Stainless
Generate best-in-class SDKs, docs, and MCP servers from your OpenAPI spec
About Stainless
Stainless generates production-quality SDKs, documentation, and MCP servers from your OpenAPI spec. It supports TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, and C#, with plans for Rust and Swift. Used by OpenAI, Anthropic, Meta, Cloudflare, and Runway, Stainless handles SDK publishing to package registries, versioning, and changelog generation. Its docs platform combines API reference, usage examples, and narrative guides in one cohesive experience, while MCP servers enable coding models to reliably generate code for your API.
Pros & Cons
Pros
- Trusted by industry leaders (OpenAI, Anthropic, Meta, Cloudflare) — proven at massive API scale
- Generated SDKs are genuinely idiomatic and production-quality, not just auto-generated boilerplate
- Automated publishing and versioning eliminates the manual toil of maintaining SDKs across 8+ languages
- MCP server generation is unique — enables AI coding assistants to use your API effectively
- Free tier with 5 SDKs and 25 endpoints is generous enough for startups and small APIs
Cons
- Per-SDK pricing at $99-500/month adds up quickly for APIs with many language targets
- Requires a well-structured OpenAPI spec — messy or incomplete specs produce suboptimal SDKs
- Limited to OpenAPI-based REST APIs — no native support for GraphQL or gRPC
- Relatively new platform with a small ecosystem compared to alternatives like Speakeasy
- Enterprise pricing is opaque — must contact sales for custom configurations
Key Features
Multi-Language SDK Generation
Generate idiomatic SDKs in TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, and C# from a single OpenAPI spec
Automated Publishing
Push SDK updates to npm, PyPI, Maven, and other package registries automatically as your API evolves
Docs Platform
Unified API reference, usage examples, and narrative guides that auto-update with API changes
MCP Server Generation
Generate MCP servers that enable AI coding assistants to reliably use your API
Versioning & Changelogs
Automatic semantic versioning and changelog generation for every SDK update
API Spec Validation
Catch OpenAPI spec issues before they become SDK bugs with built-in validation
Custom SDK Configuration
Control naming conventions, error handling, pagination, and retries per language target
CI/CD Integration
Integrate SDK generation into your deployment pipeline for continuous SDK delivery
Pricing
- Up to 5 SDKs
- 25 endpoints
- Community support
- Basic docs
- Public repos
- Unlimited endpoints
- Private repos
- Custom configuration
- Email support
- Auto-publishing
- All Starter features
- MCP server generation
- Advanced docs platform
- Priority support
- Custom branding
- All Pro features
- Dedicated account team
- SLA guarantees
- Custom integrations
- On-premise option
Best For
API-First Companies
Generate and maintain SDKs across all major languages as your API evolves, without a dedicated SDK team
Developer Experience
Provide developers with idiomatic, well-documented SDKs that make your API easy to integrate
AI Integration
Generate MCP servers so AI coding assistants can reliably write code that uses your API
Open Source Projects
Maintain open-source SDKs with automated publishing and changelogs from a free plan
Enterprise API Platforms
Scale SDK delivery across dozens of language targets with consistent quality and automated updates
Similar Tools
Visual Studio Code
Free, open-source code editor from Microsoft
Replicate
Run AI with an API
Qodo
AI-powered code integrity platform for automated testing and code review
Blackbox AI
AI coding assistant with 300+ models and autonomous agents
Pythagora
AI development platform that builds production-ready full-stack apps with multi-agent collaboration
1Password
The world's most-loved password manager for individuals, families, and businesses