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Dhall vs Pkl: catalog facts
Dhall	Pkl
Best for: Teams that want typed, reusable configuration instead of copied YAML or JSON	Best for: Developers who want typed, validated configuration that outputs to common formats
Free Free and open source under the BSD-3-Clause license.	Free Free and open source under the Apache-2.0 license.
Windows, Command line	Windows, Command line
Types and functions catch configuration mistakes before deployment Converts to JSON and YAML All 4 strengths for Dhall Types and functions catch configuration mistakes before deployment Converts to JSON and YAML Semantic hashes and diffs help verify refactors Integrations for several programming languages	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
A new language for a team to learn Adds a conversion step if tools expect plain YAML or JSON	A new language for a team to learn Adds a generation step to existing configuration workflows
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Dhall dhall-lang.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for Pkl pkl-lang.org Catalog checked October 2, 2026

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