Is SST or K3s better?

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

Which is cheaper, SST or K3s?

SST starts at Free and K3s at Free.

Does SST or K3s run on more platforms?

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

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 K3s is typically brought in for.

What can SST do that K3s cannot?

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

Cloud · head to head

SST vs K3s

SST

Cloud

Build full-stack apps on your own infrastructure

From: Free
Rated: -

Full review Website

K3s

Cloud

Lightweight certified Kubernetes distribution in a single binary

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: SST primarily optimized for AWS with Cloudflare support; K3s the SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity
They diverge on capability: SST covers Single config file, K3s covers Single binary.

Where they differ

Only the attributes on which SST and K3s actually diverge.

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

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 K3s

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

What people use each for

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

SST

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

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

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

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

Pricing, plan by plan

SST

Free

No published plan breakdown. See the SST review.

K3s

Free

K3sFree
- 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 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

Questions people ask

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

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

K3s: Is K3s free?

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

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: Is K3s real Kubernetes?

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

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.