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K3s vs Spring Cloud Gateway

K3s logo

K3s

Cloud

Lightweight certified Kubernetes distribution in a single binary

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: K3s the SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity; Spring Cloud Gateway released under the Apache 2.0 license, free and open source with no commercial tier
  • They diverge on capability: K3s covers Single binary, Spring Cloud Gateway covers Routing.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which K3s and Spring Cloud Gateway actually diverge.

Attributes where K3s and Spring Cloud Gateway differ
AttributeK3sSpring Cloud Gateway
Pricing modelOpen source, no licence feeopen-source
PlatformsLinux, ARM, Self-hostedJava, 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 K3s

  • Single binary
  • SQLite by default
  • Certified conformant
  • Batteries included
  • Low resource footprint
  • Simple install

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.

K3s

  • Kubernetes on edge sites and IoT hardware where full clusters will not fitnot Spring Cloud Gateway
  • Development and CI clusters that must start fast and cost nothingnot Spring Cloud Gateway
  • Small production clusters where full Kubernetes is more operations than the workload justifiesnot Spring Cloud Gateway
  • Teaching and learning Kubernetes without cloud spendnot Spring Cloud Gateway

Spring Cloud Gateway

  • API Developmentnot K3s
  • API Gatewaynot K3s
  • API Testingnot K3s
  • API Documentationnot K3s
  • Microservicesnot K3s

Where each one falls short

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

K3s

  • The SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity
  • Bundled components such as Traefik are opinionated defaults that larger teams often strip out and replace
  • Removed in-tree cloud provider integrations mean cloud-specific features need external controllers
  • Aimed at small and edge clusters, so very large deployments are better served by a standard distribution

Spring Cloud Gateway

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

Pricing, plan by plan

K3s

Free
  • K3sFree
    • Full functionality
    • No usage limits
    • Community support

Spring Cloud Gateway

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

Which should you pick?

Choose K3s if

  • You need single binary.
  • You want to start without paying.
  • You work on Linux, ARM, Self-hosted.
  • You also want sqlite by default.
K3s 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 K3s or Spring Cloud Gateway better?
Neither clearly leads. K3s 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, K3s or Spring Cloud Gateway?
K3s starts at Free and Spring Cloud Gateway at Free.
Does K3s or Spring Cloud Gateway run on more platforms?
K3s runs on Linux, ARM, Self-hosted. Spring Cloud Gateway runs on Java, Spring Boot.
Can I use K3s for free?
Both have a free tier, so you can try either at no cost before committing.
What is K3s best used for?
K3s is most often used for kubernetes on edge sites and iot hardware where full clusters will not fit, development and ci clusters that must start fast and cost nothing, small production clusters where full kubernetes is more operations than the workload justifies, teaching and learning kubernetes without cloud spend. Of those, kubernetes on edge sites and iot hardware where full clusters will not fit and development and ci clusters that must start fast and cost nothing are not what Spring Cloud Gateway is typically brought in for.
What can K3s do that Spring Cloud Gateway cannot?
K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. Spring Cloud Gateway covers Routing, Path Rewriting, Circuit Breaker, Spring Boot.

Answered from the vendors’ own pages

K3s: Is K3s free?

Yes. K3s is open source with no licence fee. SUSE sells commercial support around Rancher separately.

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
K3s: Is K3s real Kubernetes?

Yes. It is CNCF-certified conformant, so standard manifests, kubectl and Helm charts work without modification.

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
K3s: Why is K3s smaller than Kubernetes?

It strips legacy, alpha and in-tree cloud provider code, packages everything as one binary, and defaults to SQLite instead of etcd.

K3s: Can K3s run in production?

Yes, and it does, particularly at the edge and for small clusters. For a highly available control plane you need to move off the SQLite default to etcd or an external datastore.

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