Spectrolite is an iPhone application developed by Araneus Information Systems Oy. It is a free utility tool that visualizes the frequency content of sound in real time through spectrograms. The app specializes in constant-Q spectrograms, offering a logarithmic frequency scale for a perceptually and musically meaningful display, with support for linear and mel frequency scales in version 2.0.

Covering the full frequency range of human hearing, Spectrolite allows intuitive touch panning and zooming for detailed exploration of the spectrograms. The Pro in-app purchase enhances the tool by adding grids and scales for time, frequency, and amplitude, along with a spectrum view and tap-to-measure function, transforming Spectrolite into a comprehensive audio measurement tool.