openElement occupies a specific niche: a Web Components-native fullstack framework with a JSX-first authoring layer. Other tools are adjacent or solve a different slice of the problem.
A Web Components authoring library. Use Lit when you need standalone components; use openElement when you need a fullstack app lifecycle around those components.
A compiler and design-system production tool. Use Stencil to ship a component library; use openElement to build the application that consumes it.
The closest fullstack Web Components peer, but HTML-first. Choose Enhance if you prefer HTML templates; choose openElement if you prefer JSX and islands-driven hydration.
Adjacent app frameworks. Astro is content-first and treats Web Components as one integration; Fresh is Preact-first. Choose openElement when Web Components are the primary app primitive.