Tool for labeling audio

You could try the ones below:

1. audio-annotator

A JavaScript interface for annotating and labeling audio files.

2. audio-labeler

An in-browser app for labeling audio clips at random, using Docker and Flask. [![enter image description here][4]]

3. EchoML

Play, visualize and annotate your audio files

4. peak.js

Browser-based audio waveform visualization and UI component for interacting with audio waveforms, developed by BBC UK.

5. wavesurfer.js

Simple annotations tool, check the example.

[![enter image description here][10]]

Audacity is a free and open source audio editing software, available for all common desktop operating systems. It can be used to annotate audio, by using Label Tracks. You can have a label at a certain position, or covering a selection of time.

Annotating

1. Open or import your audio into Audacity
2. Select the audio track you want to annotate.
3. Click Track -> Edit -> Labels -> Edit Labels to add a new Label track
4. Select where in the track you want to annotate
5. Insert new label using keyboard shortcut Ctrl + B

Repeat until done with the track.

Export annotations

Export the labels using File -> Export -> Export Labels

Loading annotations

To load the labels into Python, you can use this snippet of code:

import pandas

path = 'PATH/TO/FILE'
labels = pandas.read_csv(path, sep='\t', header=None,
                        names=['start', 'end', 'annotation'],
                        dtype=dict(start=float,end=float,annotation=str))

Try this one: https://labelstud.io, it is a free opensource tool via web browser with a good documentation and a lot of examples. Easy to start.

Or if you need a teamwork you can use the labeling platform: https://heartex.ai.