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Bun vs QuickJS: catalog facts
Bun	QuickJS
Free Free and open source. The runtime core is MIT licensed with some bundled components under…	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	Windows, Command line
Runtime, bundler, test runner and package manager in one executable Much faster startup and installs than the Node and npm equivalents	Very small footprint with no external dependencies Nearly complete ES2025 support
Node compatibility is good but not complete; packages using deep internals can break Younger than Node, so fewer production deployments to learn from	Interpreter rather than a JIT engine, so slower than V8 for heavy workloads Bignum extensions and the qjscalc calculator were removed
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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