Speakeasy

Speakeasy

Speakeasy is the AI-powered API SDK generator that turns OpenAPI specifications into production-grade SDKs across 10 languages — TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, Terraform, and more. Speakeasy is widely adopted by API-first companies that need to ship SDKs alongside their REST endpoints without maintaining 10 separate codebases. Speakeasy raised approximately $20M+ Series A led by Andreessen Horowitz.

Production credibility: Approximately $20M+ Series A led by Andreessen Horowitz with FirstMark Capital and other investors participating. Founded 2022 by Sagar Batchu and Simon Marlow (both ex-Apollo GraphQL). Customers include Vercel, Mistral, Codat, Snyk, Vapi, and many API-first companies. OpenAPI-driven SDK generation in 10 languages with active code generation maintenance for spec evolution.

Key Features

• AI-powered OpenAPI-to-SDK generation in 10 languages — TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, Terraform, more
• Automatic SDK regeneration when API specs change — keeps SDKs in sync
• Founded 2022 by Sagar Batchu and Simon Marlow (both ex-Apollo GraphQL)
• $20M+ Series A led by Andreessen Horowitz with FirstMark Capital
• Customers include Vercel, Mistral, Codat, Snyk, Vapi, and many API-first companies
• Code quality output that passes language-specific linting and idiomatic conventions
• Replaces manual SDK maintenance teams at API companies shipping in 5+ languages

Ideal Use Case

API-first companies (developer tools, fintech APIs, AI APIs, infrastructure APIs) that ship REST endpoints and need polyglot SDKs without staffing language-specific maintainers — particularly companies serving developers in TypeScript, Python, and Go simultaneously.

How Speakeasy differentiates

OpenAPI Generator and Swagger Codegen are open-source SDK generators but produce output that needs heavy hand-fixing before shipping. Stainless API (also a16z-backed) competes directly. Speakeasy's differentiation is the quality of generated code — idiomatic per language, passing language-specific linting, with automatic regeneration when specs evolve. For API companies serving developers in 3+ languages, Speakeasy collapses 10-15 engineering hires into a single tool with a CI pipeline.

FAQ

Q: What is Speakeasy? A: Speakeasy is an AI-powered API SDK generator that turns OpenAPI specifications into production-grade SDKs across 10 languages — TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, Terraform, and more.

Q: Who founded Speakeasy? A: Sagar Batchu and Simon Marlow, both formerly engineers at Apollo GraphQL, co-founded Speakeasy in 2022.

Q: How much has Speakeasy raised? A: Approximately $20M+ Series A led by Andreessen Horowitz with FirstMark Capital participating.

Q: Speakeasy vs Stainless API vs OpenAPI Generator? A: OpenAPI Generator is open-source and produces output requiring hand-fixing. Stainless API is a direct commercial competitor also a16z-backed. Speakeasy's differentiation is idiomatic per-language code quality, automatic regeneration on spec changes, and a broader language matrix.

Q: Who uses Speakeasy? A: Vercel, Mistral, Codat, Snyk, Vapi, and many API-first companies use Speakeasy to ship polyglot SDKs without staffing language-specific maintainers.

tl;dr

Speakeasy is the AI-powered API SDK generator — turns OpenAPI specs into production-grade SDKs in 10 languages. $20M+ Series A led by a16z. Founded by ex-Apollo GraphQL engineers. Customers include Vercel, Mistral, Codat, Snyk, Vapi. Replaces 10-15 language-specific SDK maintainers with one CI pipeline.

Related

Looking for more options? Browse the Developer Tools directory or read our best AI coding tools listicle. Speakeasy is also tracked on Crunchbase.