Astro vs SvelteKit

A content-first islands framework versus a full-stack Svelte app framework — pick based on whether the deliverable is a site or an app.

Astro

The web framework for content-driven websites

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SvelteKit

The fastest way to build Svelte apps with server rendering

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Our take

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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At a Glance

Attribute	Astro	SvelteKit
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	—

Community Popularity

Astro

SvelteKit

Key Features

Astro

content-driven sites
fast marketing sites
islands architecture

SvelteKit

No features listed.

Pros & Cons

Astro

Pros

The default output is static HTML with zero JavaScript unless you explicitly add interactive components — pages are fast by default+176
Islands architecture lets you use React, Vue, or Svelte components side by side in the same project without committing to one framework+163
Content Collections with TypeScript validation for Markdown files is the cleanest content management DX for developer blogs and docs+148
Build output is genuinely tiny — a blog or marketing site built in Astro will score higher on Core Web Vitals than any SPA alternative+134
The zero-JS default approach means great SEO out of the box without any configuration or SSR tricks+119

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SvelteKit

Pros

Svelte's compile-step approach produces the smallest client bundle of any major framework — less JavaScript shipped means faster pages+172
The reactivity model is so simple that you can onboard developers who've never used Svelte in a single afternoon+158
Form actions are the cleanest implementation of server mutations in any web framework — progressive enhancement comes for free+143
The file-based routing with layout inheritance is intuitive and doesn't require any configuration to get right+129

Cons

The smaller ecosystem means some UI component libraries, auth solutions, and integrations aren't as mature as their React equivalents+138
Svelte 5's rune syntax is a significant paradigm shift from Svelte 4 and the migration required rewriting a lot of reactive state logic+124
TypeScript integration has some quirks around typing store subscriptions and component props that require workarounds+89

See full review of SvelteKit→