Is KeystoneJS or Stainless better?

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

Which is cheaper, KeystoneJS or Stainless?

KeystoneJS starts at Free and Stainless at Free.

Does KeystoneJS or Stainless run on more platforms?

KeystoneJS runs on Node.js, Self-hosted. Stainless runs on web, api.

Can I use KeystoneJS for free?

Both have a free tier, so you can try either at no cost before committing.

What is KeystoneJS best used for?

KeystoneJS is most often used for building a headless cms with a graphql api from a typescript schema, generating a configurable admin ui for editors, adding structured rich text content with the document field. Of those, building a headless cms with a graphql api from a typescript schema and generating a configurable admin ui for editors are not what Stainless is typically brought in for.

What can KeystoneJS do that Stainless cannot?

KeystoneJS covers REST API, GraphQL API, Admin interface, Node.js. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

API Management · head to head

KeystoneJS vs Stainless

KeystoneJS

API Management

Powerful Node.js headless CMS framework and API platform

From: Free
Rated: -

Full review Website

Stainless

API Management

Generates client SDKs, API docs, and MCP servers from an OpenAPI spec

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: KeystoneJS database support is limited to PostgreSQL, MySQL and SQLite; Stainless starter and Pro plan prices are not published and require contacting the company.
They diverge on capability: KeystoneJS covers REST API, Stainless covers SDK generation.

Where they differ

Only the attributes on which KeystoneJS and Stainless actually diverge.

Attributes where KeystoneJS and Stainless differ
Attribute	KeystoneJS	Stainless
Pricing model	open-source	freemium
Platforms	Node.js, Self-hosted	web, api
Founded	2016	Unknown

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

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 KeystoneJS

REST API
GraphQL API
Admin interface
Node.js
Next.js
React
Databases
Node.js support

Only in Stainless

SDK generation
MCP server generation
Docs site generation
Webhooks and streaming support
Automated unit tests
Git integration

What people use each for

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

KeystoneJS

Building a headless CMS with a GraphQL API from a TypeScript schemanot Stainless
Generating a configurable Admin UI for editorsnot Stainless
Adding structured rich text content with the document fieldnot Stainless

Stainless

Generating typed SDKs for a public APInot KeystoneJS
Producing an MCP server from an existing OpenAPI specnot KeystoneJS
Building an API documentation site alongside client librariesnot KeystoneJS
Giving open-source APIs a free SDK generation pathnot KeystoneJS

Where each one falls short

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

KeystoneJS

Database support is limited to PostgreSQL, MySQL and SQLite
Keystone 5 is a separate legacy product documented on a different site and is not covered by the Keystone 6 docs
Upgrading requires following a dedicated Migrate to 8.0.0 guide, so major versions are not drop-in
Free support is a community Slack; enterprise-grade consulting and support is a separate paid engagement with Thinkmill and no published price

Stainless

Starter and Pro plan prices are not published and require contacting the company.
The free plan caps APIs at 25 endpoints, which excludes larger production APIs.
Overage charges apply per SDK/endpoint/month once limits are exceeded, which can make costs unpredictable at scale.

Pricing, plan by plan

KeystoneJS

Free

Open SourceFree
- Full KeystoneJS
- Community support

Stainless

Free

FreeFree
- Up to 5 generators (SDKs, docs, or MCP servers)
- 5 seats
- APIs with 25 or fewer endpoints
Starter$undefined/mo
- Unlimited generators
- Expanded seats
- Private SDKs of any size
Pro$undefined/mo
- Custom enterprise features and pricing
Enterprise$undefined/mo
- Dedicated support
- SOC 2 compliance reports
- Purchase order/invoicing with negotiable terms

Which should you pick?

Choose KeystoneJS if

You need rest api.
You want to start without paying.
You work on Node.js, Self-hosted.
You also want graphql api.

KeystoneJS review

Choose Stainless if

You need sdk generation.
You want to start without paying.
You work on web, api.
You also want mcp server generation.

Stainless review

Questions people ask

Is KeystoneJS or Stainless better?: Neither clearly leads. KeystoneJS starts at Free and Stainless at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, KeystoneJS or Stainless?: KeystoneJS starts at Free and Stainless at Free.
Does KeystoneJS or Stainless run on more platforms?: KeystoneJS runs on Node.js, Self-hosted. Stainless runs on web, api.
Can I use KeystoneJS for free?: Both have a free tier, so you can try either at no cost before committing.
What is KeystoneJS best used for?: KeystoneJS is most often used for building a headless cms with a graphql api from a typescript schema, generating a configurable admin ui for editors, adding structured rich text content with the document field. Of those, building a headless cms with a graphql api from a typescript schema and generating a configurable admin ui for editors are not what Stainless is typically brought in for.
What can KeystoneJS do that Stainless cannot?: KeystoneJS covers REST API, GraphQL API, Admin interface, Node.js. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

Answered from the vendors’ own pages

Stainless: Is there a free plan, and what are its limits?

Yes. The Free plan supports up to 5 generators, 5 seats, APIs with 25 or fewer endpoints, and 100 preview builds per month, with email support.

Source

Stainless: Who owns the generated SDK code?

The generated SDK code is owned by the customer and published by Stainless under the Apache 2.0 license.

Source

Stainless: What happens if I exceed my plan's endpoint limit?

Customers exceeding their endpoint limits are billed per SDK, per endpoint, per month for the overage.

Source

KeystoneJS vs Stainless

KeystoneJS

Stainless

The short version

Where they differ

What each one covers

Only in KeystoneJS

Only in Stainless

What people use each for

KeystoneJS

Stainless

Where each one falls short

KeystoneJS

Stainless

Pricing, plan by plan

KeystoneJS

Stainless

Which should you pick?

Choose KeystoneJS if

Choose Stainless if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on KeystoneJS

More on Stainless

Keep looking

Other head to heads