The Layers interface works through the WordPress Customizer, so it looks, feels, and works like an extension of WordPress. What’s more, the Obox team has released their source code so that anyone can extend and contribute to Layers. I see a lot of potential with this project as it’s looking to “play well” within the overall WordPress community.
By removing endless design options and features, Layers provides you with just enough choice to create a beautiful site while still maintaining the fundamentals of good design. ~ Layers – WordPress Site Builder