Use Helm when you want to package, share, install, upgrade and roll back Kubernetes applications as versioned charts, including the many public charts on Artifact Hub. Use Kustomize when you want to customise plain Kubernetes YAML without templates, with overlays for each environment and no extra tool beyond kubectl. They also work together: Kustomize's own site lists customising upstream Helm charts as a use case.
I read Helm's home page and its Using Helm guide, then Kustomize's home page and the Kubernetes docs page on managing objects with Kustomize. Both tame Kubernetes YAML, but one is a package manager and the other is a patching tool.
Helm and Kustomize compared
| Helm | Kustomize | |
|---|---|---|
| Type | Package manager for Kubernetes | Template-free configuration customisation |
| Unit of work | Charts, installed as releases | Plain YAML bases plus overlays |
| Templates | Yes, charts are templated | No, every artifact is plain YAML |
| Upgrades and rollback | In-place upgrades, hooks and helm rollback | Apply the changed configuration again |
| Getting it | Separate binary via Homebrew, Chocolatey, Scoop or Snap | Built into kubectl as apply -k, or a standalone binary |
| Sharing | Public and private chart repositories, Artifact Hub | Bases and overlays kept in your own repo |
| Free option (as of October 2026) | Yes, open source CNCF graduated project | Yes, open source |
What Helm is built for
Helm calls itself the way to find, share and use software built for Kubernetes. Charts define, install and upgrade even complex applications, and they're easy to version, share and host on public or private servers. Helm handles in-place upgrades with custom hooks, and helm rollback takes a release back to an older version when something breaks.
The ecosystem is the big draw. helm search hub looks across Artifact Hub, which lists charts from dozens of repositories, so you can install common software without writing its manifests yourself. Helm is a graduated project in the Cloud Native Computing Foundation, and its docs now cover Helm 4.
One handy detail from the Using Helm guide: helm search repo searches the chart repositories you've already added, and it runs over local data, so no public network connection is needed. That matters on locked-down build servers. When you want something new, helm search hub with the --list-repo-url flag shows the real repository address to add.
Why teams pick Kustomize
This tool takes a different view: no templates at all. It walks through your Kubernetes manifests to add, remove or update settings without forking them, and every file stays plain YAML that you can validate like any other. You keep a base and add overlays for each environment, so staging and production differ only where you say they should.
It's also already on your machine if you use kubectl. Kustomize has been built into kubectl through the -k flag since Kubernetes 1.14, and it's available as a standalone binary too. GitOps tools including Argo CD and Flux integrate it directly.
You don't always have to choose
Kustomize's own site lists customising upstream Helm charts with Kustomize as a use case. It's a practical pattern: use Helm to pull in a third-party application as a chart, then use Kustomize to apply your own environment-specific tweaks without forking the chart. It gives you Helm's packaging and Kustomize's clean overlays in one workflow.
How to decide
- Installing third-party software from public charts? Helm.
- Customising your own manifests per environment? Kustomize.
- Want one-command rollbacks of a release? Helm's rollback covers it.
- Prefer no templating language and plain YAML? Kustomize.
- Using Argo CD or Flux? Both work, and Kustomize is integrated directly.
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My advice on Helm or Kustomize
If you're shipping software for other people to install, or installing a lot of off-the-shelf tools yourself, Helm is the standard way to package it, and its rollbacks are worth having. If you're managing your own services across a few environments and you'd rather read plain YAML than templates, Kustomize is cleaner and it's already in kubectl. I'd happily use both: Helm for what you install, Kustomize for how you tune it.
Do you make Kubernetes or DevOps tools? Tool makers can ask to be considered for a featured place in comparisons like this one.
Frequently asked questions
Is Kustomize built into kubectl?
Yes. Kustomize's site says it's built into kubectl as apply -k, and it's also available as a standalone binary.
Does Kustomize use templates?
No. Kustomize describes itself as a template-free way to customise application configuration; every artifact is plain YAML.
Can Helm roll back a release?
Yes. Helm says you can use helm rollback to go back to an older version of a release.
Can I use Helm and Kustomize together?
Yes. Kustomize's own site lists customising upstream Helm charts with Kustomize as a use case.
Where do I find Helm charts?
Helm points to Artifact Hub, which lists charts from many public repositories. helm search hub searches it from the command line.
