FretVisualizer is described as 'Fretvisualizer.com is a free, simple online tool designed to help musicians visualize notes, keys, and scales on the fretboard of various stringed instruments like guitar, bass, mandolin, and ukulele. It requires no sign-ups and has no ads' and is an website in the audio & music category. There are nine alternatives to FretVisualizer, not only websites but also apps for a variety of platforms, including Android, iPhone, Self-Hosted and Linux Mobile apps. The best FretVisualizer alternative is Fretboard, which is both free and Open Source. Other great sites and apps similar to FretVisualizer are Tabs Lite, UltimateGuitar.com, Fretastic and FretMap.