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Oils vs ksh 93u+m: catalog facts
Oils	ksh 93u+m
Best for: Shell script authors who want a stricter bash or a more modern shell language	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
OSH runs existing bash scripts with stricter error checking YSH adds structured data and JSON support All 4 strengths for Oils OSH runs existing bash scripts with stricter error checking YSH adds structured data and JSON support Both shells in one small binary Detailed reference documentation	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
Still before a 1.0 release YSH is a new language to learn	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 Oils oils.pub Catalog checked September 24, 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.