Headless CMS
Structured content for your apps.
Ask where the content should live before you compare editors. Contentful and Sanity keep it in a hosted API you query; Payload and Directus put it in a database you run; Keystatic, Tina and Decap CMS commit it to your repo as files. That third option removes a vendor from the picture but asks non-technical editors to work against a git repo, which some of them will hate.
Editor's pick
Payload is worth a spike if you already run a React codebase. It lives inside that codebase against your own database, so the CMS stops being a separate service to keep in sync.