Startup
Traceloop
LLM reliability platform that turns evals and monitors into a continuous feedback loop
Traceloop is an LLM reliability platform for monitoring, evaluating and improving LLM applications. It is built on OpenTelemetry and ships with its open-source OpenLLMetry SDK. It also offers Hub, an OpenTelemetry-based gateway. The site announces that Traceloop is joining ServiceNow.
Neighbours in the directory
San Francisco, CA · Est. 2022
The de-facto standard toolkit for building LLM applications and agents.
LangChain makes the LangChain framework and LangGraph, the low-level orchestration standard for stateful, controllable agents, plus the LangSmith platform for tracing, evaluating and monitoring them in production.
~$75M raised
San Francisco, CA · Est. 2023
Enterprise-grade evals, data and AI gateway.
Braintrust turns prompts and agent traces into testable datasets and CI, plus an inference gateway — helping teams measure whether harness changes actually improve agent quality.
Berkeley, CA · Est. 2020
Observability and evaluation for AI — makers of OSS Phoenix.
Arize traces and evaluates LLM and agent systems in production; their open-source Phoenix tracer is a common instrumentation choice for agent harnesses that need to be debuggable.
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Maintains · 1
- OpenLLMetryProject
Similar entries · 1
- HoneyHiveStartup
Sources
Verified Oct 29, 2026