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Kustomize vs ytt

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Kustomizeytt
LanguageGoGo
LicenceApache-2.0Apache-2.0
Stars12k1.9k
Latestkustomize/v5.8.3v0.55.3
Last push2026-10-182026-10-15
Release cadenceabout 1 day between releasesabout 29 days between releases
Active contributors6 commit authors on the default branch in the last 90 days8 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • ytt replaces Kustomize. Alternatives to Kustomize →

    PartialOverlays on YAML with a programmable template language, with a steeper learning curve.

  • Both replace Helm. Alternatives to Helm →

    PartialKustomizePatches plain YAML with overlays instead of templating it, and does not track releases or package charts.

    PartialyttTemplates YAML with a structure-aware overlay language, without chart packaging or release tracking.