<p>This study presents the development and applications of a low-cost, do-it-yourself (DIY) optical spectrometer utilizing a webcam as a sensor. The device aims to make spectroscopy accessible to educators, students, and independent researchers by offering a cost-effective alternative to commercial spectrometers. The research covers the selection of optical components, design, and calibration methodologies. The performance of the spectrometer was evaluated by measuring the emission spectra of various light sources. Results indicate that the device can achieve a resolution comparable to commercial systems within a limited spectral range. Potential applications include chemical analysis, environmental monitoring, and educational demonstrations. Limitations and suggested improvements, such as enhancing resolution and sensitivity, are also discussed.</p>