Astro and Sanity CMS for Agencies

Lucky Media is an official Astro Partner, and Sanity is one of the headless CMS platforms we use most in client work. When a new client asks why their agency recommended this combination, the answer usually comes down to three things: performance that does not degrade over time, a content editing experience that marketing teams can actually own, and architecture that does not hold you hostage to a single vendor.

Why Agencies Are Moving Away From WordPress and Webflow

The agencies we talk to are running into the same set of problems with WordPress: pages slow down as plugins accumulate, security updates create deployment risk, and the visual editor is easy to start with but painful to maintain at scale. Webflow is cleaner, but your content lives inside Webflow, and moving it out is more work than most teams budget for.

Both tools blend content, design, and code together in ways that create friction over time. The shift toward headless architecture separates those concerns. Your content lives in a structured database. Your frontend fetches and renders it. Design and layout live in code, not in a theme. That separation is harder to set up initially and much easier to maintain over the next three years.

What Is Astro and Why Does Performance Matter for Your Business?

Astro is a frontend framework that ships zero JavaScript to the browser by default. Most modern frameworks, including Next.js, send a full JavaScript bundle to every visitor. The browser has to download, parse, and run that bundle before anything becomes interactive. For marketing sites, landing pages, and content-heavy pages, that is unnecessary overhead.

Astro renders to plain HTML at build time. If a specific component needs interactivity, Astro loads only that component's JavaScript, and only when it is needed. The result is pages that load in under a second on average connections and consistently strong Core Web Vitals scores.

Google uses Core Web Vitals as a ranking signal, so a faster site ranks higher in organic search. Pages loading in under two seconds also outperform slower equivalents on bounce rate and conversion. Performance is not a technical metric, it is a business metric.

As an official Astro Partner, we have built production Astro sites across industries. The performance improvements are consistent and measurable.

What Is Sanity CMS? An Editor's-Eye View

When a content editor logs into Sanity Studio, they see a clean, structured interface. No plugin menus, no theme options, no settings buried four levels deep. A typical setup has a sidebar with content types, Blog Posts, Team Members, Case Studies, Landing Pages. Clicking into an entry shows a form with fields that match what actually appears on the page. Body content uses Portable Text, Sanity's rich text format, which works like a lightweight word processor: headings, paragraphs, bold, links, images. No raw HTML.

Sanity Studio supports real-time collaboration, full revision history, and draft previews before publishing.

For marketing teams used to WordPress, the first reaction is usually that it feels simpler. The tradeoff: the structure is defined by a developer. Editors cannot add new section types or change page layout themselves. That is a meaningful limitation, which we cover below.

Why These Two Work Well Together for Agency Clients

The combination works because Astro and Sanity solve different problems and do not step on each other.

Sanity handles content storage, editing, and delivery. It provides a CDN-backed API that Astro queries at build time. The content model in Sanity, your page types, fields, and relationships, maps directly to components in Astro. When an editor publishes a change in Sanity, a webhook triggers a rebuild and the updated page is live in minutes.

For headless CMS development projects, this architecture produces a clean handoff. The CMS is the editor's tool. The frontend is the developer's tool. Neither team is blocked by the other during normal operations.

Content is also fully portable. Sanity stores everything as structured JSON. It is not entangled with a theme or tied to a specific frontend technology. If you want to add a mobile app that consumes the same content, or rebuild the frontend in three years without touching the CMS, that is straightforward.

What Does Building on This Stack Actually Cost?

Sanity pricing. The free tier covers up to 20 user seats, with 2 permission roles, and 250k API requests per month. That covers most small to mid-size marketing sites. The Growth plan is $15 per user per month and adds more users, higher API limits, and role-based access control. For a team of five editors, that is $75 per month. There is no per-site fee.

Astro hosting. Astro sites are typically deployed as static files or as server-rendered apps. Static deployments on Vercel or Netlify are free at low traffic and scale predictably. There is no proprietary hosting lock-in.

Development cost. A typical marketing site is four to eight weeks of development. Longer to set up than a WordPress theme, but the ongoing maintenance cost is lower: fewer moving parts, no plugin updates, no database to secure.

Real Results: What Clients Have Seen

We rebuilt Chainguard's website from scratch in one month. Speed of execution was possible because the architecture was clean from the start: no legacy theme debt, no plugin conflicts.

At data.world, our work contributed to 99% faster page launches and $120,000 in cost savings. When content is structured and the frontend is fast, marketing teams move without waiting on developers for every change.

For more detail on our Sanity work and how we evaluate it against alternatives, see our Sanity CMS review.

What Are the Limitations?

Astro is not ideal for app-like features. Complex client-side interactivity, user authentication, and real-time data are harder in Astro than in Next.js. Astro excels at content-heavy, mostly-static sites. For product apps, we lean toward Next.js.

Content model changes require development. Adding a new field or content type is a developer task, not an admin panel toggle.

Editor onboarding takes time. Teams coming from WordPress need a few weeks to feel comfortable in Sanity Studio. Budget for training and a support period after launch.

Is This Stack Right for Your Project?

This combination is a strong fit for: marketing sites and corporate sites where performance and long-term maintainability matter, content teams with structured workflows, companies that want to own their content architecture and not be locked into a vendor, and projects where SEO performance is a priority.

It is a harder fit for: teams that need full control over page layout without developer involvement, products with heavy client-side interactivity, or projects with very short timelines and no budget for setup.

If you are evaluating this stack for a new project or a site migration, our Astro development team is happy to give you an honest assessment of whether it fits your situation. We have built enough of these to tell you when it is the right call and when it is not.

faq

Is Sanity CMS better than WordPress and Webflow?

For most marketing and agency sites, yes. Sanity gives editors a clean, structured interface without plugins, theme conflicts, or security patches. Your content lives in a database you own, not inside a theme. Performance is dramatically better because there is no PHP rendering on every page load. The tradeoff: you need a developer to change page layouts. If your team manages content daily and rarely needs layout changes, Sanity is the better long-term choice.

What are Sanity CMS's limitations?

Sanity does not have a visual drag-and-drop page builder out of the box. Changing the layout of a page, adding a new section type, or reordering components still requires a developer. It also has a learning curve for editors who are used to WordPress and Webflow. The free tier covers most small projects, but teams with more than three editors will need the Growth plan at $15 per user per month.

Why is everyone switching from Next.js to Astro?

Astro ships zero JavaScript to the browser by default, which is a fundamental difference from Next.js. Next.js was designed for web apps with lots of interactivity. Most marketing sites, landing pages, and content sites do not need that level of JavaScript. Astro produces smaller pages, faster load times, and better Core Web Vitals scores for content-heavy sites. Next.js is still the right choice for app-like products. For our work on marketing and agency sites, Astro is usually the better fit.

How long does it take to build a site with Astro and Sanity?

A standard marketing site with 10 to 20 page types, a blog, and a Sanity content model typically takes four to eight weeks from kickoff to launch. Timelines depend on design complexity, the number of content types, and how much content migration is involved.

Who owns the content if we switch agencies?

You own it entirely. Sanity stores your content in their cloud, but the data is yours and fully portable. You can export everything as JSON, connect a different frontend, or move to a self-hosted setup. There is no content locked inside a WordPress theme or a proprietary page builder. This is one of the strongest reasons we recommend Sanity to clients who want long-term flexibility.