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Weights & Biases

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AI developer platform for experiment tracking, evaluation, and collaboration

AI Development Platform MLOps Software
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  • Deployment Cloud Based, On Premises, Hybrid
  • Starting price Free
  • Free trial Available
  • Best for Freelancers, Startups, SMEs

What is Weights & Biases?

Weights & Biases (W&B) is an AI developer platform used to track machine learning experiments, version datasets and models, evaluate LLM applications, and monitor training runs. Adding a few lines of code to a script logs hyperparameters, metrics, GPU utilization, and sample predictions to interactive dashboards, making it easier for teams to reproduce results, debug performance, and collaborate on models.

Founded in San Francisco in 2017 and acquired by CoreWeave in May 2025, W&B offers a free plan for individuals, a Pro plan at $60 per month with a 30-day free trial for small teams, and a custom Enterprise plan with single-tenant hosting, SSO, and HIPAA compliance for larger organizations.

Key Features of Weights & Biases

Weights & Biases lists 8 documented features, including Experiment tracking with automatic logging of hyperparameters and metrics, Interactive charts for comparing training runs and Model and dataset versioning with a central registry. The list below covers what the product does rather than how it is marketed.

  • Experiment tracking with automatic logging of hyperparameters and metrics
  • Interactive charts for comparing training runs
  • Model and dataset versioning with a central registry
  • GPU, memory, and hardware utilization monitoring
  • LLM application evaluation and tracing (Weave)
  • Integrations with every major ML framework
  • Team collaboration with shared dashboards and reports
  • Service accounts and role-based access controls

Weights & Biases Pricing

Weights & Biases lists 3 plans. Two carry a published figure, from Free to $60; the rest are quoted on request.

Free

Free

5GB/month storage

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Personal development with core experiment tracking, registry access, and community support

Pro

$60/month

Up to 10 model seats, 100GB/month storage

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30-day free trial, unlimited teams, team-based access controls, priority support

Enterprise

Custom

Custom seats and storage

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Single tenant options, HIPAA compliance, SSO, audit logs, custom roles, enterprise support

Weights & Biases Specifications

Weights & Biases is available on web app. It offers an API, has a free trial and has a free plan.

Deployment
  • Cloud Based
  • On Premises
  • Hybrid
Billing cycle
Monthly
Desktop
  • Web App
Languages
  • English
Built for
  • Freelancers
  • Startups
  • SMEs
  • Enterprises
Support
  • Email
  • Live Support
  • Tickets
  • Training
Integrations
PyTorch, TensorFlow, Hugging Face, Keras, scikit-learn, LangChain, Kubernetes
Public API
Yes
Free trial
Yes
Free plan
Yes
Runs in browser
Yes
Customisable
Yes
Website
wandb.ai

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Weights & Biases FAQs

Yes, there is a free plan for personal use with 5GB of monthly storage and core experiment tracking features.

The Pro plan starts at $60 per month and includes a 30-day free trial, up to 10 model seats, and 100GB of monthly storage.

Yes, self-hosted options are available, including a free Personal edition and a custom Advanced Enterprise edition with a free trial license.

Weights & Biases was acquired by CoreWeave in May 2025 but continues to operate its platform under its own brand.

Yes, through its Weave tooling, W&B supports tracing, evaluation, and monitoring of LLM-based applications alongside traditional ML experiment tracking.