Rollup
Rollup: A free, extensible bundler for modular JavaScript libraries and applications. Ranked #9 of 27 in JavaScript Build Tools by our editors (8.4/10); pricing: Free plan; best for library-focused module bundling.
At a glance
- Editor score8.4 / 10
- PricingFree plan
- Best forLibrary-focused module bundling
- Free planYes
- Paid fromFree
- TypeScript supportYes
- Facts checked20 Sep 2026
Where it wins
- Tree shaking helps reduce unused module code.
- Supports ES, CommonJS, UMD, and SystemJS output formats.
- Offers CLI, JavaScript API, source maps, and plugin hooks.
Where it doesn't
- Plugin-based customization can require build configuration.
- Multiple output formats add configuration choices to a build.
- Its strengths are centered on module bundling rather than a broader workflow.
Our verdict on Rollup
Rollup is an open-source JavaScript module bundler for compiling modular code into libraries or applications. It supports browser and Node.js projects and can be used through a command-line interface or JavaScript API. Its core capabilities include tree shaking, code splitting through multiple entry points and dynamic imports, source-map generation, and output in ES modules, CommonJS, UMD, and SystemJS formats. It is a strong fit for teams focused on producing library bundles or integrating module bundling into a wider JavaScript build workflow.
The product’s main strength is its balance of focused bundling features and extensibility. Tree shaking targets unused module code, while code splitting supports multiple entry points and dynamic imports. Multiple output formats help a project publish bundles for different environments, and source maps support mapped build output. Plugin hooks extend builds and allow code transformation, giving JavaScript projects a way to adapt the bundling process to their requirements. Those capabilities make Rollup particularly suitable when output control and library packaging matter more than an all-in-one development workflow.
Rollup is distributed under the MIT License and is available as free, open-source software. The published feature set includes both CLI and JavaScript API access, so teams can choose command-driven builds or programmatic integration. Its plugin model and range of output options also mean that projects may need deliberate build configuration, especially when transforming code or producing several formats. Choose Rollup when your priority is modular JavaScript bundling with tree shaking, code splitting, source maps, and extensible output. Consider an alternative if your primary need is a broader build workflow rather than a focused module bundler.
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Rollup pricing
Rollup fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| TypeScript support | Yes |
| Code splitting | Yes |
| Tree shaking | Yes |
| Source maps | Yes |
| Plugin API | Yes |
| Remote build cache | Not verified |
| Deployment | Self-hosted |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | rollupjs.org |
| Facts checked | 20 Sep 2026 |
Alternatives to Rollup
- ViteA free, open-source choice for fast development and optimized production builds.9.4
- webpackA free, open-source choice for complex builds that need detailed bundling control.9.3
- esbuildA free, open-source build tool for fast JavaScript and TypeScript workflows.9.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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