What It Is
A reactive UI library that looks like React (JSX, components, hooks-like API) but works fundamentally differently under the hood. Created by Ryan Carniato in 2018. Consistently tops performance benchmarks.
Why It Exists
SolidJS asks: what if you could have React's developer experience without the virtual DOM overhead?
React's trade-off
React re-renders entire components when state changes, then diffs virtual DOM to find what actually changed. This is wasteful — most of the component didn't change.
SolidJS's approach
Components run once. Only the specific DOM nodes that depend on changed data get updated. No virtual DOM, no diffing, no re-rendering.
// Looks like React, but only runs once
function Counter() {
const [count, setCount] = createSignal(0)
console.log("This prints ONCE, not on every update")
return <button onClick={() => setCount(count() + 1)}>
Count: {count()} {/* Only this text node updates */}
</button>
}
Strengths and Weaknesses
| Strengths | Weaknesses |
|---|---|
| Fastest benchmarks of any framework | Small community |
| React-like syntax — easy to learn from React | Very few job postings |
| No virtual DOM overhead | Ecosystem is tiny |
| Truly reactive — surgical DOM updates | Solid Start (meta-framework) is immature |
When to Use / When Not to Use
Use when: Performance is the absolute top priority, team is willing to adopt a niche tool.
Don't use when: Need ecosystem breadth, hiring ease, or battle-tested meta-framework.