When comparing Gridly 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 Gridly is ranked 18th. The most important reason people chose Flextype is:
Define unlimited custom fields for any of your entries.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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 really open-source
Although there are some repositories on Github, it does not seem to be fully open-source.
Con Same CMS repackaged
Same CMS that got regurgitated over and over for years.