Clearing the Ground First

Most Contentful comparisons you will read are out of date, so let's retire two arguments before they waste your time.

Contentful has visual editing. Studio Experiences gives marketers drag-and-drop layout building on top of components that developers register from their own React code, with design tokens carried over. That is close enough to what Cmssy does that "headless means no visual editor" is simply not a claim anyone can make here.

Contentful has a code-first workflow. Content types can be changed through migration scripts run with the CLI - contentful space migration - versioned alongside your application code. If someone tells you Contentful forces you to click through a UI to model content, they have not read the docs.

So this is not a comparison of a modern tool against a legacy one. It is a comparison of a broad enterprise content platform against a focused CMS for building sites, and the honest question is which one your project actually needs.

What Each One Is

Contentful is a content platform. Its centre of gravity is the content model: spaces, environments, content types, entries, roles, and a large App Framework for extending the authoring experience. Sites are one of many things you might build on top of it - the same content also feeds apps, kiosks, emails and product catalogues.

Cmssy is narrower on purpose. It is a headless CMS for building websites: pages composed of blocks, a visual editor that frames your deployed Next.js app, content models for the structured data those blocks pull in, and an MCP server so an AI agent can operate the whole thing. If you need a content backbone for six channels, we are not the answer. If you need a site your marketing team can run, we are a much shorter path.

Pricing

This is the widest gap, and it is not close.

Contentful: Free at $0 (10 users, 2 locales, 25 content types, 100K API calls/month), Lite at $300/month (20 users, 3 locales, 1M API calls/month), Enterprise on request.

Cmssy: Hobby free (1 workspace, 5 pages, 3 custom blocks), Pro at $19/month (5 workspaces, unlimited pages, 25 custom blocks, AI and MCP), Enterprise on request.

The jump from free to paid is $0 to $300 at Contentful and $0 to $19 at Cmssy. For a company running one marketing site, that difference is the whole decision. For a company running content operations across a dozen products, $300 is not the number that matters and you should skip to the section on where Contentful wins.

Contentful figures checked 27 July 2026 - verify before you decide.

Multilingual

Contentful meters locales: 2 on Free, 3 on the $300/month Lite plan, custom on Enterprise. A fourth language means an Enterprise conversation.

Cmssy does not meter languages. Every block is language-keyed at the content level on every plan, and AI fills in translations over MCP. This article exists in five languages at no extra cost.

Winner: Cmssy - and if you are a European business, this is likely the line that decides it.

API Metering

Contentful counts API calls: 100K/month on Free, 1M/month on Lite. A server-rendered site with any traffic will make you think about caching strategy as a billing question, not just a performance one.

Cmssy has API and bandwidth limits too, but they are not the axis the plans are built around, and GraphQL is available from the free plan up rather than being a tier.

AI

Contentful has AI features layered into the authoring experience.

Cmssy exposes the entire workspace over an MCP server. An agent like Claude creates pages, writes copy, fills translations, and sets SEO fields through the same API the editor uses - working on content, never on your code. That is a different shape from AI-assisted fields: you describe an outcome and the agent executes it across pages.

Winner: Cmssy - agentic content operations rather than assistance inside a form.

Time to First Page

Contentful's breadth has a cost at the start. You model content types, set up spaces and environments, wire roles, install and configure Experiences, and register your components before a marketer can move a section. That investment pays off across many channels and teams.

Cmssy starts from the assumption that you are building a site. You install @cmssy/react and @cmssy/next, write a few blocks with defineBlock, deploy, and the editor frames your live site. An afternoon rather than a project.

Where Contentful Wins

A comparison where the vendor sweeps every round is marketing, so here is where Contentful is genuinely ahead of us:

• Environments and aliases - sandbox environments with alias switching, plus contentful-merge for diffing and merging content models between them. This is a genuinely excellent piece of engineering and we do not have an equivalent.
• Governance - granular roles and permissions, approval workflows, audit logs and compliance posture built for regulated industries.
• Scale and reliability - years of large production deployments and an SLA of up to 99.99% on Enterprise.
• Ecosystem - the App Framework and a large marketplace of integrations and custom field extensions. Ours is young.
• Omnichannel - if the same content must serve web, mobile, in-store screens and email, Contentful is designed for that and we are not.
• Framework breadth - SDKs across many frameworks and languages. Cmssy is deliberately focused on React and Next.js.

Comparison

The Verdict

Choose Contentful if content is infrastructure at your company - many channels, many teams, compliance requirements, a need for environments and approval workflows. The $300 entry price is irrelevant at that scale, and the platform earns it.

Choose Cmssy if you are building websites and the platform tax is not buying you anything. You get visual editing and code-owned blocks either way; here you also get languages that are not metered, GraphQL without a tier, an AI agent that operates your content, and a bill that starts at $19 instead of $300.

The honest one-liner: Contentful is a content platform that can build sites. Cmssy is a site CMS that does not pretend to be a platform. Pick the one that matches the problem you actually have.

Next Steps

• Follow the installation guide to wire @cmssy/react and @cmssy/next into a Next.js app
• See how blocks are defined in code
• Read about the MCP server
• Compare Cmssy and Storyblok