StreetCheck is an innovative community-partnered project to develop and standardize sample collection, analysis, and reporting for community drug checking programs. As the street drug supply is unregulated and unpredictable, community drug checking helps people who use drugs better understand what substances are in the drugs they use. The vision of StreetCheck streamlines community illicit drug sample collection through a free, web-based platform and app service, speeds up analysis of the samples, and makes it easier to communicate results back. The project began in Massachusetts, connects sites in the Northeast, and welcomes community partners throughout the country.