Library / SDK
Observability & Evaluation
Helicone
1Observability 2and 3logging 4for 5LLM 6apps.
the six Ws · specification
W1
Who
Open-source project from Helicone.
W2
What
Logs requests, costs, and latency for LLM calls.
W3
Where
Self-hosted or Helicone Cloud, via a proxy.
W4
When
When you need cost and usage visibility.
W5
Why
One-line integration to monitor LLM traffic.
W6
With
A proxy header change in your app.