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Jest vs Bun: catalog facts
Jest	Bun
Free Free and open source.	Free Free and open source. The runtime core is MIT licensed with some bundled components under…
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Works without configuration on most projects Built-in mocking, snapshots and coverage	Runtime, bundler, test runner and package manager in one executable Much faster startup and installs than the Node and npm equivalents
Limited to JavaScript and TypeScript projects Unit testing only; browser end-to-end tests need another tool	Node compatibility is good but not complete; packages using deep internals can break Younger than Node, so fewer production deployments to learn from
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 October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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