Spek is free software available for Unix, Windows, and Mac OS X. It Supports Popular lossless audio files formats, uses multiple threads for faster analytics, ultra-fast signal processing, and a high n number of frequency bands for the best spectrogram quality; spectrograms can be saved as images with drag and drop support.
Spek is a lightweight windows application whose purpose is to help you build the spectrogram for an audio file in order to analyze the frequencies comprised in a sound. The layout is intuitive enough to be configured without having to consult a help manual or watch online tutorials, the program uses the GNOME platform, which includes the Lib, GTK+, Cario, Pango, as well as the FFmpeg Libraries.
Spek was desinged with an overall simplicity in mind, so it doesn't comprise many configuration settings; you are allowed to upload the audio files into the working environment using the built-in browse function or drag and drop operations. During our testing, we noticed that Spek carries out a task quickly and no errors showed up throughout the entire process; it is not quite friendly with system resources, so the overall performance of the computer may be hampered.
To sum things up, speak offers a simple yet efficient software solution when it comes to helping you generate spectrograms it can be easily installed and configured by all types of users regardless of their experience level