iReal Pro supports a wide range of chord qualities. The chord picker in the Editor always shows every one the current version offers: open it with the ... button beside the chord box, or from the quality dropdown on Mac and Windows.

 

A few are compact symbols rather than letters. - is minor, ^ is major 7 and prints as a triangle, o is diminished, ø is half-diminished, and + is augmented. Type nothing after the root for a major triad.

 

Most qualities accept more than one spelling, and iReal Pro rewrites what you type into its own notation: Cm7 becomes C-7, Cmaj7 becomes C^7, and Cm7b5 becomes Ch7.

 

The article lists every quality with all of its accepted spellings.

 

For the full guide, see Chord symbols and notation on the iReal Pro website.