Strapi CMS

The backend of Strapi CMS is connected to your front end through an API. Strapi CMS is a free, open-source headless CMS. It's a service that's open-source and cost-free for developers.

You don't need to think twice while creating your content kinds because the Strapi interface is so simple to use. With Strapi, you can easily update the code in your code editor to customize your API to meet your needs.

The distribution of material (text, photos, video, etc.) across all devices may also be streamlined by content editors using Strapi.

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.