Weights & Biases
What is Weights & Biases?
Tools for training, tracking and evaluating AI models.
Weights & Biases provides tools for machine learning teams to track experiments, version datasets and models, and evaluate AI applications. Its Weave product helps developers trace and evaluate applications built on language models.
It is used by AI research labs and companies training and deploying models. Weights & Biases was acquired by CoreWeave in 2025. A free tier is available for individuals. Teams use it to compare training runs, share results and keep a record of how models were built.
Key features
- Experiment tracking
- Model and dataset versioning
- Weave for LLM app evaluation
- Dashboards and reports
- Collaboration
Best for
- Machine learning engineers
- AI research teams
- Teams evaluating LLM apps
Key facts
- Founded
- 2017
- Based in
- United States
- Category
- AI Developer Platforms
- Pricing
- Free plan + paid plans
- Available on
- Web, API
- Website
- wandb.ai
Compiled by TrustKite from public information. Last updated 24 October 2026. Own this business? Claim it to edit these details.
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What is Weights & Biases?
Weights & Biases provides tools for machine learning teams to track experiments, version datasets and models, and evaluate AI applications. Its Weave product helps developers trace and evaluate applications built on language models. Its main features include: Experiment tracking; Model and dataset versioning; Weave for LLM app evaluation; and Dashboards and reports.
Who is Weights & Biases for?
Weights & Biases is a good fit for: Machine learning engineers; AI research teams; and Teams evaluating LLM apps.
Is Weights & Biases free?
Weights & Biases has a free plan, with paid plans that add more usage or features. Prices change often, so check the official website for current plans.
Where can I use Weights & Biases?
Weights & Biases is available on Web and API.
Where is Weights & Biases based?
Weights & Biases was founded in 2017 and is based in the United States.
What do customers say about Weights & Biases?
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What are the alternatives to Weights & Biases?
Popular alternatives to Weights & Biases include OpenAI API, Claude Developer Platform, Google AI Studio and xAI API. Compare their scores and reviews below.
