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pyenv vs asdf: catalog facts
pyenv	asdf
Free Free and open source under the MIT licence.	Free Free and open source under the MIT licence.
macOS, Linux, Command line	macOS, Linux, Command line
Per-directory Python version selection that survives shell restarts Never disturbs the system Python the operating system depends on	One tool and one .tool-versions file replaces nvm, rbenv, pyenv and friends Plugin ecosystem covers hundreds of runtimes and CLI tools
Compiles from source, so it needs build dependencies and takes time Shim-based path interception occasionally confuses other tooling	Shim indirection adds startup latency and occasionally confuses tooling Plugin quality varies since each is community-maintained
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.