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Kustomize vs Spring Cloud Gateway

Kustomize logo

Kustomize

Cloud

Template-free customisation of Kubernetes YAML

From
Free
Rated
-
Full reviewWebsite
Spring Cloud Gateway logo

Spring Cloud Gateway

APIs

API gateway built on Project Reactor for building microservices

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kustomize no packaging or distribution story, which is exactly what Helm charts provide; Spring Cloud Gateway released under the Apache 2.0 license, free and open source with no commercial tier
  • They diverge on capability: Kustomize covers Overlay patching, Spring Cloud Gateway covers Routing.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Kustomize and Spring Cloud Gateway actually diverge.

Attributes where Kustomize and Spring Cloud Gateway differ
AttributeKustomizeSpring Cloud Gateway
Pricing modelOpen source, no licence feeopen-source
PlatformsKubernetes, Linux, macOS, WindowsJava, Spring Boot
CategoryCloudAPIs
FoundedUnknown1998

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

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 Kustomize

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

Only in Spring Cloud Gateway

  • Routing
  • Path Rewriting
  • Circuit Breaker
  • Spring Boot
  • Spring Security
  • Spring Cloud
  • Java support
  • Spring Boot support

What people use each for

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

Kustomize

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

Spring Cloud Gateway

  • API Developmentnot Kustomize
  • API Gatewaynot Kustomize
  • API Testingnot Kustomize
  • API Documentationnot Kustomize
  • Microservicesnot Kustomize

Where each one falls short

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

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

Spring Cloud Gateway

  • Released under the Apache 2.0 license, free and open source with no commercial tier

Pricing, plan by plan

Kustomize

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

Spring Cloud Gateway

Free
  • Open SourceFree
    • Core Spring Cloud Gateway
    • Community support

Which should you pick?

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

Choose Spring Cloud Gateway if

  • You need routing.
  • You want to start without paying.
  • You work on Java, Spring Boot.
  • You also want path rewriting.
Spring Cloud Gateway review

Questions people ask

Is Kustomize or Spring Cloud Gateway better?
Neither clearly leads. Kustomize starts at Free and Spring Cloud Gateway at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kustomize or Spring Cloud Gateway?
Kustomize starts at Free and Spring Cloud Gateway at Free.
Does Kustomize or Spring Cloud Gateway run on more platforms?
Kustomize runs on Kubernetes, Linux, macOS, Windows. Spring Cloud Gateway runs on Java, Spring Boot.
Can I use Kustomize for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kustomize best used for?
Kustomize is most often used for managing dev, staging and production variants of the same manifests, keeping manifests readable and directly applyable rather than templated, patching third-party manifests without forking them. Of those, managing dev, staging and production variants of the same manifests and keeping manifests readable and directly applyable rather than templated are not what Spring Cloud Gateway is typically brought in for.
What can Kustomize do that Spring Cloud Gateway cannot?
Kustomize covers Overlay patching, No templating language, Built into kubectl, Generators. Spring Cloud Gateway covers Routing, Path Rewriting, Circuit Breaker, Spring Boot.

Answered from the vendors’ own pages

Kustomize: Is Kustomize free?

Yes, open source and part of the Kubernetes project.

Spring Cloud Gateway: Is Spring Cloud Gateway free?

Yes, Spring Cloud Gateway is free and open-source software. It is part of the Spring ecosystem and available through GitHub repositories with open-source dependencies like spring-cloud-starter-gateway-server-webflux and spring-cloud-starter-gateway-server-webmvc.

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.

Spring Cloud Gateway: What enterprise support is available for Spring Cloud Gateway?

Tanzu Spring provides optional enterprise support including Day 0 access to security patches for organizations requiring guaranteed support, but specific pricing is not published on the Spring Cloud Gateway project page.

Source
Kustomize: Do I need to install Kustomize?

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

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