Two Different Philosophies
Next.js and Astro approach web development from fundamentally different angles. Understanding this is key to choosing the right one.
Next.js: A React framework for building interactive web applications with SSR, SSG, and now Server Components. Best for apps with heavy interactivity.
Astro: A content-focused framework that ships zero JavaScript by default. Best for content sites, blogs, docs, and marketing pages.
Performance Comparison
| Metric | Astro (static) | Next.js (SSR) | Next.js (SSG) |
|---|---|---|---|
| TTFB | ~50ms (CDN) | ~200-500ms | ~50ms (CDN) |
| JS Bundle | 0 KB default | 80-200 KB | 80-200 KB |
| Lighthouse Score | 99-100 | 85-95 | 90-98 |
| Build Time (100 pages) | ~3s | ~15s | ~8s |
When to Choose Astro
- Blogs, docs, portfolios, marketing sites
- SEO is critical
- You want maximum Lighthouse scores
- Content-heavy with minimal interactivity
- Multi-framework (use React + Vue + Svelte in same project)
When to Choose Next.js
- SaaS dashboards with heavy interactivity
- Apps requiring authentication and sessions
- Real-time features (chat, notifications)
- Complex state management
- Team already knows React deeply
The Hybrid Approach
Many teams in 2025 use both: Astro for the marketing site and docs, Next.js for the app. They share a design system and deploy to the same domain with path-based routing.
Verdict
For content sites (which is 80% of the web): pick Astro. For interactive apps: pick Next.js. Don’t use a React framework for a blog, and don’t use a static generator for a dashboard.