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brush vs ksh 93u+m: catalog facts
brush	ksh 93u+m
Best for: Bash users curious about a Rust implementation of a familiar shell	Best for: Maintaining KornShell scripts or using ksh as a daily shell
Free Free and open source.	Free Free and open source.
Linux, Command line	macOS, Linux, Command line
Bash-compatible syntax, so existing knowledge carries over Written in Rust	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
Compatibility with Bash may not be complete Younger and less widely used than Bash	Mainly distributed as source code Smaller community than Bash or Zsh
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for brush github.com/reubeno/brush 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.