Astro Islands

Astro Islands (aka Component Islands) are a pattern of web architecture pioneered by Astro. The idea of “islands architecture” was first coined by Etsy’s frontend architect Katie Sylor-Miller in 2019, and expanded on in this post by Preact creator Jason Miller.

What is an Astro Island?

The term “Astro Island” refers to an interactive UI component on an otherwise static page of HTML. Multiple islands can exist on a page, and an island always renders in isolation. Think of them as islands in a sea of static, non-interactive HTML.