effector vs valtio
valtio is downloaded 16.0× more often than effector (6,521,315 vs 406,673 per month), so it has the larger community and more answered questions online. valtio ships 79% less gzipped JavaScript (2.5 kB vs 12.3 kB), which matters if bundle size is a priority. Both projects are actively maintained.
| Metric | effector | valtio |
|---|---|---|
| Weekly downloads | 108,584 | 1,718,838✓ |
| Monthly downloads | 406,673 | 6,521,315✓ |
| GitHub stars | 4,837 | 10,187✓ |
| Minified size | 28.9 kB | 6.0 kB✓ |
| Minified + gzipped | 12.3 kB | 2.5 kB✓ |
| Dependencies | 0✓ | 1 |
| Open issues | 156 | 5✓ |
| Last commit | 2026-05-13 | 2026-06-01✓ |
| Latest version | 23.4.4 | 2.3.2 |
| License | MIT | MIT |
When to choose which
effector
Reactive logic from events, stores and effects.
Choose it when: Complex reactive business logic you want strongly typed and framework-agnostic, decoupled from the view.
- + Powerful reactive primitives
- + Excellent TypeScript
- + Framework-agnostic
- - Smaller community
- - New vocabulary to learn
valtio
Mutate a proxy, React re-renders.
Choose it when: You want to write plain mutable updates (state.count++) and get reactivity for free, with a tiny footprint.
- + Mutable, intuitive updates
- + Tiny
- + Suspense support
- - Proxy magic can surprise
- - Smaller ecosystem
Feature comparison
| Feature | effector | valtio |
|---|---|---|
| Paradigm | Events / effects | Proxy / mutable |
| First-class TypeScript | ✓ Yes | ✓ Yes |
| Works outside React | ✓ Yes | ✓ Yes |
| Dedicated devtools | ✓ Yes | ✓ Yes |
| Built-in async / server state | ✓ Yes | ✓ Yes |
| Boilerplate | Medium | Low |
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[](https://devcompare.dev/compare/effector-vs-valtio)Data from npm, Bundlephobia and GitHub. Last updated 2026-06-02.