Observability Tools
5 curated observability tools for AI coding — compare what each one does, how it's priced, and where it fits in an AI-assisted development stack.
AgentOps
Observability for AI agents — session replay, cost and latency tracking, and debugging for multi-step runs.
freemiumobservability
Arize Phoenix
A source-available (Elastic License 2.0) LLM observability and evaluation tool built on OpenTelemetry, runnable anywhere.
freeobservability
Helicone
Open-source LLM observability and AI gateway with one-line integration — logging, tracing, caching, and cost/latency tracking across providers.
open sourceobservability
Langfuse
An open-source LLM engineering platform for tracing, evals, prompt management, and metrics.
open sourceobservability
LangSmith
LangChain's platform for tracing, evaluating, and monitoring LLM apps — framework-agnostic.
freemiumobservability