XiFEO

Mainly developed to help users with mobile audio players with limited storage as well as for streaming services that want to make the most out of their available bandwidth, XiFEO is a simple yet thoroughly-efficient audio entropy optimizer that promises to promises between 30% and 50% compression rates with as little quality loss as possible.

It can be effortlessly deployed on your computer thanks to a typical, wizard-based installer and working with is just as simple thanks to a relatively intuitive UI that also comes with support for drag and drop.

First and foremost, you should know that this application only works with FLAC, WAV, AIFF, ALAC, and MP3 audio files. However, please note that it only comes with support for 24-bit files with frequencies values anywhere between 44.1 and 384 kHz and that the output format is only available as FLAC.

Other than that, things are quite straightforward: simply load the file using the dedicated button or by dragging and dropping them from their location onto the app's main window, choose between two processing methods (multi-threading and single-threading), choose the filter, bit truncation, and compression level values, the output folder and that's about it, really.

You can choose the between 8-bit truncations levels, and just as many regarding the file compression. Last but not least, the app also provides you with the possibility to pick the filename's structure and metadata contents.

Taking everything into account, XiFEO is not exactly the most specialized audio tool of this sorts out there, but, in fact, we can't really reproach anything since it does its job quite valiantly and, let's not forget, in an intuitive and timely fashion. Even better, it also works on macOS.