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Config File Validator vs CUE: catalog facts
Config File Validator	CUE
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux, Command line	Windows, Command line
Validates 18 formats with one command Schema validation with automatic SchemaStore lookup	Validates JSON and YAML against constraints Reduces boilerplate in large configurations
Automatic fixes cover only some problems Formatting checks apply to a subset of the supported formats	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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