Visualize and inspect local audio files with detailed spectrogram analysis.
Audio Spectrogram Analyzer shows how a local audio recording is distributed across frequency and time. Open a file on Windows, Mac, or iPhone, inspect the spectrogram, and export an image when you want a still frame of what you see.
Selected files stay on the device. The apps do not require an account and do not upload your media to H61 Apps.
Minimum OS: macOS 15.0 (Apple silicon)
Native Mac app for local spectrogram inspection and export on Apple silicon. Decodes with AVFoundation, with bundled FFmpeg and FFprobe helpers for additional formats.
Minimum OS: Windows 10 version 19041
Native Windows desktop app for local spectrogram and waveform inspection. Uses bundled FFmpeg and FFprobe for decode and metadata rather than PATH-installed tools.
Minimum OS: iOS 18.0
Native iPhone app for local spectrogram inspection. Decodes with AVFoundation and uses statically linked FFmpeg when needed for additional formats.
Getting started, export, batch work, and troubleshooting.
Install the app on your device, then open a local audio or video file you want to inspect. The spectrogram is generated on the device.
On Windows and Mac, use the File menu or drag a file onto the window. On iPhone, choose a file with the system picker. The apps do not scan your music library or storage on their own.
On Windows, Mac, and iPhone you can switch the frequency axis between Full Sample Rate and Nyquist. Use Full Sample Rate when you want the complete recorded bandwidth. Use Nyquist when you want the conventional half-sample-rate view.
Export writes a PNG or JPEG image of the current spectrogram. On Mac you can save next to the source file or into a folder you select. Existing names are handled with collision-safe naming. On iPhone, you can save an exported image with permission only to add it to Photos.
Windows and Mac support batch processing for multiple files. On Windows, Batch mode uses a sidebar file list. On Mac, Batch Queue lets you add multiple files, choose PNG or JPEG output, and export each spectrogram next to each source file or into one selected folder. iPhone does not currently support batch processing.
Shortcuts differ by platform.
macOS
Windows
For product questions or to report a problem, email contact@h61apps.com or use the H61 Apps contact page.
Include the app name, platform (Windows, Mac, or iPhone), version or build, system version, file type, and what happened. Attach an Activity Log export only if you are comfortable sharing it.
Proprietary H61 Apps software with bundled FFmpeg and FFprobe components that run locally. The Mac and iPhone App Store listings are coming soon. Corresponding FFmpeg 8.1.2 source and build information is published on this website.
The apps open user-selected audio and some video files so the embedded audio can be inspected. Common examples include AAC, MP3, FLAC, ALAC, WAV, AIFF, Opus, and Vorbis. A file extension is not a guarantee that every codec inside that container can be decoded.
On Mac, Apple frameworks handle many common files. Bundled FFmpeg and FFprobe helpers may be used as a local fallback for additional formats. On Windows, bundled FFmpeg and FFprobe handle local decoding. Compatibility depends on the file, not only on the extension.
Analysis runs on the device. Media files are not uploaded to H61 Apps. The apps do not require an account and do not use analytics, telemetry, advertising identifiers, or tracking. See the Privacy Policy for the full Audio Spectrogram Analyzer section.
Audio Spectrogram Analyzer is proprietary H61 Apps software. The app source is not available under an open-source license.
The app includes FFmpeg and ffprobe components from the FFmpeg project. Those bundled FFmpeg components are distributed under LGPL v2.1 or later for this build. They are separate from the proprietary application.
Corresponding FFmpeg source and build information are available at the site’s FFmpeg 8.1.2 corresponding-source page .
