React
The reference UI framework. React 19 with Server Components is a game changer.
Strengths
- Native concurrent features: Suspense, transitions, async actions without external libs
- Massive ecosystem: TanStack, shadcn, Zustand, millions of compatible libs
- use() hook unifies Promise and Context reading, less async boilerplate
- React Compiler (opt-in) eliminates manual memo/useCallback via static analysis
Limitations
- React Server Components require Next.js or Remix, incompatible with pure Vite SPA
- Steep learning curve for concurrent patterns (Suspense, transitions)
- React Compiler still experimental in 2026, early adoption carries bug risk
Best for
- Complex SPAs, dashboards, enterprise applications
- Design systems paired with Supabase / Convex backend