Snorkel AI

Snorkel AI is a data development platform founded in 2019 in Redwood City, California by Alex Ratner and fellow researchers spun out of the Stanford AI Lab. Its programmatic labeling technology enables enterprises to build and curate high-quality training datasets for LLMs and specialized AI models.

Snorkel serves Fortune 500 enterprises and government agencies, including financial services, healthcare, and defense customers. Its Snorkel Flow platform combines programmatic labeling with expert human feedback to accelerate model development.

Snorkel has raised approximately $235 million, including a Series D led by Addition and Greylock, with participation from Lightspeed, Walden, GV, and In-Q-Tel. The company was most recently valued at approximately $1 billion.