Wandb

Weights & Biases is an AI developer platform for tracking machine learning experiments and for building and monitoring LLM applications and agents. Its Weave product adds tracing to generative AI code: a developer initializes the library and decorates functions so that LLM calls, document retrieval and agent steps are captured automatically. Weave also provides evaluations against curated or adversarial datasets, plus guardrail scorers for safety, policy and quality that can run during review and in production. The core platform covers experiment tracking, a model registry with lineage, and integrations with PyTorch, TensorFlow, Keras, scikit learn, XGBoost, Hugging Face Transformers, Lightning, LangChain and LlamaIndex. A mobile app for iOS monitors training runs. It is used by ML engineers and AI teams, from individual researchers to large enterprises, and the site stresses compliance, listing ISO 27001, SOC 2 and HIPAA alignment along with governance workflows for agents. Weights & Biases was founded in 2017 and was acquired by CoreWeave in May 2025. On pricing, the site states that cloud hosted pricing has moved to CoreWeave Forge. For privately hosted deployments, a Personal plan is $0 per month with one user seat, experiment tracking and registry features, run locally with Docker and Python, and corporate use is not allowed. An Advanced Enterprise plan is custom priced, adds options such as single sign on, audit logs, custom roles and customer managed encryption keys, and comes with a free enterprise trial license.