Cultist Purple vs Arianrhod Blue

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Arianrhod Blue is noticeably darker, more saturated than Cultist Purple.

Can I use Arianrhod Blue instead of Cultist Purple?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Arianrhod Blue is noticeably darker, more saturated than Cultist Purple.

Can I use Cultist Purple instead of Arianrhod Blue?

The same difference applies the other way round: Cultist Purple is noticeably lighter, more muted.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.