Contentful is one of the oldest and most established headless CMS platforms. Launched in 2013, it pioneered the API-first CMS model that the broader industry has since adopted. It is a mature, well-documented platform with a large ecosystem of integrations, a capable editorial interface, and a content delivery infrastructure built for scale. For publishing teams evaluating headless CMS options, Contentful warrants serious consideration — with a clear-eyed understanding of where it excels and where its costs and complexity create friction.

Sanity is a headless CMS built around a principle it calls “structured content” — the idea that content should be modeled as data first, with presentation a separate concern. For publishers whose content is genuinely complex — articles with rich metadata, multiple content types with relationships, content repurposed across channels — Sanity’s approach delivers a level of flexibility that database-backed traditional CMSes struggle to match. It is not the simplest tool in the category, but for the use cases it is designed for, it is among the most capable.

The WordPress REST API has been part of WordPress core since version 4.7. It transforms WordPress from a self-contained CMS into a content platform that can serve data to any application that can make an HTTP request — mobile apps, static front ends, third-party services, or another WordPress site. For publishers evaluating headless architecture or building integrations, understanding what the API provides (and how to use it) is increasingly essential.

The term “headless CMS” gets used loosely enough that it has started to lose meaning in some conversations. Publishers evaluating content infrastructure deserve a clear definition, a realistic picture of the tradeoffs, and an honest sense of when the architecture is actually the right fit. What “Headless” Means A traditional CMS — WordPress, Drupal, Joomla — couples content management with content presentation. The system stores your posts in a database, applies templates to them, and renders HTML pages.

WPGraphQL is an open-source WordPress plugin that adds a fully featured GraphQL API to any WordPress installation. It transforms WordPress from a self-contained CMS into a content platform queryable by any GraphQL client — a Next.js front end, a mobile app, a Hugo build process, or any other consumer capable of making HTTP requests. The REST API built into WordPress core works, but GraphQL solves problems the REST API does not handle elegantly: over-fetching unnecessary fields, under-fetching requiring multiple round-trips, and querying relational data efficiently.