W
Weights & Biases
44
Stack Score
Editorial pick✓ Verified working
Weights & Biases
ML experiment tracking + model management.
Try Weights & Biases✓ Free trial available
Best for
Best for ML and AI engineering teams running experiments + observing LLM apps.
At a glance
- Pricing
- freemium
- Setup time
- 30 minutes
- Learning curve
- moderate
- Last verified
- 5/26/2026
What we love
- ✓ML industry standard
- ✓Strong free tier for individuals
- ✓Weave adds LLM observability
Where it falls short
- −Pricing climbs at team scale
- −Best with ML engineering team
- −Some advanced features in higher tier
Pricing
✓ Pricing verified Jun 21, 20263 tiers
Personal
$0
forever
- ✓Unlimited personal projects
Team
$50
per user/month
- ✓Org features
Enterprise
Custom
annual
- ✓SSO
- ✓Self-host
Overview
Weights & Biases is the standard tool for ML experiment tracking, model registry, hyperparameter sweeps, and LLM-app observability (W&B Weave).
Key features
- ●Experiment tracking
- ●Hyperparameter sweeps
- ●Model registry
- ●W&B Weave for LLM tracing
- ●Reports + dashboards
Best use cases
ML experiment tracking
Track + compare ML experiments across the team.
LLM app observability
Use W&B Weave to trace + evaluate LLM app behavior.
Integrations
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