Observable, Inc.

Observable builds a modern data visualization platform that helps teams explore data, create interactive charts, and collaborate across functions. Founded in 2016 by Mike Bostock, creator of D3.js, the company maintains popular open-source tools including D3 (500M+ downloads) and Observable Plot. Observable has raised funding from Sequoia and Menlo Ventures, and serves customers including The New York Times, Washington Post, MIT, and Hugging Face.