FastChords uses the chord symbols convention presented in About Chord Symbols because it is clear and unambiguous.  Unfortunately, that is not the case in many other representations where alternate conventions are followed.  To add to the confusion, symbols used in some countries are very different from those used in the USA.  For example, The small triangle, , is often used in Europe to denote a major chord.

And then there are alternate ways of writing the same chord that complicates matters.  Fortunately for you FastChords "knows" about these synonyms and in most cases can map them to the correct chord representation on the keyboard.

In general, and except for alterations affecting the root and for augmented chord that use the plus (+) sign, you will see equally often the plus (+) symbol used instead of the sharp (#) symbol, and the minus (-) symbol substituting the flat () symbol, particularly in jazz.

So here is a partial list of synonyms.  The only ones that FastChords cannot decode in the current version are those using the triangle symbol.  The chords listed below all have a common root of C.

When two symbols appear on the same line in the left column, that means the two versions are available via the chord calculator in FastChords.  See Reversible Buttons.

chord

synonyms

C , CMa , CMAJ

CM , Cmaj , C

CMa7, CMAJ7

CM7 , Cmaj7, C , C7, Cj7

Cm , Cmin

C-

Cm7 , Cmin7

Cmi7 , CMI7 , C-7

C+ , Caug

C#5 , C(#5) , C5+ , C+5

C+7, Caug7

C7(#5) , C7+5 , C7/#5 , C7/5+

C , Cdim

C7 , Cdim7

C , Cdim

C7

Cm7(5) , Cm75 , Cm7(-5) , C , 1/2dim7 , Cm7/5

C6

CMa6 , CM6

Cm6 , Cmin6

C-6

C6/9

C6(add9) , C6add9 , CMa6(add9) , CMadd9

CmMa7

Cm(Ma7) , Cm(#7) , CMa73 , Cm(addMa7) , Cm/Ma7 , Cm,#7

Cm7 , Cmin7

C-7 , CMI7

C9

C7(add9) , C7add9 , C7/9 , C2

CMa9

C(add9) , CMa7(add9) , Cm7(add9)

C7sus4

Csus4 , Csus , C4

C2

C(add9) , Cadd9

Csus2

Cadd9(no3)

Cadd9

C2

Cadd11

C4