AI agents are shipping faster than we can monitor them. AgentMon helps builders find, compare, and choose the right monitoring, observability, and guardrail tools for their stack — backed by real community signals from HN, Reddit, and production engineers.
The signal badge gets the strongest visual emphasis; this page is a directory, not a decorative SaaS splash.
| Tool | Category | HN Points | Pricing Start |
|---|---|---|---|
| Forge | Agent Observability | 687 pts ↑ | Free / Open Source |
| Lightbox | Agent Debugging / Replay | — high buzz | Free / Open Source |
| Langfuse | LLM Observability | 100+ | Free → $59/mo |
| Helicone | LLM Proxy / Monitoring | — | Free → $99/mo |
| Braintrust | AI Evaluation | — | Free → $249/mo |
| AgentOps | Agent Monitoring | — | Free → $79/mo |