Quilium vs WordPress,
for agencies that deliver client sites.
WordPress is open source software that you extend with themes and plugins, on a host you choose. Quilium is a SaaS: the CMS, hosting, security and AI are run for you, as one managed product.
The short answer
Choose WordPress when the project needs its plugin ecosystem, such as WooCommerce, or when the client wants open source software on a host of their choice. Choose Quilium when you build custom designs for clients and want a managed SaaS instead of a stack to maintain: structured content, EU hosting, native multilingual and an MCP server in one product.
WordPress is the better fit if
- The project depends on a WordPress plugin, such as WooCommerce for a shop.
- The client wants open source software and on choosing their own host.
- Your team already runs, or your host provides, a maintenance routine: updates, security, backups.
- You want to start from one of thousands of existing themes.
Quilium is the better fit if
- You start from your own design or an HTML prototype and want it turned into editable fields.
- Clients edit content in fields, and the layout stays fixed by your templates.
- Sites ship in several languages, included in every plan.
- You want no plugin updates to test, no conflicts to debug and no security patches to apply.
- You build with Claude Code, Cursor or Codex and want an MCP server built in, with nothing to install.
Side by side
The same client site, two ways to run it.
| WordPress | Quilium | |
|---|---|---|
| What it is | Open source CMS, installed on a host you choose. Themes and plugins add features. | SaaS CMS: content model, rendering, hosting, security and AI, run for you as one managed product. |
| Content model | Posts, pages, categories, tags and custom fields built in. Custom post types through code (register_post_type) or plugins like ACF. Page builders such as Elementor store the page's content inside its layout data. | Page types, collections and fields declared in YAML, versioned with the templates. The editing screens are generated from them, shaped around the client's data. |
| Multilingual | Available through plugins such as WPML, Polylang or TranslatePress. | Native. Unlimited languages on every plan, URLs and hreflang handled. |
| Hosting and security | You choose the host. Minor core updates install automatically; plugin updates, backups and firewall depend on your host and setup. | Included: EU hosting, SSL, WAF, daily backups and monitoring. Platform updates applied and tested by us, nothing to install on your side. |
| AI and agents | Abilities API in core since 6.9, AI Client and Connectors since 7.0. Official MCP Adapter as a separate plugin or Composer package. | MCP server, CLI and API. A built-in assistant working within the user's permissions. |
| Many sites | Multisite networks in core, or dashboards such as ManageWP and MainWP. | One hub for all your sites, included: server-side traffic analytics, site health, blocked attacks. |
| Cost | Free software. Hosting, premium themes and paid plugins are billed separately by their vendors, plus the time spent on updates, monitoring and fixes. | A flat price per live site, platform upkeep included. Building is free until the site goes live. |
WordPress is a trademark of the WordPress Foundation. WordPress facts checked against wordpress.org, developer.wordpress.org and each vendor's own site, September 2026.
What changes
Three differences that matter on client sites.
One product instead of a stack
Beyond its core, WordPress gets its features from the themes and plugins you choose and manage. On Quilium, forms, redirections, SEO metas, multilingual and backups are part of the platform. No plugin updates to test, no conflicts to debug, no security patches to apply: Quilium updates the platform for every site at once.
A back office generated from your model
You declare page types, content blocks and collections in YAML, and the back office is generated from that declaration. Editors fill in fields; templates decide how they look. A client publishes an event alone, and the page looks exactly like your design.
MCP server included
A Quilium site is a folder of Liquid templates and YAML settings, plus an MCP server that exposes pages, collections, media and settings as tools. Your coding agent reads an HTML prototype, proposes the content model and writes the templates. You review each step.
Questions agencies ask.
Is Quilium open source?
No. Quilium is a SaaS, operated from Luxembourg, with data in the EU. The templates stay yours, as plain Liquid and HTML in your repository, and the content is readable through the API at any time.
Can Quilium replace WooCommerce?
Not for a full shop. Quilium is built for content sites: corporate, institutional, editorial, portals, catalogues. For a shop, WooCommerce, the open source ecommerce platform for WordPress, or a dedicated commerce platform is the better tool.
What does Quilium cost?
A flat price per live site: €59.90 a month for Starter, VAT included, billed yearly. Hosting, backups, unlimited languages and MCP access are included. Agencies get partner pricing through the Partner program.
Try it on your next client site.
Bring an HTML prototype. Building is free, you pay when the site goes live.