What builders add
Builders typically add layout controls, reusable modules or blocks, responsive settings and richer styling interfaces.
Theme vs page builder
A theme establishes much of the site’s default presentation; a page builder controls page composition. Some ecosystems, including Divi, combine theme and builder capabilities.
Theme builders
Theme-building features extend visual editing to repeatable templates such as headers, footers, posts, archives and products.
Do you need one?
Use a dedicated builder when its workflow saves more time than it adds in dependency and maintenance. Native blocks may be enough for simpler sites.