Scaler is a Windows program that serves as a plugin for digital audio workstation. It supports both audio and MIDI detection, and can determine what key and scale you are in and suggest chords to match your music. Alternatively, you may use a similar application called Onyx Arranger.

Brief review

The software provides a set of unique MIDI effects that makes finding chords and progressions quite intuitive. In addition, it comes with note and scaled detection, as well as suggestions and comprehensive but easy-to-use toolboxes for additional adjustments.

Suggest and create

When it comes to the program’s detection mode, it can listen to incoming MIDI or audio data, recognize the key of your music and suggest chord progressions that will fit. Moreover, you are able to lock the keys to your chords to create complex melodies by moving around on your input controller.

Extensive chord library

It is worth mentioning that the plugin comes with over four hundred song and genre-based chord sets, and over two hundred artist collections to give you an idea about various progressions and melodies. All you need to do is drag the desired chords into the sequencer and build unique patterns.

Features

free to download and use;
compatible with modern Windows versions;
gives you the ability to generate chord progressions;
automatically determines musical key and scale;
provides a wide range of custom chord sets;
supports drag-and-drop method.