Compare software

Pkl vs CUE: catalog facts
Pkl	CUE
Best for: Developers who want typed, validated configuration that outputs to common formats	Best for: Developers validating and managing large configuration and schema files
Free Free and open source under the Apache-2.0 license.	Free Free and open source under the Apache 2.0 licence.
Windows, Command line	Windows, Command line
Generates JSON, YAML, plist and properties files from one source Built-in validation constraints on values All 3 strengths for Pkl Generates JSON, YAML, plist and properties files from one source Built-in validation constraints on values Code generation for Java, Kotlin, Swift and Go	Validates JSON and YAML against constraints Reduces boilerplate in large configurations All 3 strengths for CUE Validates JSON and YAML against constraints Reduces boilerplate in large configurations Works with Protobuf and OpenAPI definitions
A new language for a team to learn Adds a generation step to existing configuration workflows	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
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Pkl pkl-lang.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for CUE cuelang.org Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.