Softwr

Cloud · head to head

SST vs Kustomize

SST logo

SST

Cloud

Build full-stack apps on your own infrastructure

From
Free
Rated
-
Full reviewWebsite
Kustomize logo

Kustomize

Cloud

Template-free customisation of Kubernetes YAML

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: SST primarily optimized for AWS with Cloudflare support; Kustomize no packaging or distribution story, which is exactly what Helm charts provide
  • They diverge on capability: SST covers Single config file, Kustomize covers Overlay patching.

Where they differ

Only the attributes on which SST and Kustomize actually diverge.

Attributes where SST and Kustomize differ
AttributeSSTKustomize
Pricing modelUnknownOpen source, no licence fee
PlatformsAWS, Cloudflare, Node.jsKubernetes, Linux, macOS, Windows

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Cloud).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in SST

  • Single config file
  • Resource linking
  • Local development
  • Multi-cloud support
  • Multiple deployment stages
  • VPC tunneling

Only in Kustomize

  • Overlay patching
  • No templating language
  • Built into kubectl
  • Generators

What people use each for

The jobs each tool is most often brought in to do.

SST

  • Deploying Next.js frontends with serverless backendsnot Kustomize
  • Managing databases and storage alongside application codenot Kustomize
  • Creating staging environments for feature testingnot Kustomize

Kustomize

  • Managing dev, staging and production variants of the same manifestsnot SST
  • Keeping manifests readable and directly applyable rather than templatednot SST
  • Patching third-party manifests without forking themnot SST

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

SST

  • Primarily optimized for AWS with Cloudflare support
  • Learning curve for developers unfamiliar with infrastructure concepts
  • Limited documentation for some advanced use cases

Kustomize

  • No packaging or distribution story, which is exactly what Helm charts provide
  • Deeply nested overlays become hard to follow, and reasoning about the final output requires building it
  • No release lifecycle: nothing tracks what is installed or supports rollback the way Helm does
  • Patch syntax is fiddly for anything beyond simple field replacement

Pricing, plan by plan

SST

Free

No published plan breakdown. See the SST review.

Kustomize

Free
  • KustomizeFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose SST if

  • You need single config file.
  • You want to start without paying.
  • You work on AWS, Cloudflare, Node.js.
  • You also want resource linking.
SST review

Choose Kustomize if

  • You need overlay patching.
  • You want to start without paying.
  • You work on Kubernetes, Linux, macOS, Windows.
  • You also want no templating language.
Kustomize review

Questions people ask

Is SST or Kustomize better?
Neither clearly leads. SST starts at Free and Kustomize at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, SST or Kustomize?
SST starts at Free and Kustomize at Free.
Does SST or Kustomize run on more platforms?
SST runs on AWS, Cloudflare, Node.js. Kustomize runs on Kubernetes, Linux, macOS, Windows.
Can I use SST for free?
Both have a free tier, so you can try either at no cost before committing.
What is SST best used for?
SST is most often used for deploying next.js frontends with serverless backends, managing databases and storage alongside application code, creating staging environments for feature testing. Of those, deploying next.js frontends with serverless backends and managing databases and storage alongside application code are not what Kustomize is typically brought in for.
What can SST do that Kustomize cannot?
SST covers Single config file, Resource linking, Local development, Multi-cloud support. Kustomize covers Overlay patching, No templating language, Built into kubectl, Generators.

Answered from the vendors’ own pages

SST: Is SST free?

Yes, SST is open source and free. You only pay for cloud resources from AWS and other providers.

Source
Kustomize: Is Kustomize free?

Yes, open source and part of the Kubernetes project.

SST: What cloud providers does SST support?

SST supports over 150 providers through built-in AWS and Cloudflare components, plus Pulumi and Terraform providers.

Source
Kustomize: Kustomize or Helm?

Kustomize patches plain YAML and keeps bases readable; Helm templates and packages applications with a release lifecycle. Many teams use both — Helm to install third-party charts, Kustomize to patch them.

Kustomize: Do I need to install Kustomize?

No. It is built into kubectl, available through kubectl apply -k.

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