Maybe i am wrong

@chimpmode you’re not wrong, there are actually two different notation systems , and we actually had a lengthy discussion a long time ago on this issue in the first version of Hookpad:

Ultimately we’ve decided for the current version of Hookpad and Theorytab to follow the “common practice” labeling, where the Roman numerals are natural to the scale (and in our case are denoted using color of the chord block)