Stainless

Stainless

Stainless provides developer-first tooling to generate and maintain SDKs, documentation, and MCP servers from your OpenAPI spec, aimed at delivering high-quality agent and developer experiences.

Stainless is developer tools software teams evaluate for developer tools. Use this page to review pricing, integration signals, and the best alternatives before you commit.

Contact for pricing API 70/100
#129 in Developer Tools (129 tools)
Just launched
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Quick Overview

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What it does

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Stainless

Stainless is a developer-focused platform that automates the creation of idiomatic SDKs, up-to-date documentation, and MCP (Message/Model/Controller Proxy) servers directly from an OpenAPI specification. The product is built to improve both developer experience and downstream agent experience by ensuring clients, docs, and server stubs remain consistent with the API surface. Stainless targets engineering teams and platform owners who want reliable, maintainable developer interfaces across multiple programming languages and deployment environments.

Stainless emphasizes multi-language support and tooling, offering generated artifacts and state-of-the-art MCP servers so teams can ship integrations faster and reduce manual client-library maintenance. The company has announced it is joining Anthropic to continue its mission of improving software interfaces.

Stainless provides developer-first tooling to generate and maintain SDKs, documentation, and MCP servers from your OpenAPI spec, aimed at delivering high-quality agent and developer experiences.

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Key Features

OpenAPI-driven SDK generation

Generates robust, idiomatic SDKs for multiple languages directly from your OpenAPI spec to ensure clients are consistent and idiomatic.

Automatic documentation

Documentation that stays synchronized with your API so developer docs reflect the current API surface without manual updates.

MCP servers

State-of-the-art MCP servers derived from OpenAPI to provide reliable server stubs and runtime components for agent and developer workflows.

Multi-language support

First-class support for many languages and ecosystems including TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C#, and PHP.

CLI quickstart & developer tooling

Command-line quickstarts and SDK tooling to onboard engineers quickly and integrate into CI/CD workflows.

Pricing

Claim this listing to add current pricing tiers.

Use Cases

Create and maintain SDKs

Automatically generate and publish idiomatic client libraries for multiple languages so teams don't hand-write and maintain clients.

Keep docs in sync with APIs

Generate documentation from OpenAPI to ensure developer docs always match the live API.

Provision MCP servers

Deploy server stubs and runtime components derived from OpenAPI to support agent runtime and proxy scenarios.

Speed developer onboarding

Provide consistent SDKs, docs, and quickstarts to reduce time to first call for external and internal developers.

Integrations

Cloudflare

Listed customer; likely used with Stainless for edge or CDN integration scenarios.

Letta

Listed customer; example of a company using Stainless-generated interfaces.

Lithic

Listed customer; demonstrates use by fintech or payments platforms.

Modern Treasury

Listed customer; shows applicability to financial API ecosystems.

MUX

Listed customer; example of media/video platform usage.

OpenAI

Listed customer/partner; indicates usage alongside AI platform providers.

Replicate

Listed customer; integration or usage example in ML model-serving workflows.

Turbopuffer

Listed customer; additional example of integrated tooling customers.

Weights & Biases

Listed customer; shows applicability to ML experiment tracking and model workflows.

Benefits

Reduces manual client-library maintenance by generating idiomatic SDKs from OpenAPI.
Ensures documentation and SDKs stay synchronized with the API, improving developer trust and reducing support burden.
Speeds integration and onboarding for customers and partners with multi-language support and quickstarts.

Limitations

Public pricing details are not provided on the excerpted page.
No explicit rate limit or API usage limits are shown in the available content.

Frequently Asked Questions

What input format does Stainless require to generate SDKs and servers?
Stainless generates SDKs, documentation, and MCP servers from an OpenAPI specification. You should provide a valid OpenAPI spec to derive artifacts.
Which programming languages are supported for generated SDKs?
Stainless lists first-class support for TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C#, and PHP.
How do I get started with Stainless?
You can create an account, follow the CLI quickstart, upload your OpenAPI spec, and then generate SDKs, docs, and MCP servers via the dashboard or CLI.
Is Stainless still an independent company?
The site states Stainless is joining Anthropic to continue its mission; for current company status and roadmap details, consult the announcement or company communications.

Getting Started

  1. 1 Create an account on Stainless or sign in to your existing account.
  2. 2 Prepare or upload your OpenAPI specification to Stainless.
  3. 3 Use the CLI quickstart or dashboard to generate SDKs, documentation, and MCP servers for your target languages.

Support

Docs

Documentation available via the Stainless documentation site (link referenced on the site).

Contact sales

Contact sales is listed on the site for enterprise inquiries.

CLI quickstart

Command-line quickstart resources are available to help onboard developers.

Changelog / Blog

Changelog and blog posts are listed as resources for updates and announcements.

API

Available: Yes
Documentation:

https://stainless.com/docs

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