Kinda sad that there is no distinction made between color selection and color production. RGB based color opponents (e.g. red - cyan, green - purple) are less pleasing to the eye and culturally relevant than RYB ones (red - green, yellow - purple).
Let's say you develop a luxury theme, the yellow - purple opponency would naturally lead you to the classic colors of royality, purple and gold.
Let's say you develop a luxury theme, the yellow - purple opponency would naturally lead you to the classic colors of royality, purple and gold.
A good RYB based picker is the good old Paletton: https://paletton.com/