There is a class of decisions in SaaS marketing site builds that gets made early, gets defended hard, and ends up being mostly wrong for the company's actual stage. The headless CMS decision is the canonical example. A founder reads three blog posts about Sanity, decides Sanity is what the cool kids use, signs up for the $15/seat plan, and six months later the marketing team is editing Markdown files in Git because the Sanity studio is too much friction for shipping a blog post.

I want to make the argument here that the headless CMS decision is almost always made too early. For most early-stage Australian SaaS companies, a content collection in your codebase managed as MDX files is the right answer. The point at which a headless CMS starts paying off is later than the SaaS founder ecosystem suggests, and the cost of choosing one too early is real — both in operational friction and in money.

My opinion: pre-Series A, do not use a headless CMS. Post-Series A with a marketing team of 3+ and a content velocity above two pieces per week, the headless CMS pays back. In between, the right answer is "it depends on the team's technical literacy", which is a less satisfying answer than the binary the vendors want.

What a headless CMS actually does

Let me start with what the category is, because the term is overloaded.

A headless CMS is a content management system that stores content as structured data and exposes it through an API, leaving the frontend to be built separately. The marketing team edits content through a web interface (the "studio"). The frontend code fetches that content through an API and renders it.

The difference between this and the traditional CMS pattern (WordPress, Webflow) is that the frontend is decoupled from the CMS. You can change the CMS without changing the frontend. You can change the frontend without changing the CMS. The two pieces are not welded together.

The four contenders worth taking seriously in 2026:

Sanity

Sanity is the GraphQL-based, real-time-collaboration headless CMS that has become the default for design-conscious SaaS marketing sites. The studio is highly customisable. The editorial experience is generally good. Pricing starts free and scales to $15 USD per seat per month on Growth, with usage-based fees for API requests and bandwidth above the free tier.

For a marketing team of 3 to 8 people, Sanity is the most defensible default.

Payload

Payload is the open-source, TypeScript-native, MongoDB-backed headless CMS that has gained meaningful share in 2025 and 2026. You can self-host for free. Payload Cloud is $35 USD/month for the Standard tier. The developer experience is excellent. The editorial experience is good — slightly less polished than Sanity, but improving fast.

For a SaaS company with engineering capacity that wants to avoid vendor lock-in and is comfortable self-hosting, Payload is the strongest open-source option.

Contentful

Contentful is the enterprise headless CMS that dominated the category for years and is now losing share to the alternatives. Contentful removed its free community tier in Q2 2025 and pricing now starts at the Team tier with median enterprise contracts around $33,000 USD/year. The product is solid. The price is no longer competitive for SaaS startups.

Pick Contentful if you are already enterprise-grade, you are integrating with an enterprise content stack, or your buyer specifically requires it. Otherwise, do not.

MDX in your codebase

The unsung hero of SaaS marketing content. MDX is Markdown with JSX components embedded. Content lives as .mdx files in your codebase, edited in any text editor, committed through Git. No CMS subscription. No API latency. No vendor lock-in.

For early-stage SaaS companies where the marketing team is one person and that person is comfortable in Git, MDX is genuinely the best answer. It is what a meaningful number of high-performing SaaS marketing sites in 2026 actually use.

When MDX is the right call

I want to make the case for MDX in your codebase, because it is the option most underweighted by the SaaS founder ecosystem.

Content velocity is under two pieces per week

A marketing team publishing one to two blog posts per week, occasional case studies, and an occasional new landing page does not need a CMS. The friction of opening a CMS studio, navigating to the right collection, configuring the right schema, and publishing is higher than the friction of opening a text editor.

A solo content marketer or a founder doing the marketing themselves is genuinely faster in Markdown than in any CMS studio.

The content team is technical

If your one content person is the founder, or a technically literate growth marketer, or a developer doubling as a content person, Git-based workflows are not a barrier. They are an advantage. Pull requests on content provide a review loop. Branches let you stage content changes before they go live. The whole thing integrates with the existing engineering workflow.

You want zero vendor risk

MDX in your codebase has no third-party dependency. The CMS cannot raise its prices. The studio cannot change its UI. The free tier cannot be removed. Your content cannot be locked behind an API key.

For a SaaS company that values predictability and ownership, this is a real advantage. The cost is in editorial ergonomics for non-technical editors.

You are deploying on Vercel anyway

Vercel and Next.js have first-class support for MDX. The build pipeline is straightforward. Static-generated pages from MDX content load instantly at the edge. There is no API call to a remote CMS during page render. The performance is the best of any option.

When a headless CMS earns its place

The shift from MDX to a headless CMS makes sense at a specific point.

When the marketing team is 3+ people

Three content marketers cannot collaborate in MDX. Git workflows that work for engineers do not work for content writers. You need a real editorial UI with draft states, role-based permissions, and review workflows.

This is the single biggest trigger. If you are hiring your second or third marketer, plan the CMS migration.

When you have 20+ content pages to maintain

Beyond about 20 to 30 marketing pages (blog posts, case studies, use cases, integration pages), the maintenance friction of MDX starts to bite. Updating a CTA on every page becomes a multi-file PR. Restructuring the navigation becomes a coordinated change across the codebase.

A CMS centralises content models. Change one block, the change propagates everywhere it is used.

When non-technical editors need direct access

A product marketer, a customer success lead, or a sales engineer who needs to update a case study or publish a customer quote should not need to learn Git. A CMS gives them a real UI that does not require engineering involvement for routine changes.

This is the operational case that almost every SaaS company eventually faces.

When the content team needs structured data

A "case study" is not just a long blog post. It is structured data — customer name, industry, deal size, outcome metrics, quote, photos, related products. A CMS lets you model this structure explicitly. MDX makes you build it in convention.

If your case studies, use cases, or integration pages have rich structured data that gets queried programmatically (for listing pages, for related-content components, for SEO), a CMS makes this materially easier.

The Sanity vs Payload decision

For SaaS companies that have decided they need a CMS, the next question is which one. The realistic shortlist in 2026 is Sanity and Payload. Contentful is too expensive for most non-enterprise contexts.

Sanity is right when

The marketing team is 4+ people including non-technical editors
The editorial experience is critical (frequent content publishing, polished review flows)
You want the most mature integration ecosystem
You are willing to pay $15 USD per seat per month and live with usage-based fees
You want real-time collaboration

Payload is right when

You have engineering capacity to self-host
You want zero vendor lock-in
You prefer TypeScript-native development
You are comfortable with a less-polished editorial UI in exchange for full ownership
Your team is small enough that self-hosting is operationally tractable

For most Series A Australian SaaS companies with a 3-to-5-person marketing team and a Next.js stack, Sanity is the lower-friction default. For companies with strong engineering culture and a preference for open source, Payload is the better long-term call.

The performance question

A headless CMS does have a real performance cost if you implement it naively. An API call to fetch content on every page request is a 100ms to 300ms latency cost — measurable on Core Web Vitals.

The mitigation, in 2026, is Next.js Cache Components and partial prerendering. Marketing pages are statically generated at build time or revalidated on a schedule. The CMS is consulted at build, not at request. The user gets static-fast pages and the marketing team gets dynamic-CMS editing.

This is one of the genuine wins of Next.js with Vercel as the deployment target. The pattern works. The bottom-quartile sites that use a CMS and serve dynamic content from API calls on every request are paying a meaningful performance cost. The top-quartile sites with the same CMS are not.

The Australian context

A few specifics worth grounding in.

Sanity has its own Australian-region hosting and the API latency from Australian Vercel edge nodes to Sanity is reasonable. For most use cases, this is not a deciding factor.

Payload self-hosted on AWS Sydney gives you full control and predictable latency for an Australian audience. The infrastructure cost is modest — $50 to $200/month for a small SaaS company's content needs.

The Australian Privacy Act reforms taking effect in late 2026 increase the importance of data residency and processor relationships. Self-hosted Payload simplifies the compliance position relative to SaaS CMS vendors — fewer third-party data processor relationships to document.

The decision rule

I will give you the rule I use with SaaS founders.

Stay on MDX in your codebase if:

Your marketing team is 1 to 2 technically literate people
You have under 30 published marketing pages
Your content velocity is under 8 pieces per month
You value zero vendor risk

Move to Sanity if:

Your marketing team is 3+ including non-technical editors
You have 30+ marketing pages or are heading there
Your content velocity is 8+ pieces per month
The editorial experience is critical for your team

Move to Payload if:

You have the engineering capacity to self-host
You want full ownership and zero vendor lock-in
Your team is small enough that the editorial UI is acceptable
You prefer TypeScript-native development

Move to Contentful if:

You are enterprise-grade and your buyers expect it
You are integrating with a broader enterprise content stack
The price is not the constraint

The honest bottom line

The headless CMS decision is almost always made too early. Most early-stage Australian SaaS companies should stay on MDX in their codebase longer than the SaaS founder ecosystem suggests, and the move to Sanity or Payload should be triggered by team size and content velocity, not by what looks impressive on a build spec.

The companies who pick the right CMS at the right stage spend their time on content. The companies who pick the wrong CMS at the wrong stage spend their time fighting the CMS.

If you want a fast read on whether your current site is the bottleneck or just the convenient thing to blame, run our free audit on the URL. The report covers performance, SEO, and the rendered content surface on mobile and desktop. Often the CMS isn't the problem — it's a 4.2s LCP and a hero image nobody compressed — and the audit will tell you that in plain English before you sign a Sanity contract you don't need yet.

Headless CMS for SaaS: Worth It or Overengineered? (2026)