Cosmic.js is a CaaS based on GraphQL. It follows on the footsteps of both Contentful and GraphCMS.
Cosmic.js already has an impressive roster of users from multinational companies as well as trendy startups. It is a great option for getting started quick with a Content as a Service (CaaS) platform, but falls short for enterprise grade requirements. Cosmic.js does not provide a free tier.
Like other pure CaaS players in the market the service is built with proprietary technologies that provide tight lock in and no capability of introducing own field types or other customisations like Drupal or eZ Platform enable. In addition the pricing scales out of hand when working with large content archives.