effector vs mobx
mobx is downloaded 39.9× more often than effector (16,212,601 vs 406,673 per month), so it has the larger community and more answered questions online. effector ships 31% less gzipped JavaScript (12.3 kB vs 17.7 kB), which matters if bundle size is a priority. Both projects are actively maintained.
| Metric | effector | mobx |
|---|---|---|
| Weekly downloads | 108,584 | 3,789,180✓ |
| Monthly downloads | 406,673 | 16,212,601✓ |
| GitHub stars | 4,837 | 28,194✓ |
| Minified size | 28.9 kB✓ | 62.2 kB |
| Minified + gzipped | 12.3 kB✓ | 17.7 kB |
| Dependencies | 0 | 0 |
| Open issues | 156 | 73✓ |
| Last commit | 2026-05-13 | 2026-05-31✓ |
| Latest version | 23.4.4 | 6.15.4 |
| 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
mobx
Transparent reactive state via observables.
Choose it when: You prefer an OOP/reactive model where state updates track automatically, with minimal explicit wiring.
- + Automatic dependency tracking
- + Less explicit boilerplate
- - Magic can be hard to debug
- - Decorator/class style divides opinion
Feature comparison
| Feature | effector | mobx |
|---|---|---|
| Paradigm | Events / effects | Observables |
| First-class TypeScript | ✓ Yes | ✓ Yes |
| Works outside React | ✓ Yes | ✓ Yes |
| Dedicated devtools | ✓ Yes | ✓ Yes |
| Built-in async / server state | ✓ Yes | Manual |
| Boilerplate | Medium | Low |
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[](https://devcompare.dev/compare/effector-vs-mobx)Data from npm, Bundlephobia and GitHub. Last updated 2026-06-02.