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Rollup vs Rspack: catalog facts
Rollup	Rspack
Best for: Bundling JavaScript libraries and custom build pipelines	Best for: Speeding up existing webpack projects without a full rewrite
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Thorough tree-shaking Many output formats including ESM, CommonJS and UMD All 4 strengths for Rollup Thorough tree-shaking Many output formats including ESM, CommonJS and UMD Simple plugin API used by Vite Code splitting without extra loader code	Compatible with webpack plugins and loaders Fast startup and incremental HMR All 4 strengths for Rspack Compatible with webpack plugins and loaders Fast startup and incremental HMR Code splitting and tree shaking built in Framework agnostic
No built-in development server More configuration than preconfigured tools like Vite	Not every webpack plugin is guaranteed to work Requires a Node.js project setup
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Rollup rollupjs.org Catalog checked October 1, 2026	Official website Full listing and sources Sources for Rspack rspack.rs Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.