The most comprehensive list of customizer compatible websites last updated on Aug 1 2023. Stats collected from various trackers included with free apps.
custom-layout Looking for a WordPress theme that's fast, elegant & customizable? Meet Astra! It's customizer powered, SEO friendly and compatible with major page builders.
shock + bypeople Wordpress theme generator: Create unlimited themes by changing, combining (or uploading) any design element, you can save it for later edition and/or download it both in WordPress or HTML/CSS