A team from the University of Cambridge and GlitterinTech has introduced a groundbreaking optical spectrometer that costs around $10 and is small enough for wearable applications. This new convolutional spectrometer utilizes a unique operating principle based on the convolution theorem, allowing it to achieve high precision and noise tolerance without the computational overhead typical of traditional spectrometers. Operating within the near-infrared range of 1,200–1,700 nm, it can perform rapid spectrum recovery and has demonstrated exceptional performance in real-world applications, including the classification of various materials with 100% accuracy and the quantification of chemical concentrations to 0.01%. Notably, it can also noninvasively monitor human biomarkers, such as blood glucose and alcohol levels, under realistic physiological conditions. The device's robustness, functioning effectively across a temperature range of -20°C to 80°C, enhances its potential for deployment in diverse settings, from healthcare to industrial use. Researchers believe this innovation could lead to widespread adoption of spectrometry in everyday technology, making it as commonplace as temperature sensors.