One API key for hundreds of AI models from every major provider
Composio records 2,782,603 monthly visits with +22.8% month-over-month growth and Freemium, Contact for Pricing pricing. Respan records 91,503 monthly visits with -14.5% growth and Freemium pricing.

Open-source AI gateway with observability and evals built in
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | composio.dev | respan.ai |
| Pricing Model | Freemium, Contact for Pricing | Freemium |
| Monthly Visits | 2.78M (2,782,603) | 91.5K (91,503) |
| MoM Traffic Delta | +517.42K (+22.8%) | -15.53K (-14.5%) |
| Primary Market & Share | 🇺🇸 United States (28.6%) | 🇺🇸 United States (28.8%) |
| Direct Visits / mo | 1.24M | 23.12K |
| User Rating | 4.5 | 4.5 |
| Supported Platforms | Website | Website |

Give your AI agents secure, authenticated access to 1,700+ apps
A large catalog of pre-built integrations spanning productivity, CRM, support, engineering, finance, HR, and e-commerce apps, each exposing callable actions to your agent.
Composio runs OAuth flows, stores and refreshes credentials, and enforces per-action permission scopes so agents act only where you allow them.
One managed MCP endpoint that connects Claude, ChatGPT, Codex, Cursor, and other MCP clients to your entire tool catalog in a few clicks.
Start background agents from events occurring across connected apps, so work can begin without a user prompt.

Open-source AI gateway with observability and evals built in
Route to OpenAI, Anthropic, Google, xAI, DeepSeek, Qwen and many other models through a single API key and one OpenAI-compatible endpoint.
Keep your existing OpenAI, Anthropic, LangChain or Vercel AI SDK code and change only the base URL.
Automatic fallbacks, retries and load balancing across providers and API keys keep requests answering when a single provider rate-limits or fails.
Every call is logged and traceable, with evaluation tooling and a CLI so you can query logs and traces from your terminal.
One API key for hundreds of AI models from every major provider
One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control
One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control

Free / Open-sourceOne open-source AI gateway for 100+ LLM providers

Free / Open-sourceOpen-source MCP gateway and pay-per-call catalog, but offers less extensive managed authentication workflows than Composio.

SpecialistRobust TypeScript framework for agent workflows and tools, but requires writing custom integration code instead of pre-built connectors.

Powerful universal API infrastructure for connecting agents to B2B data, but focuses more on unified SaaS data than tool execution.

Excellent managed authentication and event triggers for agent workflows, but less specialized around native MCP gateway protocols.
AI gateway, observability and guardrails for production LLM apps
Free / Open-sourceOne OpenAI-compatible API to route, monitor and control 250+ LLM models
Free / Open-sourceOne OpenAI-compatible API to route, monitor and control 250+ LLM models

SpecialistFlexible Python agent framework with built-in tools, but less focused on acting as a standalone universal integration middleware.

Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
Free / Open-sourceEvaluate, monitor, and govern your AI applications in production