Freedom to Play

Chords & Scales
for Guitar, Bass & Ukulele

in every mode & key

Bring Your Own Strings

Guitar, Bass & Ukulele

Not just for guitarists. StringTheoryPRO works for bass guitar and ukulele too.

Working on a new song? Share a chord chart with your band mates and everyone can play along.

Show notes as finger
Show notes as interval
Show notes as name
Show notes as finger
Show notes as interval
Show notes as name
Show notes as finger
Show notes as interval
Show notes as name

Chords · Chords · Chords

Chords that are Meant for Each Other

The average chord dictionary is a large collection of random chords with zero context. Useful for looking up a specific chord - but what if you're not sure what chord your looking for?

When you know what works, you can focus on making music!

StringTheoryPRO helps you find just the right chords to play together. Chords are shown in context with a musical key, so you can have fun experimenting with different combinations with confidence.

A Creative Boost

Chord Progressions

StringTheoryPRO includes a collection of the most useful chord progressions across multiple genres. Chord progression can be instantly transposed to any key or mode. Use them for inspiration, experiment just for fun or incorporate one into your next song.

1
vi
A min
IV
F Maj
I
C Maj
V
G Maj
2
vi
A min
IV
F Maj
V
G Maj
V7
G7
Show notes as finger
Show notes as interval
Show notes as name

Master the Fretboard

CAGED: Chords in Every Position

Every chord can be played in 5 different positions using the 5 chord forms (C, A, G, E, D). It doesn't stop with chords - knowing how to locate the CAGED shapes helps with soloing too.

Learning the CAGED chord forms is one of the best ways to improve your knowledge of the fretboard.

StringTheoryPRO let's you easily switch between the 5 CAGED chord forms for any chord.

Finding Every Note

Scales in Key

Learning scales is a core component to mastering your instrument. Scales are for more than just practicing - they are a way of learning to find the notes you need to make the sounds you want.

A key concept is pairing the correct scale with the key and mode of your chord progression. StringTheoryPRO makes this a breeze, by always grouping the scales that match your selected key and mode.

  1. B

  2. C

  3. D

  1. G

  2. A

  1. D

  2. E

  3. F

  1. A

  2. B

  3. C

  1. E

  2. F

  3. G

  1. B

  2. C

  3. D

  1. Lydian Dreamy, Light, Uplifting
  2. Ionian Cheerful, Bright, Optimistic
  3. Mixolydian Playful, Warm, Friendly
  4. Dorian Soulful, Mellow, Expressive
  5. Aeolian Gloomy, Emotional, Introspective
  6. Phrygian Dark, Exotic, Mysterious
  7. Locrian Tense, Dark, Unsettling

Feeling Moody?

A Mode for Every Mood

The struggle is over... It's easier than ever to play with modes. StringTheoryPRO allows you to instantly switch between modes. Chords, scales, progressions are automatically transposed into the mode of your choosing.

Most of us are familiar with the Major and Minor modes - there are actually seven different modes, each with their own unique sound qualities. Experiment with using modes to affect the character of your music.

Mild, Medium or Spicy?

Chords that Add Flavor

Searching for the perfect chord to complete your progression? StringTheoryPRO suggests chords that fit your key and mode. These include borrowed chords from parallel keys, modal interchange chords and other non-diatonic options. Use these to add color and character to your music.

Frequently Asked Questions

Any Questions?

StringTheoryPRO is a web based application that helps guitar, bass, and ukulele players to find chords, scales, and modes to play together. It is not a teaching method but rather a tool to help you apply music theory in a practical way.
StringTheoryPRO is free to use with access to some keys and modes reserved for PRO subscribers. The free tier features include everything available to PRO users, just limited to certain keys and modes.
StringTheoryPRO is already free to try. Please feel free to start using it right away. No credit card is required to sign up for a free account.
Yes! StringTheoryPRO works with guitar, bass, and ukulele. More instruments may be added in the future.
Currently, there is no mobile app version of StringTheoryPRO. However, the web application is fully responsive and works well on other devices too. You can access it from your mobile browser. We suggest using a tablet for the best experience on mobile devices.
Yes! StringTheoryPRO supports many different ways of thinking about chords and scales on the fretboard. Every chords in StringTheoryPRO can be shown in all five CAGED positions.