Comparison
Helm vs Kustomize
Helm vs Kustomize: templating vs overlays, packaging, rollback, and when to use each for Kubernetes manifests.
In short — Both turn base Kubernetes YAML into environment-specific output, but from opposite directions: Helm templates values into charts; Kustomize patches a plain-YAML base with overlays. They are frequently used together.
| Helm | Kustomize | |
|---|---|---|
| Model | Go-template + values.yaml | Declarative patches/overlays |
| Packaging | Versioned charts, shareable | No packaging — plain directories |
| Releases | Tracks installs, rollback built in | None — apply is stateless |
| Dependencies | Subcharts and repos | Component references only |
| Learning curve | Templating quirks, whitespace | Gentle — it is just YAML |
| Built into kubectl | No — separate binary | Yes — kubectl apply -k |
| Best for | Distributing apps to others | Owning your own env variants |
Which should you use?
Use Helm to package and distribute an application (especially third-party software) with versioning and rollback. Use Kustomize when you own the manifests and just need clean per-environment overlays. A common pattern: render a Helm chart, then post-process with Kustomize.