FlowIO is a modular pneumatics development platform that makes prototyping in soft robotics and programmable materials incredibly easy! FlowIO is to soft robotics what Arduino is to electronics, enabling researchers, artists, and makers to unleash their creativity! Five pneumatic ports and multiple fully-integrated modules - for different pressure, flow, and size needs - make FlowIO suitable for wearable and non-wearable applications. FlowIO includes a software stack with APIs, Bluetooth capabilities, and a web-GUI supported on all major mobile and desktop operating systems.