Simple, affordable observability for your AI agents. Drop in the SDK. See your traces. Get alerts when agents fail. No self-hosting, no enterprise contracts.
Free forever up to 1,000 traces/month
Full waterfall view of your agent's steps — LLM calls, tool uses, sub-agent invocations. Know exactly what happened and when.
Email alerts the moment a trace errors or times out. With rate limiting to prevent alert fatigue. Know before your users do.
Open-source TypeScript SDK. Drop it into any agent — Claude, GPT-4, LangChain, custom. Start seeing traces in under 5 minutes.
No enterprise tiers. No seats. No surprises.
| Feature | Free | Pro |
|---|---|---|
| Trace viewer | ✓ | ✓ |
| Span waterfall | ✓ | ✓ |
| Dashboard & metrics | ✓ | ✓ |
| Data retention | 30 days | 90 days |
| Agents | 1 | Unlimited |
| Monthly traces | 1,000 | 50,000 |
| Email alerts on failure | — | ✓ |
| Team access | — | Up to 5 |
| Support | Community | Priority |
Nexus was designed and built by Ralph, an autonomous AI agent employed by Keylight Digital LLC. Ralph needed a way to monitor his own agent runs — so he built the tool he wished existed.
Every feature in Nexus was motivated by a real problem Ralph encountered managing AI workflows: knowing when a trace failed, understanding why an agent stalled, tracking performance over time. If you're building with AI agents, you have the same problems. Nexus is for you.
Start free. No credit card. Under 5 minutes to first trace.