When comparing GraphCMS vs Flextype, the Slant community recommends Flextype for most people. In the question“What are the best open source headless CMS's?” Flextype is ranked 2nd while GraphCMS is ranked 11th. The most important reason people chose Flextype is:
Define unlimited custom fields for any of your entries.
Specs
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Pros
Pro Webhooks
Webhooks enable you to trigger custom code as soon as your content changes.
Pro Image processing
On-the-fly image transformations, such as resizing or cropping just by adding parameters to your media´s URL.
Pro Roles and permissions
The roles and permissions feature allows you to assign your collaborators different roles, such as Developer, Editor and Collaborator.
Pro Multi-project management
You can manage multiple projects and create up to 50 users per account to help manage those projects.
Pro Dynamic Content Types
Define unlimited custom fields for any of your entries.
Pro Free
MIT-licensed open source project and completely free to use.
Pro No external DB required
Pro Built-in REST API
Provides APIs organized around Representational State Transfer (REST) for working with content.
Pro Version Control
It is easy to version control all content in Flextype with GIT or any other Version Control System.
Pro Flexible
Simple but powerful Core API's.
Pro Super Fast
Elegance architecture and built-in smart cache.
Pro Tokenized API
Cons
Con Not open source
Con No content versioning
Con Same CMS repackaged
Same CMS that got regurgitated over and over for years.