Holistic AI vs Weights & Biases Weave

Holistic AI is an enterprise AI governance platform founded in 2020 and spun out of University College London by Dr. Adriano Koshiyama and Dr. Emre Kazim. Headquartered in London with a US presence, Holistic AI provides model discovery, risk assessment, bias and robustness testing, and continuous monitoring across an organization's AI portfolio — including agents, LLMs, and classic ML. The company has built a strong research footprint in algorithmic auditing.

Weights & Biases (W&B) is a San Francisco-based MLOps and LLMOps platform founded in 2017. Weave is W&B's product layer purpose-built for LLM observability, evaluation, and governance. It provides automatic tracing of LLM calls (inputs, outputs, latency, cost), evaluation pipelines with human and automated scoring, dataset versioning, and guardrails to block prompt attacks and harmful outputs. Weave integrates with major LLM providers including OpenAI, Anthropic, Google Gemini, and frameworks such as LangChain and LlamaIndex. For AI compliance, W&B runs EU AI Act-focused webinar series demonstrating how Weave can generate compliance dossiers for high-risk AI systems, providing audit trails and evidence generation. The platform holds SOC 2 Type II certification. Enterprise tier includes SSO, RBAC, and private cloud deployment. W&B has raised $305M total and was valued at $1.25B in 2023.