Weights & Biases
Best for ML engineers
Comprehensive MLOps platform
LLM observability tools
Flexible deployment
Free for personal use
Accelerate AI development with experiment tracking, model management, and LLM observability.
Last updated: May 30, 2026
FREEMIUM
wandb.ai
Quick Answer
Weights & Biases is an MLOps platform for machine learning engineers and data scientists to track, visualize, and manage AI experiments, optimize hyperparameters, and monitor LLM applications. It offers features like experiment tracking, model registry, and LLM observability tools. Best for individuals and teams developing and deploying AI models and applications. It offers a free tier for personal use and paid plans starting at $60/month.
About Weights & Biases
Weights & Biases is an MLOps platform designed for machine learning engineers and data scientists to track, visualize, and manage their AI experiments and models. It offers tools for experiment tracking, hyperparameter optimization, model registry, and LLM observability, enabling faster iteration and deployment of AI applications. Available with a free tier for personal use and paid plans for professionals and enterprises.
What Makes It Unique
Weights & Biases provides a comprehensive platform that integrates experiment tracking, hyperparameter sweeps, model and dataset versioning (Artifacts), and LLM-specific observability (Weave) including traces, evaluations, agents, and guardrails, all within a single system.