One API key for hundreds of AI models from every major provider
OrcaRouter records 975,300 monthly visits with -5.2% month-over-month growth and Freemium 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 | orcarouter.ai | respan.ai |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 975.3K (975,300) | 91.5K (91,503) |
| MoM Traffic Delta | -53.81K (-5.2%) | -15.53K (-14.5%) |
| Primary Market & Share | 🇺🇸 United States (21.5%) | 🇺🇸 United States (28.8%) |
| Direct Visits / mo | 249.71K | 23.12K |
| User Rating | 4.3 | 4.5 |
| Supported Platforms | Website | Website |
One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control
Each prompt is graded and routed to the model that clears your quality bar, with configurable fallback chains that retry before a response starts.
Pay provider prices with $0 per-token added on pay-as-you-go and subscriptions, or bring your own provider keys and credits.
PII shielding, jailbreak and injection blocking, and per-call approval for tool and MCP actions run before you are billed.
Request logs, per-prompt receipts, routing and spend dashboards, and copy-as-cURL make every call auditable and attributable.

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 API key for 500+ AI models
One OpenAI-compatible API key for 500+ AI models

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

Routes requests across frontier models with automatic failover and analytics, serving as a straightforward alternative API proxy.
Routes requests across frontier models with automatic failover and analytics, serving as a straightforward alternative API proxy.
Gives developers a single OpenAI-compatible endpoint for multiple LLMs with failover, but offers fewer advanced routing rules.
AI gateway, observability and guardrails for production LLM apps

Unifies multi-provider model access with built-in governance and cost tracking, but functions more as a broad AI marketplace.
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

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

One API key for 70+ AI models, 1,000+ data APIs and web tools
Free / Open-sourceOpen-source LLM observability and AI gateway for shipping reliable AI apps
Free / Open-sourceOpen-source LLM observability and AI gateway for shipping reliable AI apps

Free / Open-sourceThe open-source LLM gateway that fixes your agents' requests on the fly
Free / Open-sourceThe open-source LLM gateway that fixes your agents' requests on the fly