Triad Circles

Click on the Circle of 5ths (left) to cycle (clockwise) through the key centers.

Click on the Diatonic Circle (right) to cycle (clockwise) through scale degrees.

Click on the Mode or Scale (bottom right) to cycle through those.

The Triad of your current selection of Scale Degree, Mode, Scale, and Key Center is shown in the middle.  The Diatonic Circle also shows the Roman Numeral and quality of the triads for your selected mode & scale.