Auphonic is an online audio mastering service that offers a variety of features to help you improve the sound of your audio recordings. These features include:

Automatic mastering: Auphonic’s automatic mastering algorithm will analyze your audio and apply a number of settings to improve the sound, such as loudness, EQ, and compression.
Loudness normalization: Auphonic can normalize your audio to a specific loudness level, ensuring that your audio will sound consistent across different devices and platforms.
EQ: Auphonic’s EQ tool allows you to adjust the frequency response of your audio, making it sound more balanced and pleasing to the ear.
Compression: Compression can help to make your audio sound louder and more consistent.
Metadata: Auphonic can automatically add metadata to your audio files, such as the title, artist, and genre.

Auphonic offers a free plan that allows you to use up to 500 credits per month. Credits are used to process your audio files, and you earn 10 credits per day for free. If you need to process more than 500 audio files per month, you can upgrade to one of Auphonic’s paid plans.

To use Auphonic, you first need to create an account. Once you have created an account, you can upload your audio files to Auphonic’s website. Auphonic will then process your audio files and apply the selected settings. Once the processing is complete, you can download your audio files.

Auphonic is a great way to improve the sound of your audio recordings. It is easy to use and offers a variety of features to help you get the best possible sound. If you are looking for an online audio mastering service, Auphonic is a great option.

Here are some additional details about Auphonic:

It was founded in 2012 by Michael Weiss and is based in Berlin, Germany.
It has over 100,000 users worldwide.
It supports a variety of audio formats, including WAV, MP3, AAC, and FLAC.
It offers a REST API that allows you to integrate Auphonic with your own applications.