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Audio Spectrum Analyzer

A handy real-time audio spectrum and spectrogram analyzer
New in version 1.8
Library updates
Bugfixes
Spectrum Spectogram Analyzer was designed with accuracy and easy of use in mind. It can be used for monitoring or measuring environmental sound or noise; help tuning instruments; timing short sound events; and educational purpose.


Features:

* No Ads.
* With log or linear frequency axis.
* Can label frequency axis using music pitch note.
* Support all possible sampling rates and almost all recorder sources of your device.
* Graph with nice grid lines and labels, easy to operate.
* FFT sample size range from 512 to 8192. Using half-overlapped (adjustable) time window to increase time resolution.
* Various window functions provided, for different frequency resolution and dynamical range.
* Peak frequency detection (in unit of Hz and note+cent), with a moderate accuracy (FFT + interpolation).
* With dB or A-weighting dB (dBA).
* Can record the audio in wav (PCM) format.
* Pinch to zoom, drag or swipe to move, long-press to place cursor, double touch to reset zoom.

Notes: May need some knowledge of discrete Fourier transform and spectrum analysis to use it well. The actual accuracy mainly depends on your device. No calibration interface provided.

Comments and suggestions are welcome.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 1.8 (180) suggested Added on 2022-06-17

    This version requires Android 4.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • record audio
      This app can record audio using the microphone while the app is in use.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • control vibration
      Allows the app to control the vibrator.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.

    Download APK 1.3 MiB PGP Signature | Build Log

  • Version 1.7 (170) - Added on 2022-06-05

    This version requires Android 4.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • record audio
      This app can record audio using the microphone while the app is in use.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • control vibration
      Allows the app to control the vibrator.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.

    Download APK 1.3 MiB PGP Signature | Build Log