Is K3s or SST better?

Neither clearly leads. K3s starts at Free and SST at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, K3s or SST?

K3s starts at Free and SST at Free.

Does K3s or SST run on more platforms?

K3s runs on Linux, ARM, Self-hosted. SST runs on AWS, Cloudflare, Node.js.

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 SST is typically brought in for.

What can K3s do that SST cannot?

K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. SST covers Single config file, Resource linking, Local development, Multi-cloud support.

Cloud · head to head

K3s vs SST

K3s

Cloud

Lightweight certified Kubernetes distribution in a single binary

From: Free
Rated: -

Full review Website

SST

Cloud

Build full-stack apps on your own infrastructure

From: Free
Rated: -

Full review Website

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; SST primarily optimized for AWS with Cloudflare support
They diverge on capability: K3s covers Single binary, SST covers Single config file.

Where they differ

Only the attributes on which K3s and SST actually diverge.

Attributes where K3s and SST differ
Attribute	K3s	SST
Pricing model	Open source, no licence fee	Unknown
Platforms	Linux, ARM, Self-hosted	AWS, Cloudflare, Node.js

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 K3s

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

Only in SST

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

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 SST
Development and CI clusters that must start fast and cost nothingnot SST
Small production clusters where full Kubernetes is more operations than the workload justifiesnot SST
Teaching and learning Kubernetes without cloud spendnot SST

SST

Deploying Next.js frontends with serverless backendsnot K3s
Managing databases and storage alongside application codenot K3s
Creating staging environments for feature testingnot 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

SST

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

Pricing, plan by plan

K3s

Free

K3sFree
- Full functionality
- No usage limits
- Community support

SST

Free

No published plan breakdown. See the SST review.

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 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

Questions people ask

Is K3s or SST better?: Neither clearly leads. K3s starts at Free and SST at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, K3s or SST?: K3s starts at Free and SST at Free.
Does K3s or SST run on more platforms?: K3s runs on Linux, ARM, Self-hosted. SST runs on AWS, Cloudflare, Node.js.
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 SST is typically brought in for.
What can K3s do that SST cannot?: K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. SST covers Single config file, Resource linking, Local development, Multi-cloud support.

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.

SST: Is SST free?

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

Source

K3s: Is K3s real Kubernetes?

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

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

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.