4-String Bass Guitar Fretboard Chart
4-string bass (E–A–D–G) · map any scale or arpeggio across the neck
How to play
- Pick a root and a pattern (scale or arpeggio). Every note of that pattern lights up across the whole neck, each labelled by its interval (1 = root, 3, 5, ♭7…), with the root in purple.
- Tap any lit note to hear it. Play pattern runs the notes up from the root so you hear the shape. The dots under the fret numbers are the neck markers (3, 5, 7, 9, 12).
- Bass patterns are movable: the same shape works for any root — just slide it. An octave is always 2 frets up and 2 strings across.
- Strings read top-to-bottom G D A E (thick low E at the bottom), like bass tab. Vol sets volume. Keyboard: Tab + Enter/Space.
It gives you whole fretboard of a four-string bass guitar to play around with. You can navigate it using your computer keyboard, click on the notes with your mouse, and hear them sounding as part of an arpeggio or scale. It turns music theory concepts into something real, like a map you can travel through while also listening to the sounds you play.
Firstly, select your root note. The ones available is shown above. You get to choose whichever note you wish from C, B (both with sharps and flats). Based off this note, everything else on the neck are based around that key centre. The fretboard will then automatically update to highlight where it sits on each of the four string.
How to Use the Bass Guitar Tool
Finally, choose a pattern from the list alongside the root. You have options like triad arpeggios, pentatonics, minor and major scales, and even blues scales. The relevant notes will light up on the fretboard. To assist with finding your way inside the pattern, all of the root notes is highlighted in purple. All other notes show their interval number for clarity as well.
To listen to the pattern play up the neck, select the shape and hit the Play Pattern button. It will then play the notes through and give you an idea of what the pattern sounds like. This is great for ear training, or if you are unsure how the pattern feel in a given key. Simply replay as necessary.
When you click on a lit note, that note is played. You can then listen to each one by itself and get used to the pattern. You can also bounce from note-to-note to test intervals or create phrases in your head. When the notes are played they only flash for a brief time so you can see what is being heard.
The bottom right corner has a volume slider that adjust the overall level of everything you create, meaning the sound coming out off your computer. Make sure it’s loud enough to hear clearly. Want it quieter? Turn it down! Louder? Turn it up.
The fullscreen button enlarges the fretboard so that it fills your screen. This provides additional space and allows you to view the location of the notes more easilly. On a small screen, this might be even more helpful, or you may just want to focus on instrument map. Exit fullscreen by re-clicking the fullscreen button.
To make things smoother, it supports keyboard navigation. Simply hit the Space or Enter key on your keyboard to toggle controls and use the tab key to move from one control to another. If you don’t want to use a mouse, this should of make the tool accessible. Standard focus cues will help you get around the interface.
Spend a few minutes comparing the appearance of various patterns on the neck. You’ll see that the blues scale has several common notes with the minor pentatonic. You’ll also see where the arpeggios draws attention to the chord tones of each shape in the larger scale. The movement of the root note demonstrate how the pattern will move around the entire fretboard. Tapping out each note individually as you play the pattern helps close the gap between what you are hearing and knowing how it goes. Test it in keys you may not be an expert on, and try how the shapes sounds on your instrument. Spot where the fingerings could be more suitable for you from the visual map.
There’s also an option to bring up the help panel, which will remind you how to use the controls. It’ll be a helpful reference point for using the interface, including the interval labels. All the info is brief and only appears if needed. Just turn it on/off whenever you want.
The idea is that this will be an instant feedback, easy-to-use tool for practicing quickly. You won’t have to set anything up or fuss with gear. Just dive right in and work on understanding the geometry of the fretboard. Pick out a key you know well and one of the patterns you’ve been trying. Begin tapping the notes and follow the shapes through the string groupings.