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asdf vs GHCup: catalog facts
asdf	GHCup
Free Free and open source under the MIT licence.	Free Free and open source.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
One tool and one .tool-versions file replaces nvm, rbenv, pyenv and friends Plugin ecosystem covers hundreds of runtimes and CLI tools	One tool for GHC, Cabal, Stack and HLS Switch between toolchain versions
Shim indirection adds startup latency and occasionally confuses tooling Plugin quality varies since each is community-maintained	Default install relies on piping a script into a shell Only useful for Haskell development
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: LGPL-3.0
Not stated if an account is needed	No account 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 24, 2026

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