Comet

Comet is a developer platform for building and evaluating AI agents and machine learning models, combining LLM observability with traditional ML experiment tracking under one product line. Its Opik platform lets developers log every step an AI agent takes using more than 60 integrations, automatically groups recurring errors found across large numbers of traces, and offers an assistant called Ollie that suggests fixes for problems in tool calls, context retrieval, or prompts. Teams can also run test suites against more than 40 LLM-as-a-judge metrics and monitor agents in production with dashboards and alerts. Comet's original experiment-management tools remain part of the platform, letting data scientists track training runs, version datasets and models, and visualize results across frameworks such as PyTorch, TensorFlow, Hugging Face, and Scikit-learn. Developers typically add a few lines of code to their existing project to start logging automatically, without changing their workflow. The platform is available as a free-tier cloud service, a self-hosted open-source deployment, or an enterprise plan, and Comet says it is used by over 150,000 developers at companies including Uber, Netflix, Autodesk, and Etsy. Comet does not state its founding year or legal company name on the pages reviewed, so those remain unconfirmed.