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yash vs ksh 93u+m: catalog facts
yash	ksh 93u+m
Best for: Users who want a POSIX-compliant shell for portable scripting and daily use	Best for: Maintaining KornShell scripts or using ksh as a daily shell
Free Free and open source.	Free Free and open source.
macOS, Linux, Command line	macOS, Linux, Command line
Close adherence to the POSIX shell standard Interactive line editing All 3 strengths for yash Close adherence to the POSIX shell standard Interactive line editing Useful for testing portable shell scripts	Keeps the original KornShell 93 alive with ongoing fixes Compatible with existing ksh93 scripts All 3 strengths for ksh 93u+m Keeps the original KornShell 93 alive with ongoing fixes Compatible with existing ksh93 scripts Published releases plus a development branch
Smaller ecosystem of plugins and configurations than bash or zsh Not a terminal emulator; it runs inside one	Mainly distributed as source code Smaller community than Bash or Zsh
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for yash github.com/magicant/yash Catalog checked October 2, 2026	Official website Full listing and sources Sources for ksh 93u+m github.com/ksh93/ksh Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.