Storyblok

Storyblok is also a web service, so you only need to register an account to create a project. It is more difficult to use than Contentful, but has more room for customization. In addition to the main entities, here it's possible to make auxiliary ones to use as components of the main entities. Storyblok allows grouping entities and content independently.

Also, this CMS has a unique feature. It can include your code on the frontend to see a preview of the content being created, which is important for content managers.

Of course, Storyblok has some flaws. It's not beginner-friendly, so a bit of learning is required to understand its interface. Then, it is only available in the paid version. Storyblok also has restrictions for entities, content, and files, but they are much wider than in Contentful.

Finally, Storyblok is a good CMS if you have fairly complex data structures in your project and want to fine-tune them.

Sanity

Sanity Studio is a structured content platform. It includes a real-time hosted data repository and Sanity Studio, an open-source editing environment that you can configure with JavaScript.

You may produce content with customized components using Sanity Studio to cater to certain use cases.

With the highly adaptable editor for Portable Text included with Sanity Studio, you can concentrate on the content and use presentation strategies that may be applied consistently across a project.