Harmful algal blooms like cyanobacteria occur all around the world and endanger both human and marine health.

CyFi is a command line tool that uses satellite imagery and machine learning to detect dangerous concentrations of cyanobacteria in small, inland water bodies. Built on the winning solutions of the Tick Tick Bloom competition, the goal of CyFi is to help water quality managers better allocate resources for in situ sampling and make more informed decisions around public health warnings for critical resources like lakes and reservoirs.