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ytt vs CUE: catalog facts
ytt	CUE
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the Apache 2.0 licence.
Windows, Command line	Windows, Command line
Structure-aware templating avoids text escaping issues Overlays patch third-party YAML without forking it	Validates JSON and YAML against constraints Reduces boilerplate in large configurations
Its own templating language takes time to learn Focused on YAML only	A new language to learn on top of existing formats Most useful for larger configuration sets
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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