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As of May 18, 2026
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Weights & Biases
ML experiment tracking and model management platform.
AI InfrastructureFounded January 2018#4 of 54 in AI Infrastructure
Updated May 29, 2026
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Company profile
What is Weights & Biases?
Weights & Biases is the standard tool for ML experiment tracking. Used by OpenAI, Anthropic, and thousands of ML teams. Raised $200M+ Series C at $1.25B valuation.
Latest company data
Primary data point
Downloads
25.6M/30d
Tracked package: PyPI wandb
▲ +2%Updated 1d ago
Other data points
Dependent projects
2.1K
Projects depending on tracked package: PyPI wandb
Updated 9h ago
GitHub stars
11.1K
Main repository stars
Updated 9h ago
Hacker News
13/30d
Position #17 in category discussion
Updated 9h ago
Repository health
Maintenance data from the main open-source repository.
Key-person riskSource: GitHub public event dataUpdates: WeeklyCaveat: Minimum developers needed for half of recent code changes. Lower = higher concentration risk.Methodology →
2
External contributorsSource: GitHub public event dataUpdates: WeeklyCaveat: Based on push events; may undercount contributors who only open PRsMethodology →
44
% of recent contributors outside the core team
Releases (30d)Source: GitHub release dataUpdates: WeeklyCaveat: Published releases in the last 30 daysMethodology →
0
Repository usage
Public repositories and source files importing packages tied to Weights & Biases.
Repos importingMetric: Public GitHub repos using company packagesSource: ecosyste.ms Packages APIScope: UTC daily snapshotUpdates: DailyFreshness: 48h target; 48h expected source lagConfidence: HighCaveat: Public GitHub dependency data only; private repos and direct API use outside those packages are not visible.Methodology →
9.3K0%
About Weights & Biases
Weights & Biases is the standard tool for ML experiment tracking. Used by OpenAI, Anthropic, and thousands of ML teams. Raised $200M+ Series C at $1.25B valuation.
FoundersLukas Biewald, Chris Van Pelt, Shawn Lewis
Funding
$250M · 5 roundsRaised $250M total. Category position #4 of 54 in AI Infrastructure.
Strategic Investment2023
$50MDaniel Gross, Nat Friedman
Series C2021
$135MFelicis, Bond
Series B2021
$45MInsight Partners
Series A2019
$15MTrinity Ventures, Coatue
Seed2018
$5MTrinity Ventures
Investors
BondCoatueDaniel GrossFelicisInsight PartnersNat FriedmanTrinity Ventures
Tracked packages (1)
1 PyPI
wandb
PyPIMain PyPI packagewandb
Track and version datasets, models, and other files used in ML workflows for reproducibility.