Automad

vs

Contentful

Kirby is a flat file content management system written in PHP. Kirby adapts to any project and can be used by developers, designers, creators and clients to create websites for businesses and personal use.

Grav is a modern free and open source flat-file content management system. With Grav, you can publish content and build sites in a fast, flexible and simple manner with the file-based web platform. Grav requires zero installation and is just an zip archive that can be extracted to start using the CMS. Grave also comes with a powerful package management system that allow you to extend the feature set of Grav CMS. With the package management system you can install and upgrade themes and plugins written specifically for Grav. The software is written in PHP and released fully free and open-source under the MIT License.

Flextype is super fast headless content management system with an elegant architecture and built-in smart cache.

A hybrid content management system that includes classic CMS and Headless CMS features. With dotCMS content managers can create content that fuels the brand experience. The API-first approach provided by the headless part of dotCMS allows developers to build extremely fast front-ends with popular third-party front-end framework and deliver content optimally. The content management system allows content creators to build engaging and memorable content that can be reused across sites.

Squidex is 100% open source headless CMS, built by passionated developers. With Squidex both individuals and organizations can handle content for the new web with ease. Squidex modular platform allows users to create content APIs that can be consumed by any frontend framework or technology in a matter of minutes. The framework itself can also be extended and tweaked to suite individual use-cases. Squidex is provided as a fully open source software released and free of charge, for the self-hosted community edition. For organizations that want to get up and running fast, commercially hosted solutions are provided.

Prismic is a commercial headless CMS and content (Content-as-a-Service) platform. With Prismic you can get your backend infrastructure and API up in the matter of minutes, so that you can focus on building the frontend that will be shown to your readers. The feature rich backend content management system provided by Prismic is free to use for one admin, and commercially provided to organizations with large content management teams.