Respan records 91,503 monthly visits with -14.5% month-over-month growth and Freemium pricing. Sendmux records 37 monthly visits with -98.3% growth and Free pricing.
Open-source AI gateway with observability and evals built in
Give every AI agent a real inbox and one API to use it
| Dimension / Metric | | |
|---|---|---|
| Official Domain | respan.ai | sendmux.ai |
| Pricing Model | Freemium | Free |
| Monthly Visits | 91.5K (91,503) | 37 (37) |
| MoM Traffic Delta | -15.53K (-14.5%) | -2.2K (-98.3%) |
| Primary Market & Share | 🇺🇸 United States (28.8%) | 🇺🇸 United States (100%) |
| Direct Visits / mo | 23.12K | 12 |
| User Rating | 4.5 | 4.2 |
| Supported Platforms | Website | Website |
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.
Give every AI agent a real inbox and one API to use it
Provision mailboxes on verified domains or a shared myagent.mx address, with clean JSON output that strips signatures and quotes.
Send over HTTP or SMTP using the same mailbox credential as a Bearer token and SMTP password, with Idempotency-Key retries and attachment support.
Bind keys to providers, delivery groups, weights, and quota windows so traffic stays inside the boundaries you set.
Signed webhooks for delivery and receipt events, an SSE stream for live mailbox clients, and typed change polling for resync.
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
Collaborative inbox and email management for teams
Collaborative inbox and email management for teams
Free / Open-sourceOne open-source AI gateway for 100+ LLM providers
Email an AI assistant and let it run your schedules, inbox and CRM
The universal context engine connecting agents to data, tools, and models
Managed auth and 10,000+ tools for the agents you're building
Fast Apply and agent-tuned inference for coding agents
Fast Apply and agent-tuned inference for coding agents
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
Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
