Wing by Sparo Labs is a crowdfunded smartphone attachment that detects early signs of asthma attacks.
Its sensor works with a companion app to measure FEV1 (how much air one can exhale in one second) and Peak Flow (how fast one can exhale).
The company claims that data it collects over time by can allow users to visualize lung function and detect environmental and medication triggers. In addition to asthma, they believe it could be used to monitor and manage chronic obstructive pulmonary disease, cystic fibrosis, chronic bronchitis, emphysema, and pulmonary fibrosis.