OFFLINE RF ANALYSIS · LINUX

Find your signals.
See the spectrum.

Turn your RF recordings into a clearer picture. Explore spectrum, waterfall, and waveform views in one focused desktop workspace.

Get CroccoSpectrum Explore the source

Free & open source · Linux x86_64 · No RF hardware required

CroccoSpectrum's cyan and blue rooster mascot above a spectrum and waterfall, with the tagline Crunch through your RF recordings
Spectrum & waterfall Large recording support Desktop & command line C++20 / Qt 6 / FFTW

A CLOSER LOOK

Your recording. Every perspective.

Follow a signal through frequency and time.
Keep the views connected, and the detail in reach.

CroccoSpectrum / analysis workspaceNATIVE LINUX APP
CroccoSpectrum desktop showing a frequency spectrum, a Baudline waterfall with narrow signals, a chirp, and a short burst, and an I/Q waveform, alongside recording and analysis controls
A synthetic 100 MS/s I/Q recording, viewed in CroccoSpectrum.

BUILT FOR THE ANALYSIS

Less friction. More signal.

All capabilities
01 / EXPLORE

See what’s in the recording.

Zoom through spectrum, waterfall, and waveform views. Linked navigation and cursor readouts keep you oriented.

Frequency. Time. Amplitude.
02 / GO DEEPER

Big files. Precise analysis.

Read recordings in bounded blocks. Calculate exact interval averages, max hold, and full-scan waterfall overviews in the background.

Keep the detail. Keep control.
03 / TAKE IT FURTHER

From discovery to workflow.

Save sessions and bookmarks. Export CSV, plot images, or original samples. Use headless tools for command-line analysis.

Your data, ready for the next step.
BRING YOUR RECORDINGS

Raw binary / Real & complex I/Q / Single-stream SigMF / Integer & floating point

READY WHEN YOU ARE

Meet your next signal.

Download the stable release and open your first recording.

Find the newest packages on GitHub Releases.
EASIEST WAY TO START

AppImage

One file. Make it executable, then launch.
Application libraries included.

View AppImage releases

Linux x86_64 · .AppImage

EXTRACT & RUN

Portable archive

Extract the folder and launch AppRun.
A ready-to-run alternative to AppImage.

View portable releases

Linux x86_64 · .tar.gz

For Linux x86_64 with glibc 2.39 or later (Ubuntu 24.04+ baseline). X11 or Wayland. System requirements

Release notes All releasesBuild from source

Latest development build

Try the newest features from devel and help test the next release. Development builds may contain unfinished changes.

Find development builds on GitHub Releases.
View development AppImages

Linux x86_64 · .AppImage

View development archives

Linux x86_64 · .tar.gz

Development changes and build details

FROM FILE TO FIRST SIGNAL

Up and exploring
in three steps.

Read the quick start
  1. 01

    Download & launch

    Make your AppImage executable in your file manager, or extract the portable archive and run AppRun.

  2. 02

    Open a recording

    Choose File → Open recording. Review the sample format, byte order, I/Q order, and sample rate.

  3. 03

    Follow the signal

    Explore the linked plots, select an interval, and run an exact analysis of the part that matters.