Keystatic vs Mattrbld

Keystatic makes Markdown, JSON, and YAML content in a codebase editable through an admin interface or directly in files. It also supports Markdoc and MDX, with integration guides for Astro, Next.js, and Remix. Content can be stored locally, in GitHub, or in both locations, and the product is described as requiring no database. Keystatic Cloud connects to GitHub so team members can edit without individual GitHub accounts. Teams can contain multiple projects, while every user on a team can access all of them. Optional Cloud Images stores, optimizes, and delivers images for websites. Cloud Pro adds experimental real-time multi-person editing on one document. The Reader API retrieves project-directory data. A free plan allows up to three users per team with unlimited teams and projects. Cloud Pro costs $10.00 per month, plus $5.00 per month for each additional user beyond three. The project is experimental.

Mattrbld is a Git-based headless CMS for creating and managing content without tying editors to a particular frontend framework. Content remains in Git repositories rather than on Mattrbld’s external servers. After importing a project, users can edit offline, but must reconnect to publish changes. Schemas define content fields and validation rules, which Mattrbld uses to create editing forms. It supports JSON and Markdown files with YAML frontmatter; plain YAML support is planned but not implemented. Developers can implement a preview route using Mattrbld’s protocol to show content updates in real time. Repository communication uses Git; its documentation names GitLab, GitHub, and Bitbucket as providers that require a CORS proxy. Mattrbld does not require its own account, but collaborators need Git-provider accounts to access private repositories or sync. It is free, with an official hosted instance and a self-hosted core. The hosted instance has no availability guarantee, and its provided CORS proxy is intended for small-scale private projects. Mattrbld can also be built from source and hosted as a single-page application.