Weights & Biases - StartupWiki | AI Startup Research Directory

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Weights & Biases — Startup ProfileThe AI developer platform — the de facto 'GitHub for ML', now a CoreWeave companyHQ: San Francisco, CA (CoreWeave company) | Founded: 2017 | Employees: ~300 (309 as of Mar 2026) | Stage: Acquired by CoreWeave (closed May 2025, $1.7B) | Website: https://wandb.aiAboutWeights & Biases (wandb.ai) is the AI developer platform founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis — the founders of CrowdFlower/Figure Eight — with a mission to 'build the best tools for AI developers'. The company was born behind a karate studio in San Francisco, and its first product was built while helping OpenAI scale model building. W&B's experiment tracking made a single line of code capture git commits, hyperparameters, weights, datasets, and rich media (images, video, audio), turning ML experiments into shareable reports — and became the de facto standard at top labs (OpenAI, Mistral, Cohere, Meta, Toyota Research, Canva, Samsung, Snowflake). The platform grew into a full system of record: W&B Models (experiments, sweeps, artifacts, registry), W&B Weave (LLKey Metrics

Acquisition Value (CoreWeave): $1.7B

Last Private Valuation: $1.25B (Aug 2023)

Total Funding: ~$250M

ARR (Dec 2024): ~$50M

Users: 1M+ AI engineers, 1,500+ enterprises

Founded: 2017

Funding Rounds

Round: $5M (2018-05-31) — Trinity Ventures, Bloomberg Beta

Round: $15M (2019-05-30) — Coatue

Round: $45M (2021-02-01) — Insight Partners

Round: $135M (2021-10-13) — Felicis, BOND

Round: n/d (2022-05-17) — NVIDIA

Key People

Lukas Biewald

Chris Van Pelt

Shawn Lewis

Robin Bordoli

Key Competitors

MLflow (Databricks) —

Neptune.ai —

Comet ML —

LangSmith (LangChain) —

Timeline Highlights

2026-06-30: ARIA + Weave agents GA

2026-02: W&B Training + 3 inference models

2025-06-18: W&B Inference launch

2025-05-05: Acquisition completed

2025-03-04: CoreWeave acquisition announced