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asdf vs ruby-build: catalog facts
asdf	ruby-build
Free Free and open source under the MIT licence.	Free Free and open source under the MIT license.
macOS, Linux, Command line	Command line
One tool and one .tool-versions file replaces nvm, rbenv, pyenv and friends Plugin ecosystem covers hundreds of runtimes and CLI tools	Installs any listed Ruby version into a chosen prefix Supports CRuby and other implementations
Shim indirection adds startup latency and occasionally confuses tooling Plugin quality varies since each is community-maintained	Must be upgraded to learn about new Ruby releases Compiles from source, which takes time
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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