Sentry

OpenTelemetry-native, open-source tracing and evaluation for LLM and agent applications

Open-source LLM and agent observability — traces, evals, prompt management, and cost tracking

Eval-first platform — datasets, scorers, CI gating, and logging for agent changes

Tracing, evals, and prompt management with the deepest LangChain and LangGraph integration

Tracing, evaluation, and monitoring for LLM apps inside Weights and Biases

One-line proxy for LLM logging, caching, rate limits, and cost analytics