AI visibility report
Stainless ranks #9 in Documentation & Developer Portals AI search.
Outside the top three on 22 of the 25 prompts buyers actually ask.
Mintlify is cited on 17 of those losses.
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Track Stainless across these prompts daily.
Start free trial#9 among 11 vendors · still absent from 97.3% of tracked prompt responses
Top-3 citations across 150 prompt × platform pairs
Peer Ranking
Key Metrics
Platform Breakdown
Grok
Gemini Search
ChatGPT
Google AI Mode
Perplexity
Bing CopilotNarrower footprint, stronger tone. Stainless ranks #9 on presence but #2 on sentiment. That means the brand is framed well when it appears, but still needs broader prompt-response coverage.
Where Stainless is losing
Prompts where competitors are visible and Stainless is not.
These prompt-level losses are the first prompts to track and repair.
Where Stainless is winning
No clear strengths identified yet.
Where Stainless is losing5
Looking for a documentation platform that supports embedded API playgrounds, diagrams, and interactive tutorial flows — what are my options beyond basic markdown?
Competitors on 4 platforms
Track this promptWhich documentation platforms support a docs-as-code workflow where engineers write in markdown, review in pull requests, and auto-publish on merge?
Competitors on 4 platforms
Track this promptWhich developer documentation portals support content gating — showing different docs to authenticated customers vs. anonymous visitors?
Competitors on 4 platforms
Track this promptWhich documentation platforms have the best native integration with OpenAPI, AsyncAPI, and GraphQL schemas for auto-generating reference docs?
Competitors on 4 platforms
Track this promptWhich documentation platforms offer the best analytics — page visits, drop-off points, and search queries from developer users?
Competitors on 4 platforms
Track this prompt
Track Stainless daily before the next report refresh.
Track these gapsResearch dossierCapabilities, use cases, sources, reviews, pricing, and FAQ
Overview
Stainless is a New York-based developer platform founded in 2022 that generates production-quality SDKs, API documentation, and MCP servers from OpenAPI specifications. Built by the engineer who led API docs and SDK tooling at Stripe, Stainless aims to make 'Stripe-quality' developer experience accessible to any API company. Its generator produces idiomatic, fully maintained client libraries in TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform, and handles auto-pagination, retries, streaming, and versioning automatically. In 2025 the company expanded into a code-first Docs Platform built on Astro, and MCP server generation for AI agent integrations. Customers include OpenAI, Anthropic, Cloudflare, Mux, Modern Treasury, and Replicate. Stainless raised a $25M Series A led by a16z in December 2024.
Stainless is an API developer experience platform offering three core products derived from an OpenAPI spec: (1) an SDK Generator that produces idiomatic, production-maintained client libraries in up to nine languages; (2) a Docs Platform providing a code-first, AI-agent-ready documentation site built on Astro with SDK-aware API reference and built-in AI chat; and (3) an MCP Server generator that exposes REST APIs as tools for AI coding agents. All three products stay in sync as the OpenAPI spec evolves, eliminating manual maintenance overhead for API platform teams.
Key Facts
- Founded
- 2022
- HQ
- New York, USA
- Founders
- Alex Rattray, Mark McGranaghan
- Employees
- 20-50
- Funding
- $25M+
- Status
- Private
Target users
Key Capabilities10
- OpenAPI-to-SDK generation across TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform
- MCP (Model Context Protocol) server generation from OpenAPI specs for AI agent integrations
- Code-first Docs Platform (built on Astro) with SDK-aware API reference, AI chat, and docs-as-code workflows
- Stainless Transforms for preprocessing imperfect OpenAPI specs without modifying upstream source
- Preview builds in CI that show exact SDK diffs before merging OpenAPI changes
- Automated SDK versioning, changelog generation, and GitHub Release PR management
- CLI generator producing production-ready native binaries from OpenAPI specs
- Experimental SQL SDK generator that exposes REST APIs as PostgreSQL functions
- Language Server (LSP) for real-time spec diagnostics and completions in local IDEs
- Built-in support for auto-pagination, retries, streaming (SSE, WebSocket), and OAuth 2.0
Key Use Cases7
- API-first companies shipping and maintaining idiomatic multi-language SDKs without dedicated SDK engineers
- AI model providers (LLM APIs) offering typed, auto-updating client libraries to millions of developers
- Developer infrastructure platforms automating SDK updates in sync with rapidly evolving OpenAPI specs
- Teams publishing API documentation that stays automatically in sync with their OpenAPI spec and generated SDKs
- Companies generating MCP servers to expose their APIs to AI coding agents and agentic workflows
- Fintech and regulated-industry API providers needing consistent, auditable SDK releases across languages
- Platform teams reducing integration support burden by providing high-quality typed client libraries
Stainless customer outcomes
1,000+ endpoints across 3 language SDKs with automated updates
Cloudflare transitioned from inconsistent, manually maintained SDKs to automatically shipping over 1,000 API endpoints across three language SDKs with hands-off updates, enabling a single pull-request workflow for the majority of API changes.
Live API docs in 2 days
Beeper was able to launch production API documentation for their new API using the Stainless Docs Platform in just two days, far faster than anticipated.
Recent Trend
How AI describes Stainless3
Stainless (early access): Self-hosted docs generation where sites are files you control; can be deployed on your infra with adapters for SSR, various edge/CDN setups.
What are the best self-hosted documentation platforms for teams that want minimal infrastructure overhead and zero-downtime deployments?
...tically generating accurate, idiomatic SDK code samples from an OpenAPI spec tend to be APIMatic, Mintlify (with Speakeasy/Stainless integrations), ReadMe, and OpenAPI Generator (for code and docs), with Mintlify and APIMatic offering particularly strong...
Which documentation platforms generate the most accurate and idiomatic SDK code samples automatically from an OpenAPI spec?
Stainless ------------- If your primary metric for "idiomatic" is the premium developer experience seen in libraries like OpenAI, Anthropic, or Cloudflare, Stainless is the gold standard.
Which documentation platforms generate the most accurate and idiomatic SDK code samples automatically from an OpenAPI spec?
Most cited sources5
- S4
Speakeasy vs. Stainless | Stainless
stainless.com·Documentation
- A4
Mintlify | Stainless SDKs
app.stainless.com·Documentation
- S3
Integrate with third-party docs frameworks and systems | Stainless
stainless.com·Documentation
- S1
Fern vs. Stainless | Stainless
stainless.com·Documentation
- S1
Bump.sh
stainless.com·Documentation
Alternatives in Documentation & Developer Portals6
Stainless occupies a premium niche as an all-in-one API developer experience platform that generates idiomatic SDKs, a code-first docs site, and MCP servers from a single OpenAPI spec.
- Its core differentiator is the pursuit of 'Stripe-quality' API tooling—rooted in the founder's background building API tooling at Stripe—targeting API-first companies that want to offer handcrafted-feeling, multi-language client libraries and documentation without hiring dedicated SDK engineering teams.
- Stainless competes primarily on code quality, enterprise pedigree (OpenAI, Anthropic, Cloudflare as reference customers), and its emerging AI-agent experience (AX) positioning, which is less emphasized by documentation-only competitors.
- Unlike Fern (its closest analog), Stainless was public about shipping the official SDKs for OpenAI and Anthropic before offering self-serve access, lending a strong trust signal to enterprise buyers.
Reviews
Praised
- High-quality, idiomatic SDK code generation
- Eliminates manual SDK maintenance overhead
- Strong multi-language coverage (9+ languages)
- Seamless GitHub-based CI/CD workflow
- Handles complex, large OpenAPI schemas other tools cannot
- Fast time-to-production for docs and SDKs
- Pedigreed by powering OpenAI and Anthropic SDKs
- Active product development cadence
Criticized
- No on-premise or self-hosted code generation option
- Requires GitHub account for all users
- API endpoint limits on lower-tier plans
- Docs Platform relatively new (public beta 2026)
- Pricing per-generator can add up for multi-language API teams
- SOC 2 report only available on higher-tier plans
No independent third-party review data (G2, Gartner Peer Insights, Capterra) was publicly available for Stainless as of April 2026. Published customer testimonials highlight speed of setup, quality of generated code, and elimination of manual SDK maintenance overhead. Cloudflare noted moving from inconsistent manual SDKs to shipping 1,000+ endpoints across three language SDKs with automated updates within months. Beeper reported going live with API docs in 2 days using the Docs Platform. Sentiment in developer communities and press coverage is broadly positive, with coverage in TechCrunch and Analytics India Mag.
Pricing
Stainless charges per 'generator' (each SDK, Docs site, or MCP server counts as one generator). Free tier: $0, up to 5 generators, ≤25 API endpoints, basic features.
- Starter
$79/month per generator (monthly billing; annual discounts available), up to 50 endpoints included, onboarding Slack support.
- Pro
$499/month per generator, up to 100 endpoints, dedicated Slack channel, mock test server, OAuth 2.0, up to 10,000 lines of custom code.
- Enterprise
custom pricing with SSO, audit logs, breaking change detection, advanced release management, SLAs, and white-glove onboarding. Volume discounts available on paid plans. Generated SDK code is licensed Apache 2.0 and owned by the customer. Non-commercial open-source projects may qualify for a free Starter plan.
Limitations
- Stainless code generation cannot be deployed on-premise; the generation engine runs exclusively on Stainless infrastructure.
- A GitHub account is required for authentication and SDK delivery.
- Free and Starter tiers cap included API endpoints (≤25 and 50 respectively), with overage billed per endpoint.
- Custom code additions are capped at 1,000 lines on Starter and 10,000 lines on Pro.
- The Docs Platform entered public beta only in March 2026 and lacks some mature features found in established documentation platforms.
- SOC 2 compliance report is only available on Business/Enterprise plans upon request.
- No on-premise or air-gapped deployment option exists.
Frequently asked questions
Topic coverageCoverage by buyer topic
Topic Coverage
Prompt-Level Results
| Prompt | Google AI Mode | Gemini Search | ChatGPT | Perplexity | Bing Copilot | Grok |
|---|---|---|---|---|---|---|
Capability1/5 cited (20%) | ||||||
Which documentation platforms handle changelog management best — auto-generating changelogs from commit messages or API spec diffs? | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which developer portal platforms offer semantic search rather than just keyword matching across docs? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms generate the most accurate and idiomatic SDK code samples automatically from an OpenAPI spec? | A competitor was cited | Your brand and a competitor were cited | Your brand was cited | Neither your brand nor a competitor was cited | A competitor was cited | Your brand and a competitor were cited |
Looking for a documentation platform that supports embedded API playgrounds, diagrams, and interactive tutorial flows — what are my options beyond basic markdown? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which developer documentation portals support content gating — showing different docs to authenticated customers vs. anonymous visitors? | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited |
Developer Experience0/5 cited (0%) | ||||||
Which documentation platforms offer the best collaboration features so non-technical writers and engineers can work together without friction? | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
What tools help teams keep auto-generated API reference docs in sync with the actual API as it evolves? | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms handle versioned docs for multiple active major versions without duplicating content across v2 and v3? | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which developer documentation platforms do engineers actually keep up to date — what makes the writing experience good enough that docs don't become stale? | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which developer portal platforms offer the best code sample experience — multi-language snippets, inline API explorers, and runnable examples? | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Integrations & Ecosystem0/5 cited (0%) | ||||||
Which documentation platforms can pull content from multiple repositories in a monorepo or multi-repo setup and stitch it into a single unified portal? | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which developer documentation tools integrate into CI/CD pipelines for automatic validation and publishing when an API changes? | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited |
Which documentation platforms have the best native integration with OpenAPI, AsyncAPI, and GraphQL schemas for auto-generating reference docs? | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms handle localisation and machine translation workflows well while still supporting a human review process? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms offer the best analytics — page visits, drop-off points, and search queries from developer users? | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Performance & Reliability0/5 cited (0%) | ||||||
What are the best self-hosted documentation platforms for teams that want minimal infrastructure overhead and zero-downtime deployments? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms score best on Core Web Vitals — is SEO performance a real differentiator when choosing a docs tool? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which hosted documentation platforms perform best for a global developer audience — CDN coverage and page load times for international users? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which documentation platforms handle very large sites well — thousands of pages without degraded build times or slow navigation? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which SaaS documentation platforms offer the strongest SLAs and have the best track record for uptime on customer-facing developer docs? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Setup & First Run1/5 cited (20%) | ||||||
What documentation platforms handle multi-audience portals well — separate content access and versioning for different customer tiers? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
I'm migrating a large docs site from a static site generator to a managed platform — which documentation tools handle URL migration and redirects well? | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
What's the fastest documentation platform to get a professional API docs site live from an existing OpenAPI spec? | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Which documentation platforms support a docs-as-code workflow where engineers write in markdown, review in pull requests, and auto-publish on merge? | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited |
Which developer documentation platforms make it easiest to white-label with a custom domain and brand styles for a B2B SaaS product? | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Turn this matrix into daily prompt monitoring.
Track prompt changesVertical Ranking
| # | Brand | PresencePres. | Share of VoiceSoV | DocsDocs | BlogBlog | MentionsMent. | Avg PosPos | Sentiment |
|---|---|---|---|---|---|---|---|---|
| 1 | Mintlify | 36.7% | 27.6% | 2.0% | 10.7% | 59.3% | #24.7 | +0.38 |
| 2 | GitBook | 28.0% | 29.1% | 12.7% | 24.0% | 56.7% | #40.8 | +0.29 |
| 3 | Fern | 19.3% | 10.6% | 2.0% | 4.0% | 18.7% | #18.6 | +0.37 |
| 4 | Docusaurus | 11.3% | 9.9% | 8.0% | 2.0% | 0.0% | #43.6 | +0.29 |
| 5 | Bump.sh | 6.7% | 6.3% | 1.3% | 6.7% | 10.7% | #32.8 | +0.27 |
| 6 | ReadMe | 6.7% | 6.5% | 5.3% | 3.3% | 57.3% | #50.9 | +0.16 |
| 7 | Redocly | 4.0% | 4.1% | 2.0% | 2.0% | 30.0% | #43.4 | +0.32 |
| 8 | Archbee | 3.3% | 2.8% | 2.0% | 2.7% | 6.7% | #67.1 | +0.35 |
| 9 | Stainless | 2.7% | 1.7% | 2.7% | 0.0% | 5.3% | #19.0 | +0.50 |
| 10 | Scalar | 2.0% | 1.5% | 0.7% | 0.0% | 12.7% | #56.1 | +0.57 |
| 11 | Swimm | 0.0% | 0.0% | 0.0% | 0.0% | 1.3% | — | — |
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