Spek is an acoustic spectrum analyzer using FFmpeg libraries for audio decoding and wxWidgets for the GUI.
It helps to analyse your audio files by showing their spectrogram.
This is free and open source software.
Key Features
- Supports all popular lossy and lossless audio file formats thanks to the FFmpeg libraries.
- Ultra-fast signal processing, uses multiple threads to further speed up the analysis.
- Shows the codec name and the audio signal parameters.
- Allows to save the spectrogram as an image file.
- Drag-and-drop support; associates with common audio file formats.
- Auto-fitting time, frequency and spectral density rulers.
- Adjustable spectral density range.
- Translated into 19 languages.
- Cross-platform support – runs under Linux, Mac OS X, and Windows.
Website: spek.cc
Support: GitHub Code Repository
Developer: Alexander Kojevnikov and contributors
License: GNU General Public License v3.0

Spek is written in C and C++. Learn C with our recommended free books and free tutorials. Learn C++ with our recommended free books and free tutorials.
Related Software
| Audio Analyzers | |
|---|---|
| Sonic Visualiser | View and analyse the contents of music audio files |
| Friture | Visualize and analyze live audio data in real-time |
| Spek | Acoustic spectrum analyser |
| projectM | Music visualizer originally based on Milkdrop |
| SongRec | Open source Shazam client |
| Cava | Cross-platform audio visualizer |
| sndpeek | Real-time audio visualization tool (animated, 3D) |
| MasVisGtk | Powerful and comprehensive audio analysis tool |
| Mousai | Simple application that can identify songs similar to Shazam |
| AudMeS | System for audio measurement through a sound card in the PC |
| Cavalier | Audio visualizer based on Cava |
| Open Sound Meter | Measurement application for tuning sound systems in real time |
| Le Biniou | Music visualization / VJing tool |
| Cavasik | Fork of Cavalier |
| GLava | OpenGL audio spectrum visualizer |
| Spek-rs | Acoustic spectrum analyser |
| Soundscope | Analyzing audio data |
| Partiels | Audio analysis tool |
| rtspeccy | Real time spectrum analyzer |
| FMIT | Graphical utility for tuning musical instruments |
| shaq | Bare-bones CLI client for Shazam |
| audioprism | Spectrogram tool for PulseAudio and WAV files |
| spectroterm | Curses based terminal spectrum analyzer |
| Music Radar | Simple application that can identify songs similar to Shazam |
| cli-visualizer | Command line visualizer for MPD, ALSA and PulseAudio |
Read our verdict in the software roundup.
Explore our comprehensive directory of recommended free and open source software. Our carefully curated collection spans every major software category.This directory is part of our ongoing series of informative articles for Linux enthusiasts. It features hundreds of detailed reviews, along with open source alternatives to proprietary solutions from major corporations such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. You’ll also find interesting projects to try, hardware coverage, free programming books and tutorials, and much more. Discovered a useful open source Linux program that we haven’t covered yet? Let us know by completing this form. |

