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WordPress to Headless CMS: When Sanity, Next.js, and Vercel Make Sense
Gabriel Abussafi
Founder
Your Digital Growth Partner
From strategy and design to development and launch, we build digital experiences that move your business forward.
Every few weeks a founder tells me their engineers want to rebuild the marketing site on Next.js with Sanity and host it on Vercel. Sometimes that’s exactly right. More often it trades one bottleneck for a more expensive one. Here’s how to tell the difference before you commit.
Where I stand: GG Studio builds marketing sites on Framer, and we work as the design partner for product and engineering teams that own their own code. So I see both sides: teams that went headless and love it, and teams that went headless and now need a developer to change a headline, which is exactly the problem they left WordPress to escape.
What “Headless” Actually Means
A traditional WordPress site is one system: the CMS stores the content and also renders the pages.
A headless setup splits them. A CMS like Sanity stores and structures the content. A front-end framework like Next.js renders the pages from that content. A platform like Vercel builds and hosts the front end. Your WordPress can even stay as the content backend, with only the front end replaced.
The split is the whole point. Content becomes structured data any surface can use (website, app, docs, emails), and engineers get full control of the front end. The cost is that you now own a software project, not a website.
When Headless Makes Sense
Your content is a product, not a page. If the same content feeds your website, your app, your help center and your partner portals, a headless CMS is the clean way to model it once and use it everywhere.
You have a real content operation. Hundreds or thousands of articles, many authors, editorial workflows, localization at scale. Sanity’s structured content and editing tools handle this well.
The site is deeply connected to the product. Logged-in states, live product data, pricing pulled from your billing system, personalization driven by your own user data. A no-code builder fights this. A code-owned front end doesn’t.
You have engineers who want to own it, long term. Not “can build it once”, but will maintain it, update dependencies and ship changes for marketing every week. This is the condition teams underestimate most.
Performance and control are hard requirements. Strict security reviews, custom infrastructure, specific compliance needs. A code-owned stack gives you control over every layer.
When Headless Is the Wrong Call
Your site is a marketing and conversion asset run by a small team. If the main job is explaining the product and booking demos, headless adds engineering cost without adding conversion. Marketing ends up waiting on a sprint to change a section.
Nobody will own it after launch. A Next.js site built by a contractor and left alone ages fast. Dependencies drift, builds break, and the site freezes in the state it launched.
You want speed of iteration. Startups rewrite positioning constantly. In Framer, a designer changes and publishes the same day. In a headless stack, the same change is a ticket, a pull request, a review and a deploy, unless you invested heavily in a page builder on top of the CMS.
The real reason is “our engineers prefer it”. That’s a valid input, not a strategy. The question is what the site needs to do for revenue, and who will change it every week.
The Real Cost of Going Headless
The software is cheap at small scale. Sanity, Next.js and Vercel all have free or low-cost entry plans. The cost is people.
You pay for: the front-end build, the content modeling in the CMS, a preview and editing setup so marketers can see what they publish, the SEO plumbing (metadata, sitemaps, redirects, structured data, all built by hand), and ongoing engineering time for every change the CMS doesn’t cover.
That’s why headless marketing sites are a bigger investment than a Framer or Webflow build of the same scope, before and after launch. For how a no-code build is priced, see our SaaS website design cost breakdown.
How to Migrate From WordPress to Headless Without Losing Traffic
The SEO rules don’t change because the stack is more technical. If anything, there’s more to build by hand.
1. Audit first. Crawl every URL, export top pages and rankings, map backlinks and document on-page SEO. Same as any migration.
2. Model the content. Turn WordPress posts, pages and custom fields into Sanity schemas. Decide SEO fields (title, description, canonical, social image) as part of the schema, not as an afterthought.
3. Build the design system before the pages. Components in code should mirror components in design, one to one. This is how we worked with Promomash’s engineers: we audited what existed, built the system (semantic color tokens, an 8pt/4pt spacing grid, one filter model), and their team implemented it screen family by screen family. The same discipline keeps a headless marketing site consistent.
4. Build the redirect map. Every old URL gets a destination, implemented in the Next.js or Vercel config. Never a blanket redirect to the homepage.
5. Rebuild the SEO layer. Metadata per page, XML sitemap, robots rules, canonicals and structured data. None of it comes for free. Test it on a preview deploy.
6. Give marketing a real editing experience. Live preview, reusable page sections, clear fields. If editors can’t publish a landing page without a developer, you rebuilt the old bottleneck in a newer stack.
7. Launch and monitor. Launch early in the week, submit the sitemap, and watch traffic, rankings and crawl errors daily for the first month.
The full checklist is in our redesign and migration checklist, and the search side goes deeper in how to migrate from WordPress without losing SEO.
A Simple Test
Ask three questions:
Does our content need to live in more than one product surface?
Do we have engineers who will own this site every week, for years?
Does the site need live data or logic a no-code builder can’t handle?
Three yes answers: headless is probably right. One or none: a Framer or Webflow site will serve you better, for less, and your marketing team will be able to run it. Somewhere in between: talk it through before anyone writes code.
The Honest Verdict
Headless is a great architecture for companies whose content and product are deeply connected and whose engineers want to own the front end. It’s an expensive detour for companies whose website is mainly a marketing and conversion asset.
Most funded startups are the second kind. For them, the path that removes the bottleneck is a design-led platform their team can edit. If that’s you, compare the options in WordPress to Webflow or Framer and why modern teams are moving away from WordPress.
GG Studio designs and builds websites for funded B2B SaaS and AI startups, and works as the design partner for engineering teams that own their own stack. If you’re deciding between headless and a design-led platform, book a call and we’ll give you a straight answer for your setup:
