# AI tools for “OpenAPI documentation” 273 matching tools; showing 24, ranked by relevance. Filters: `platform=website` | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Why it matched | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [Postman](https://openaitools.app/tool/postman) | 1,764,877 | -7.6% | Freemium | Design, test, and govern APIs — now with AI agents in the loop | keywords 100%; semantic match | [.md](https://openaitools.app/tool/postman.md) | | 2 | [OpenAI Platform](https://openaitools.app/tool/openai) | 234,678,639 | -9.6% | Paid | Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents. | semantic match | [.md](https://openaitools.app/tool/openai.md) | | 3 | [Theneo](https://openaitools.app/tool/theneo) | 31,850 | -17.3% | Freemium, Paid, Contact for Pricing | API docs that humans and AI agents ship together | keywords 100%; semantic match | [.md](https://openaitools.app/tool/theneo.md) | | 4 | [OpenRouter](https://openaitools.app/tool/openrouter-ai) | 19,941,437 | -6.2% | Paid | One API key for hundreds of AI models from every major provider | semantic match | [.md](https://openaitools.app/tool/openrouter-ai.md) | | 5 | [GitBook](https://openaitools.app/tool/the-new-gitbook) | 557,489 | -4.6% | Freemium | The documentation platform that keeps docs accurate for people and AI | semantic match | [.md](https://openaitools.app/tool/the-new-gitbook.md) | | 6 | [Eraser](https://openaitools.app/tool/eraser) | 534,396 | -23.6% | Freemium, Paid, Contact for Pricing | AI diagrams and technical design docs built from your code and systems | semantic match | [.md](https://openaitools.app/tool/eraser.md) | | 7 | [n8n](https://openaitools.app/tool/n8n) | 4,522,449 | -7.4% | Freemium | Open-source workflow automation built for AI agents and technical teams | semantic match | [.md](https://openaitools.app/tool/n8n.md) | | 8 | [Mintlify](https://openaitools.app/tool/mintlify) | 248,197 | -22.9% | Freemium, Free Trial, Paid, Contact for Pricing | The intelligent documentation platform that keeps itself up to date | semantic match | [.md](https://openaitools.app/tool/mintlify.md) | | 9 | [AGENTS.md](https://openaitools.app/tool/agents-md) | 245,457 | +5.7% | Free | An open Markdown convention for telling coding agents how your project works | semantic match | [.md](https://openaitools.app/tool/agents-md.md) | | 10 | [Kie.ai](https://openaitools.app/tool/kie-ai-affordable-secure-deepseek-r1-api) | 2,275,553 | -22.4% | Pay-as-you-go | One API key for video, image, music, and chat models | semantic match | [.md](https://openaitools.app/tool/kie-ai-affordable-secure-deepseek-r1-api.md) | | 11 | [Firecrawl](https://openaitools.app/tool/firecrawl-dev) | 1,828,239 | -1.9% | Freemium, Contact for Pricing | Web data API that turns any site into clean, AI-ready content | semantic match | [.md](https://openaitools.app/tool/firecrawl-dev.md) | | 12 | [OpenL Translate](https://openaitools.app/tool/openl) | 1,470,643 | +8.8% | Freemium, Subscription | AI translation for text, images, documents and speech in 100+ languages | semantic match | [.md](https://openaitools.app/tool/openl.md) | | 13 | [CometAPI](https://openaitools.app/tool/cometapi) | 602,966 | +49.7% | Pay-as-you-go (credits) | One OpenAI-compatible API key for 500+ AI models | semantic match | [.md](https://openaitools.app/tool/cometapi.md) | | 14 | [Together AI](https://openaitools.app/tool/together-ai) | 1,645,930 | +64.9% | Freemium, Paid | Together AI is the AI Native Cloud — a full-stack platform for running, fine-tuning and training open-source models. It spans serverless inference APIs, dedicated endpoints, GPU clusters, post-training and storage, all b | semantic match | [.md](https://openaitools.app/tool/together-ai.md) | | 15 | [Treg](https://openaitools.app/tool/treg) | 452,935 | +223.4% | Freemium | One key for 4,100+ agent tools, pay per call | semantic match | [.md](https://openaitools.app/tool/treg.md) | | 16 | [Ferndesk](https://openaitools.app/tool/ferndesk) | 37,877 | -38.5% | Free Trial, Paid, Contact for Pricing | The help center that verifies and updates itself | keywords 100% | [.md](https://openaitools.app/tool/ferndesk.md) | | 17 | [OrcaRouter](https://openaitools.app/tool/orcarouter) | 975,300 | -5.2% | Freemium | One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control | semantic match | [.md](https://openaitools.app/tool/orcarouter.md) | | 18 | [APIMart](https://openaitools.app/tool/apimart) | 383,148 | +6.3% | Freemium, Paid | One OpenAI-compatible API for 190+ text, image, video and audio models | semantic match | [.md](https://openaitools.app/tool/apimart.md) | | 19 | [Agnes AI](https://openaitools.app/tool/agnes-ai) | 902,184 | -25.8% | Freemium | One free API for text, image, and video AI models | semantic match | [.md](https://openaitools.app/tool/agnes-ai.md) | | 20 | [Atlas Cloud](https://openaitools.app/tool/atlas-cloud) | 777,031 | -16.4% | Paid | One OpenAI-compatible API for 500+ image, video, audio, and LLM models | semantic match | [.md](https://openaitools.app/tool/atlas-cloud.md) | | 21 | [Open WebUI](https://openaitools.app/tool/open-webui) | 804,534 | -2.8% | Freemium | Self-hosted AI workspace for local and cloud models | semantic match | [.md](https://openaitools.app/tool/open-webui.md) | | 22 | [LiteLLM](https://openaitools.app/tool/litellm) | 576,967 | +7.9% | Freemium, Contact for Pricing | One open-source AI gateway for 100+ LLM providers | semantic match | [.md](https://openaitools.app/tool/litellm.md) | | 23 | [ZenMux](https://openaitools.app/tool/zenmux) | 444,394 | +16.7% | Freemium, Paid | One unified API for 100+ AI models, with insurance when output disappoints | semantic match | [.md](https://openaitools.app/tool/zenmux.md) | | 24 | [LLM Gateway](https://openaitools.app/tool/llm-gateway) | 168,426 | -14.5% | Freemium, Contact for Pricing | One OpenAI-compatible API to route, monitor and control 250+ LLM models | semantic match | [.md](https://openaitools.app/tool/llm-gateway.md) | Page 1 of 12 · [Next page →](https://openaitools.app/index.md?q=OpenAPI+documentation&platform=website&page=2) For programmatic access use `https://openaitools.app/api/tools?q=…` or MCP `https://openaitools.app/api/mcp`. --- Source: https://openaitools.app/?q=OpenAPI%20documentation More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)