When comparing Layers vs Grav CMS, the Slant community recommends Grav CMS for most people. In the question“What is the best website builder for a portfolio site?” Grav CMS is ranked 10th while Layers is ranked 11th. The most important reason people chose Grav CMS is:
Very fast, easy to update, - has admin panel for noobies or just edit markdown files for posts.
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Pros
Pro Open source
Layers is an open source website builder. The source code is freely available on GitHub.
Pro Ability to add custom CSS
While designing a whole website without coding is possible with layers, for more advanced users who want to inject custom CSS to their website, it's possible to do so through a plugin called DevKit.
Pro Fast, easy to use
Very fast, easy to update, - has admin panel for noobies or just edit markdown files for posts.
Pro Does not use any database, a complete flat Elise CMS
Database being a point of vulnerability is completely removed from the equation with it's flat file approach.
Cons
Con Requires WordPress
Requires WordPress which is heavy and too bloated for many simple sites.
Con Not a lot of great pre-made themes available
One of the areas that Layers falls behind is the number of good themes that can be found and installed from the marketplace.
Con Not User Friendly
Require some technical knowledge to use