Spectralissime is a high-precision spectrum analyzer application designed for Windows, offering options of 60, 120, or 240 frequency bands. It delivers detailed real-time frequency analysis across the full audible spectrum from 20 Hz to 20 kHz, updating 10 to 100 times per second. The software builds on a refined band pass filter bank and draws from a long history of audio measurement expertise to combine simplicity with essential analytical functions.

The application supports various audio input sources, including WDM, KS, MME, and ASIO devices, and can handle up to 64 input/output channels on ASIO hardware. Users can select two channels labeled A and B, with analysis options available for each channel individually or combined in different ways. Spectralissime also receives audio streams over local networks via VBAN, allowing flexible deployment across multiple devices. Additionally, it offers monitoring features by selecting alternate audio output devices to listen to the analyzed signals.

Spectralissime enhances audio analysis by providing multiple display scales for gain and frequency, including dB SPL and octave or decade frequency representations. It can function as a precise measurement tool when paired with a calibrated microphone, featuring adjustable calibration settings for accurate acoustic readings. This donationware application is free to download and use, with flexible licensing that supports all users. Compatible with a wide range of Windows versions, Spectralissime is an accessible and powerful tool for detailed audio spectrum analysis.