# Snorkel AI

> Snorkel AI is a Redwood City-based enterprise AI company spun out of the Stanford AI Lab in 2019. Its Data Development Platform lets enterprises programmatically label, curate, and evaluate the training and evaluation data that powers custom LLMs, RAG systems, and AI agents - turning expensive manual annotation into a software-engineering discipline.

- **Founded:** 2019
- **Headquarters:** Redwood City, California, United States
- **Founders:** Alexander Ratner (Co-founder & CEO), Christopher Ré (Co-founder (Stanford advisor)), Braden Hancock (Co-founder & Head of Technology), Henry Ehrenberg (Co-founder), Paroma Varma (Co-founder)
- **Team size:** approximately 200-300 employees (some aggregators list higher)
- **Products:** Snorkel Flow, Snorkel Evaluate, Snorkel Expert Data-as-a-Service, Snorkel (open source)
- **Notable:** Spun out of the Stanford AI Lab after 5+ years of research on weak supervision., Hit unicorn status with the May 2025 Series D at a $1.3B valuation., Powering AI training data for 7 of the top 10 US banks.

## Products & services

- **Snorkel Flow** — The flagship AI data development platform for programmatic labeling, curation, and fine-tuning data preparation.
- **Snorkel Evaluate** — Generally available in 2025. A toolkit for building custom benchmarks and evaluations of LLMs, RAG, and agents on domain-specific tasks.
- **Snorkel Expert Data-as-a-Service** — A white-glove offering that pairs Snorkel's programmatic platform with a vetted network of subject-matter experts.
- **Snorkel (open source)** — The original open-source weak supervision library that started it all at Stanford.

## Achievements

- Spun out of the Stanford AI Lab after 5+ years of research on weak supervision.
- Hit unicorn status with the May 2025 Series D at a $1.3B valuation.
- Powering AI training data for 7 of the top 10 US banks.
- Deployed across multiple US federal agencies including the US Air Force.
- Original Snorkel open-source project remains widely cited in ML literature.

## Latest updates

- **2025-05** — Closed $100M Series D led by Addition at a $1.3B valuation; total raised reaches $237M.
- **2025-05** — Announced general availability of Snorkel Evaluate and Snorkel Expert Data-as-a-Service.
- **2025** — Accenture made a strategic investment and announced a financial services co-build.

## Links

- Website: https://snorkel.ai
- LinkedIn: https://www.linkedin.com/company/snorkel-ai
- Twitter/X: https://twitter.com/SnorkelAI
- GitHub: https://github.com/snorkel-team
- YouTube: https://www.youtube.com/@snorkelai
- Facebook: https://facebook.com/snorkelai

---

Profile page: https://yespress.io/snorkel-ai
Published by YesPress — https://yespress.io
Last updated: 2026-05-18