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Bun vs Jest: catalog facts
Bun	Jest
Free Free and open source. The runtime core is MIT licensed with some bundled components under…	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Runtime, bundler, test runner and package manager in one executable Much faster startup and installs than the Node and npm equivalents	Works without configuration on most projects Built-in mocking, snapshots and coverage
Node compatibility is good but not complete; packages using deep internals can break Younger than Node, so fewer production deployments to learn from	Limited to JavaScript and TypeScript projects Unit testing only; browser end-to-end tests need another tool
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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