extremely fast | Very fast |
| Build tool | Vite | Vite |
| Base JS bundle | ~0KB (zero JS default) | ~15KB |
| Lighthouse range | 95-100 | 95-100 |
SEO Comparison
| SEO Feature | Astro | SvelteKit |
|---|---|---|
| OG tags | ✓ | ✓ |
| robots.txt | ✓ | ✓ |
| SSG support | ✓ | ✓ |
| SSR support | ✓ | ✓ |
| Structured data | ✓ | ✓ |
| Meta tag control | ✓ | ✓ |
| Sitemap generation | ✓ | ✓ |
Astro
- Zero JavaScript by default
- Use Svelte (or any framework) for islands
- Built-in content collections
- Near-perfect Lighthouse scores
- No client-side routing by default
- Not suited for interactive applications
- No built-in form handling
- Islands pattern has interop limitations
SvelteKit
- Smallest full-stack framework bundles (~15KB)
- Compiler eliminates virtual DOM overhead
- Full client-side routing and transitions
- Form actions for type-safe mutations
- Svelte-only — no multi-framework support
- Smaller component library ecosystem
- No built-in content collections
- Smaller community than React frameworks
When to Choose Astro
- Pure content sites with minimal interactivity
- You want zero JS with Svelte islands where needed
- Blogs, docs, and marketing pages
- Core Web Vitals are the top priority
When to Choose SvelteKit
- Full-stack app with excellent performance
- You want client-side routing with page transitions
- Interactive UIs that need reactivity throughout
- Your team prefers Svelte developer experience
Can You Migrate?
Yes. We've migrated 5,000+ sites between platforms. We handle data migration, content modeling, frontend rebuilds, and SEO preservation. Every migration is zero-downtime.
Frequently Asked Questions
Astro 和 SvelteKit 有什麼區別？
Astro 預設情況下不傳送任何 JavaScript，並使用島嶼架構進行選擇性補液。SvelteKit 是一個編譯為最少原生 JavaScript 的全棧 Svelte 框架。兩者都專注於效能，但服務於不同的使用案例。
Astro 比 SvelteKit 更快嗎？
對於純內容頁面，Astro 更快，因為它不傳送 JavaScript。SvelteKit 的基線約為 15KB，但提供完整的客戶端導航和反應性。對於混合內容+應用程式網站，SvelteKit 提供更好的平衡。
我可以在 Astro 中使用 Svelte 元件嗎？
可以。Astro 原生支援 Svelte 元件作為互動式島嶼。這讓您獲得兩個世界的最佳效果：零 JS 頁面和 Svelte 驅動的互動式元件。
哪個更適合部落格？
Astro。其零 JS 預設、內容集合和 Markdown/MDX 支援使其為部落格而打造。SvelteKit 可以做到，但 Astro 內容工具更成熟。
哪個更適合網路應用程式？
SvelteKit。它提供全棧功能，包括載入函數、表單動作和客戶端導航，而 Astro 島嶼方法無法為應用程式般的體驗匹配。
哪個社群較小？
與 React 相比，兩者的社群都在增長，但相對較小。Astro 有 45K+ 的 GitHub 星；SvelteKit 有 18K+，Svelte 有 80K+。兩者都有活躍、熱情的開發者社群。
Let's build
something together.
Whether it's a migration, a new build, or an SEO challenge — the Social Animal team would love to hear from you.