Observability & tracing
6 observability & tracing tools, with pricing model, free tier and open-source status.
Open-source LLM tracing and evaluation, OpenTelemetry-native.
open sourceself-hostableaffiliate· Phoenix is free and self-hostable
Open-source observability proxy for LLM apps.
open sourceself-hostable· 10k requests/mo free
Open-source LLM tracing, evals and prompt management.
open sourceself-hostable· Hobby - 50k units/mo, cloud or self-host
Tracing, evals and monitoring from the LangChain team.
· Developer - 5k traces/mo free
OpenLLMetry - open-source OpenTelemetry instrumentation for LLMs.
open sourceself-hostable· Free up to 50k spans/mo
LLM app tracing and evals inside Weights & Biases.
affiliate· Free personal tier
"affiliate" = a known partner programme, being confirmed as we join. Confirm pricing on the tool's site.