FretVisualizer

Fretvisualizer.com is a free, web-based resource created to assist musicians, particularly those learning music theory, in understanding the layout of notes on a fretboard. The tool provides a clear visual representation of keys and scales across the neck of instruments such as the guitar, bass, mandolin, and ukulele, with the potential for other instruments to be added. The site is straightforward to use, completely free, contains no advertisements, and doesn't require any user registration. It serves as a practical aid for visualizing musical concepts directly on the fretboard.