Resource / Observability

Helicone

An LLM API observability and cost analysis tool with proxy-based integration.

Free and open source

The core project is open source; the cloud free tier and quotas are subject to the official plan page.

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Strong Candidate · Maintenance risk 4/5

Last verified: 2026-08-28. A free tier is not a permanent commitment; re-check the official conditions before use.