When comparing Forestry vs Netlify CMS, the Slant community recommends Netlify CMS for most people. In the question“What are the best CMSs for static sites?” Netlify CMS is ranked 2nd while Forestry is ranked 4th. The most important reason people chose Netlify CMS is:
Experimental support for GitHub's GraphQL API is now available for the GitHub backend. Without mutation.
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Pros
Pro Polished UI
The interface of the program is very minimalist and neat. There is nothing to distract you, all necessary tools are easy to find.
Pro Experimental support for GitHub's GraphQL API
Experimental support for GitHub's GraphQL API is now available for the GitHub backend. Without mutation.
Pro Easy Creating Custom Widgets option
The NetlifyCMS exposes a window.CMS global object that you can use to register custom widgets, previews, and editor plugins. The same object is also the default export if you import Netify CMS as an npm module. The available widget extension methods are listed here.
Pro Modern
Pro Open-source
Pro Built in React.js
Cons
Con A lot of configuration
Example: a few plugins and some code are needed for gatsby-img or markdown to work.