Astro builds static HTML by default, which changes what you should want from a CMS. The content fetch runs once at build time, not on every request, so raw API latency matters far less than it does on a server-rendered stack. What matters instead is whether the SDK works cleanly inside Astro frontmatter, whether getStaticPaths can hydrate every page from a single query, and whether a rebuild gets triggered when an editor publishes.

This guide compares four headless CMS platforms on those terms. Every price below was read directly from the vendor's own pricing page on November 10, 2026, and each figure is linked to its source. Vendors whose pricing could not be read and cited on that date were left out rather than guessed at.

What Astro actually needs from a CMS

A JavaScript SDK that runs in frontmatter. Everything between the --- fences executes on the server at build time. An SDK that assumes a browser or a long-lived server process will fight you.

Lean queries. A list page needs a title, a slug, and an image. Pulling full post bodies you never render is the easiest performance mistake to make on a static build.

One query per route set. getStaticPaths runs once and enumerates every dynamic route. If you can pass the fetched record through props, you build the whole blog in a single request instead of one lookup per page.

A rebuild trigger. Static output does not change when content changes. You need a webhook that calls your host's deploy hook on publish.

Predictable empty-result behavior. At build time, an unhandled error from the CMS fails the entire build, not one page.

Cosmic

Cosmic is a SaaS headless CMS with a REST API and an official TypeScript SDK, @cosmicjs/sdk. It is a Y Combinator company (W19). Astro's own documentation ships a Cosmic integration guide, so the setup path is documented on both sides.

The SDK is a plain async client, which is what you want inside frontmatter:

// src/lib/cosmic.ts import { createBucketClient } from '@cosmicjs/sdk'; export const cosmic = createBucketClient({ bucketSlug: import.meta.env.COSMIC_BUCKET_SLUG, readKey: import.meta.env.COSMIC_READ_KEY, });

Astro reads environment variables through import.meta.env, not process.env. That is the single most common porting error when you move example code over from a Next.js tutorial. Skip the PUBLIC_ prefix on these two values so they stay out of the browser bundle.

Building every post page from one query:

--- // src/pages/blog/[slug].astro import { cosmic } from '../../lib/cosmic'; export async function getStaticPaths() { const { objects } = await cosmic.objects .find({ type: 'blog-posts' }) .props(['title', 'slug', 'metadata']) .depth(1); return objects.map((post: any) => ({ params: { slug: post.slug }, props: { post }, })); } const { post } = Astro.props; --- <article> <h1>{post.title}</h1> <div set:html={post.metadata.content} /> </article>

Because getStaticPaths already fetched every post, handing the record through props means no second lookup per page. .depth(1) resolves relationships, so an author reference comes back as the full author object rather than an ID.

One behavior worth knowing before your first build: when a query matches nothing, the SDK throws a 404 rather than returning an empty array, and both find() and findOne() do this. On a static build that fails the whole build, not one page. Wrap calls that can legitimately come back empty in a try/catch.

Pricing, read from the Cosmic pricing page on November 10, 2026: Free is $0 with 1 Bucket, 2 team members and 1,000 Objects. Builder is $99/month with 2 Buckets, 3 team members and 5,000 Objects. Team is $299/month with 3 Buckets, 5 team members and 20,000 Objects. Business is $499/month with 5 Buckets, 10 team members and 50,000 Objects. Enterprise is custom. Additional team members are $29/user/month. Webhooks, localization, revision history and automatic backups are per-project add-ons at $99/month each, or $199/month for all four bundled.

Be deliberate about that last line if you are costing out an Astro project: the publish-triggers-rebuild workflow depends on webhooks, so price the add-on in from the start rather than discovering it later.

Good fit if: you want a hosted CMS with a typed SDK, an editor UI non-technical teammates can use without training, and every price published in full.

Think twice if: you need to self-host or keep content on your own infrastructure. Cosmic is SaaS only.

Sanity

Sanity is the most configurable option here. Content is queried with GROQ, its own query language, and the editing environment (Sanity Studio) is a React application you deploy and maintain yourself. If you have strong opinions about how your editing UI should behave, Sanity will let you build exactly that.

For Astro specifically, the tradeoff is front-loaded work. Standing up Studio, writing your schemas, and learning GROQ is a development project before you render your first page. Teams with frontend engineering capacity get real value from it. Teams who want to ship a content site this week usually do not.

Pricing, read from the Sanity pricing page on November 10, 2026: Free is $0 and includes up to 20 seats, 2 public datasets and 10,000 documents. Growth is $15 per seat/month, up to 50 seats, with 25,000 documents. Enterprise is custom.

The free tier is unusually generous on seats, which makes Sanity cheap to evaluate. Model your costs on documents and datasets rather than seats, since that is where the ceilings bite first.

Storyblok

Storyblok's distinguishing feature is its visual editor. Editors click a component on a live preview of the page and edit it in place. For a marketing site where layout changes constantly, that shortens the feedback loop a lot.

The component-based model shapes how you structure content, which suits page building well and application-style content less well. On Astro, the visual editor needs a preview route your editors can load, so budget setup time for it rather than assuming it works against a static build out of the box.

Pricing, read from the Storyblok pricing page on November 10, 2026: Starter is free with 1 space and up to 2 seats. Growth is $99/month. Growth Plus is $349/month. Premium and Elite are custom. Additional seats on Starter and Growth are $15/month each, and annual billing is discounted below the monthly list price.

The detail to catch is that Storyblok prices per space. If you run several distinct sites, that is several subscriptions, and the comparison against per-project competitors changes shape.

Strapi

Strapi is the open-source option. You can self-host it, read and modify the codebase, and keep your data on your own infrastructure. For teams with data residency or compliance requirements, that is a decisive advantage no SaaS platform can match.

The cost is operational. You own deployments, version upgrades, security patches, and the database. Major-version upgrades have historically needed real migration work. Strapi Cloud removes most of that burden and adds a bill.

Pricing, read on November 10, 2026: on the Strapi Cloud pricing page, Starter is $35 per project/month, Pro is $90 per project/month, and Business is $450 per project/month. On the Strapi CMS pricing page, the self-hosted Community edition is free and open source, with paid self-hosted editions quoted on the same page.

Note that Cloud is priced per project, so a multi-site Astro setup multiplies that figure rather than sharing it.

How to choose

You want to ship an Astro site quickly, with a typed SDK and an editor UI your marketing team can use: Cosmic.

You have frontend engineers and want to shape the editing experience yourself: Sanity.

Your editors need to click a live page and edit it in place: Storyblok.

You must self-host, own the data, or meet residency requirements: Strapi.

For most Astro projects the deciding factor is not raw API capability, since all four will serve content to a build step perfectly well. It is how much setup work sits between npm create astro@latest and an editor publishing without filing a ticket.

Build it

The fastest way to judge any of these is to put a real site on it. The Astro lesson in Cosmic Learn walks the whole path: SDK install, lean queries with .props(), static routes with getStaticPaths, and a Vercel deploy with the rebuild webhook wired up. The Astro CMS overview covers content modeling and the editor experience on one page, and the API documentation has the full query reference.

If you want the wider field rather than the Astro-specific one, we compare ten platforms in Best Headless CMS in 2026.

Start free with Cosmic, no credit card required. If you would rather talk through a migration or a multi-site setup first, book time with our CEO.