Sersential transforms complex nanoplasmonic calculations into a simple, interactive tool for researchers and engineers working with surface-enhanced Raman spectroscopy. By combining nanogap size, excitation wavelength, field enhancement, and molecular polarizability, the app delivers instant estimates of Raman signal amplification and molecular detection thresholds. With dual modeling approaches hotspot confinement and diffraction-limited optical volume Sersential provides deeper insight into how design choices affect experimental sensitivity. Its clean interface, animated visuals, presets for common conditions, calculation history, and export options make it more than just a calculator it’s a compact research companion for exploring and optimizing SERS performance.