Stainless review
A configurable generator for teams shipping SDKs and developer tools from OpenAPI.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Stainless is a cloud-based code-generation platform for API companies and developer-focused teams. It turns OpenAPI specifications and Stainless configuration into idiomatic SDKs, API documentation, command-line tools, MCP servers, and Terraform providers. Teams can configure resources, methods, models, client settings, pagination, webhooks, streaming, custom code, and testing across supported languages including TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, C#, and SQL.
The Free plan costs $0 and includes up to 5 generators, 5 seats, API size up to 25 endpoints, 100 preview builds per month, and email support. Starter, Pro, and Enterprise plans are also available, with paid billing offered monthly or annually. Stainless includes a 30-day free trial, and its AI features add to the platform’s developer-tooling scope. The main pricing consideration is that paid plan amounts are not stated, so teams comparing budgets will need plan-specific commercial information before selecting a tier.
Its strongest fit is an organization that treats SDKs and developer tools as part of its API product. Stainless can generate SDK tests and language-specific references, publish SDKs, automate regeneration when APIs change, scan dependencies, and update generated SDK dependencies for vulnerabilities. Hosted documentation and the web-based Stainless Studio workflow extend the platform beyond schema-to-code generation. Teams requiring on-premise code generation should choose an alternative, while teams seeking managed SDK production, documentation, CLI tooling, MCP servers, and Terraform providers can start with the Free plan and assess whether a paid tier fits.
Stainless pros and cons
- Where it wins
- Generates SDKs, tests, docs, CLIs, MCP servers, and Terraform providers
- Supports TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, C#, and SQL
- Automates publishing and regeneration as APIs change
- Where it doesn't
- Paid plan pricing is not publicly stated
- Code generation cannot be hosted on-premise
- The Free plan limits generators, seats, endpoints, and preview builds
Stainless fact sheet, pricing and score →
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