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GNU Global vs Understand: catalog facts
GNU Global	Understand
Free Free software under the GNU GPL.	Paid Commercial software with a free trial.
Windows, Linux, Command line	macOS
Finds references as well as definitions Works across Emacs, Vi, shell and browser	Cross-references, call trees and dependency analysis Many graph types with plugin support and export
Built-in parser covers only a few languages Designed mainly for POSIX systems	Paid after the trial More than most small projects need
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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