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Kustomize vs Jsonnet: catalog facts
Kustomize	Jsonnet
Free Free and open source.	Free Free and open source under the Apache 2.0 licence.
Command line	Command line
Built into kubectl as apply -k Plain YAML with no templating language	Removes duplication in config through functions and object inheritance Outputs JSON, YAML, INI and other formats
Only useful for Kubernetes configuration Layered overlays can be hard to follow in large setups	Another language for a team to learn on top of JSON or YAML Mainly useful for large or repetitive configuration
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 September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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