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Ninja vs tup: catalog facts
Ninja	tup
Free Free and open source.	Free Free and open source under GPL-2.0-only.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Very fast incremental builds Works as a CMake backend	Tracks file changes against a dependency graph Avoids rebuilding unaffected outputs
Build files are not convenient to write by hand Needs a higher-level generator for most projects	macOS requires a FUSE implementation
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-2.0-only
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 September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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