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Documentation · head to head

Bump.sh vs Stainless

Bump.sh logo

Bump.sh

Documentation

Hosted API documentation that diffs each new spec against the last and publishes a human readable changelog

From
On request
Rated
-
Full reviewWebsite
Stainless logo

Stainless

APIs

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Stainless has a free tier, so it costs nothing to try first.
  • Each has a real cost: Bump.sh the service is hosted only, so organisations that cannot send their API specification to a third party are excluded regardless of how well the diff works.; Stainless starter and Pro plan prices are not published and require contacting the company.
  • They diverge on capability: Bump.sh covers Structural spec diff, Stainless covers SDK generation.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Bump.sh and Stainless actually diverge.

Attributes where Bump.sh and Stainless differ
AttributeBump.shStainless
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWebweb, api
CategoryDocumentationAPIs

Identical on both: 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 Bump.sh

  • Structural spec diff
  • Published changelog
  • AsyncAPI support
  • CI integration
  • Multi API hubs
  • Custom domain and branding
  • Access control

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.

Bump.sh

  • A public API with paying consumers where an accidental breaking change carries contractual consequencesnot Stainless
  • An event driven platform that needs AsyncAPI documentation rather than REST only toolingnot Stainless
  • A pull request gate that must fail when a spec change breaks an existing clientnot Stainless
  • A partner portal grouping several internal APIs behind access control on a custom domainnot Stainless

Stainless

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

Where each one falls short

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

Bump.sh

  • The service is hosted only, so organisations that cannot send their API specification to a third party are excluded regardless of how well the diff works.
  • Long form guides and tutorials are secondary to the reference, so most teams still run and pay for a second documentation site.
  • Diff quality depends on spec quality, and a specification generated loosely from code annotations produces noisy change reports that teams learn to ignore.
  • It is a small European vendor in a category where larger competitors bundle documentation with gateways and portals, so procurement at a large enterprise can take longer than the evaluation did.
  • Because pricing is not something a buyer can confirm without contact, budgeting for it early in a comparison is guesswork.

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

Bump.sh

On request
  • Bump.sh$undefined/year
    • Hosted API documentation portal
    • Automatic breaking change detection
    • Consumer facing changelog

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 Bump.sh if

  • You need structural spec diff.
  • You also want published changelog.
Bump.sh 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 Bump.sh or Stainless better?
Neither clearly leads. Bump.sh starts at On request and Stainless at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bump.sh or Stainless?
Stainless has a free tier; the other does not. Paid plans start at On request for Bump.sh and Free for Stainless.
Does Bump.sh or Stainless run on more platforms?
Bump.sh runs on Web. Stainless runs on web, api.
Can I use Stainless for free?
Yes. Stainless has a free tier, so you can try it without paying. Bump.sh starts at On request.
What is Bump.sh best used for?
Bump.sh is most often used for a public api with paying consumers where an accidental breaking change carries contractual consequences, an event driven platform that needs asyncapi documentation rather than rest only tooling, a pull request gate that must fail when a spec change breaks an existing client, a partner portal grouping several internal apis behind access control on a custom domain. Of those, a public api with paying consumers where an accidental breaking change carries contractual consequences and an event driven platform that needs asyncapi documentation rather than rest only tooling are not what Stainless is typically brought in for.
What can Bump.sh do that Stainless cannot?
Bump.sh covers Structural spec diff, Published changelog, AsyncAPI support, CI integration. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

Answered from the vendors’ own pages

Bump.sh: What does it do that a normal API docs renderer does not?

It compares each published spec with the previous one and tells you, and your consumers, exactly what changed and whether it breaks clients.

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
Bump.sh: Does it support event driven APIs?

Yes. AsyncAPI is a first class input alongside OpenAPI, which is unusual in this category.

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
Bump.sh: Can I self host it?

No. It is a hosted service only.

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
Bump.sh: Can it block a merge?

Yes. The command line tool and GitHub action return a failure on a detected breaking change.

Bump.sh: Is it a full documentation site?

It is primarily reference and changelog. Plan on a separate generator for guides and conceptual content.

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