https://f-droid.org/packages/net.pmarks.chromadoze/

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Chroma Doze

Noise generator
Generates noise with a custom colour profile. It is intended to be
used as a
sleep sound generator. It provides rapid feedback to adjustments in
the
spectrum, and is designed to minimize CPU usage in the steady state.

It works by running shaped white noise through an Inverse Discrete
Cosine
Transform, generating a few megabytes of distinct audio blocks. The
steady-state
behavior selects blocks at random, and smoothly crossfades between
them

  * Author: Paul Marks
  * License: GNU General Public License v3.0 only
  * Issue Tracker
  * Source Code
  * Build Metadata

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.

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  * Version 4.2 (28) suggested Added on 2023-02-09

    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
      + prevent phone from sleeping
        Allows the app to prevent the phone from going to sleep.
      + run foreground service
        Allows the app to make use of foreground services.
      + 
    Download APK 1.2 MiB PGP Signature | Build Log

  * Version 3.7.1 (25) - Added on 2018-06-20

    This version requires Android 2.2 or newer.

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

    Permissions
      + prevent phone from sleeping
        Allows the app to prevent the phone from going to sleep.

    Download APK 0.8 MiB PGP Signature | Build Log

  * Version 3.6 (23) - Added on 2018-02-06

    This version requires Android 2.2 or newer.

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

    Permissions
      + prevent phone from sleeping
        Allows the app to prevent the phone from going to sleep.

    Download APK 0.9 MiB PGP Signature | Build Log

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