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Python vs PyPy: catalog facts
Python	PyPy
Free Free and open source under the Python Software Foundation Licence, a permissive licence.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Readable syntax that makes it the usual first language and easy to return to The standard library covers a lot without any third-party packages	JIT compiler speeds up many pure-Python workloads Can use less memory than CPython for large programs
Much slower than compiled languages for CPU-heavy work The global interpreter lock limits threading, though recent versions are addressing it	C extensions such as NumPy run through a compatibility layer rather than natively Tracks newer Python versions behind CPython
Downloadable app	Downloadable app
Open source	Open source
License: Python-2.0	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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