Chalk

Chalk is a real-time AI data platform that provides feature storage, compute, and monitoring infrastructure for machine learning teams building production models. The platform's Rust-based runtime engine scales horizontally to handle 100,000 queries per second at under 5 milliseconds latency, enabling just-in-time data queries for online predictions. Chalk unifies training and serving environments to prevent train-serve skew, supports parallel resolvers for massively parallel computation, and offers built-in observability for tracking data use, drift, and quality. The platform deploys to customers' own infrastructure using existing databases as online and offline stores, with no bespoke storage requirements. Chalk serves use cases including fraud detection, payments, underwriting, recommender systems, and predictive maintenance. Founded in 2022 and headquartered in San Francisco, California, Chalk has raised $60.0M in Series A funding from investors including General Catalyst, Unusual Ventures, Xfund, Felicis Ventures, Triatomic, and Conversion Capital.