When would you use React Context vs Zustand vs Redux for state management?

Question

At a growing startup: "Started with useState, then Context, now need more. Team split between Redux and Zustand."

Interview OS Community · Accepted Answer

## State Management Spectrum

| Solution | Best For |
|----------|----------|
| useState/useReducer | Component-level |
| Context + useReducer | Theme, auth (changes infrequently) |
| Zustand | Medium apps, shared state |
| Redux Toolkit | Large teams, complex state |

**Context problem**: Re-renders ALL consumers on any change.

**Zustand** (recommended for Interview OS):
```tsx
const useStore = create((set) => ({
  applications: [],
  addApp: (app) => set(s => ({ applications: [...s.applications, app] })),
}));
const apps = useStore(s => s.applications); // Selective re-render
```

No providers needed, minimal boilerplate, great DX. Only use Redux if you need DevTools tracing or team has Redux experience.

Interview OS

When would you use React Context vs Zustand vs Redux for state management?

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State Management Spectrum

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