Open-Source Alternatives to Weights & Biases

LLM engineering platform — tracing, prompt management, cost tracking.

MIT-licensed alternative to LangSmith. Full observability for LLM chains, version-controlled prompts, A/B testing, and dataset evaluation.

LLM observability and AI gateway — one-line integration for logging, cost tracking, prompt management, and rate limiting

Build reliable AI apps with comprehensive observability

Agent observability and evaluation platform — signal alerts, trace debugging, and automated evals for LLM products

AI-powered platform for engineering LLM products

MLOps platform with W&B-compatible API — experiment tracking, model registry, and collaboration for ML teams

Track and optimize machine learning experiments with precision