One API key for hundreds of AI models from every major provider
#1Respan records 91,503 monthly visits with -14.5% month-over-month growth and Freemium pricing. Superhuman records 6,514,241 monthly visits with +7.9% growth and Paid pricing.

Open-source AI gateway with observability and evals built in
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | respan.ai | superhuman.com |
| Pricing Model | Freemium | Paid |
| Monthly Visits | 91.5K (91,503) | 6.51M (6,514,241) |
| MoM Traffic Delta |
| -15.53K (-14.5%) |
| +477.48K (+7.9%) |
| Primary Market & Share | 🇺🇸 United States (28.8%) | 🇺🇸 United States (56.8%) |
|---|
| Direct Visits / mo | 23.12K | 4.96M |
|---|
| User Rating | 4.5 | 4.5 |
|---|
| 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.

The AI productivity suite with agents, email, and docs that work wherever you do
Superhuman Go brings AI agents into the tools and tabs you already use, with inline suggestions and context-aware chat.
Auto drafts, split inbox, auto labels, and auto archive keep your inbox manageable with minimal manual filing.
Collaborative documents that hold text, tables, data, and workflows in one connected surface.
Describe what you need in chat or use a visual builder, then share agents with teammates or a company directory.
One API key for hundreds of AI models from every major provider
#1One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control

Combines shared inboxes and team chat with AI assistance, but feels less optimized for solo speed.

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


Provides a smart inbox and AI writing tools across devices, but offers less advanced custom triage shortcuts.

Delivers cross-platform AI email management with strong privacy focus, but has a more traditional interface.

SpecialistAn AI executive assistant that works across your inbox, calendar and meetings

AI gateway, observability and guardrails for production LLM apps

Offers an AI-native email client with automated summaries and bundles, but lacks Superhuman's extreme speed focus.
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

One API key for 70+ AI models, 1,000+ data APIs and web tools
One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control
Combines shared inboxes and team chat with AI assistance, but feels less optimized for solo speed.
Provides a smart inbox and AI writing tools across devices, but offers less advanced custom triage shortcuts.
Delivers cross-platform AI email management with strong privacy focus, but has a more traditional interface.
SpecialistAn AI executive assistant that works across your inbox, calendar and meetings
Offers an AI-native email client with automated summaries and bundles, but lacks Superhuman's extreme speed focus.
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