React vs SolidJS

React and SolidJS look similar on the surface because both use JSX, but their rendering engines are fundamentally different. React relies on a virtual DOM and component re-renders, while SolidJS uses fine-grained signals and never re-runs components. That single difference cascades through performance, mental models, and ecosystem.

Key Differences

React builds UI from components that re-render when state changes. A virtual DOM diff determines what to update in the real DOM. Hooks like useState and useEffect manage state and side effects, with dependency arrays controlling when effects run. This model is well understood and supported by the largest ecosystem in frontend development, but it requires care to avoid unnecessary re-renders.

SolidJS also uses JSX, but components execute once to set up reactive bindings. Updates flow through signals directly to the affected DOM nodes, with no virtual DOM and no component re-execution. The result is excellent performance and predictable, fine-grained updates. SolidStart is the meta-framework, offering routing and server rendering, though it is younger than React's options.

The mental models differ in ways that matter day to day. In React, you think in terms of components re-rendering and managing dependencies. In SolidJS, you think in terms of signals and effects that track exactly what they read. Developers must internalize that Solid components do not re-run, which is liberating once learned but initially surprising for React veterans.

The practical trade-off is ecosystem and familiarity versus raw performance and a cleaner reactivity model. React's community, libraries, documentation, and hiring pool are unmatched. SolidJS offers a compelling performance story and a model some developers find simpler once they adapt.

When to Choose React

Choose React when ecosystem breadth, hiring, and mature meta-frameworks matter. It is the safe default for most teams, with extensive libraries, documentation, and community support. Its concurrent features keep performance competitive for typical applications, and the abundance of talent reduces project risk.

When to Choose SolidJS

Choose SolidJS when rendering performance is a priority and your team likes JSX but wants signal-based reactivity. It shines in highly interactive UIs where minimizing unnecessary work is valuable, such as data-dense dashboards or real-time interfaces. Be prepared for a smaller ecosystem and newer tooling.

Verdict

React wins on ecosystem, hiring, and maturity; SolidJS wins on fine-grained performance and a clean reactive model. For most teams, React is the pragmatic choice, while SolidJS rewards those who prioritize performance and enjoy its model. The decision hinges on whether ecosystem safety or performance and elegance matter more.