#663399Rebecca Purple (#663399) is a dark, saturated purple with an OKLCH hue of 303°, lightness 0.44 and chroma 0.16. It sits on the transitional side of the color wheel. In practice it behaves as an accent color: strong in focal moments, dominant over large fields.
| HEX | #663399 |
|---|---|
| RGB | rgb(102, 51, 153) |
| HSL | hsl(270, 50%, 40%) |
| HSV | hsv(270, 67%, 60%) |
| CMYK | cmyk(33%, 67%, 0%, 40%) |
| CIE Lab | lab(32.9 42.9 -47.1) |
| OKLCH | oklch(0.440 0.160 303) |
Under warm 2700K interior light Rebecca Purple shifts subtly: leans toward magenta; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.5), so it is a lighting-stable choice.
#683390 — ΔE 1.5, shifts subtly: leans toward magenta#693496 — ΔE 0.8, shifts subtly: leans toward magenta#663399 — ΔE 0.0, is virtually unchanged#66339b — ΔE 0.3, is virtually unchangedTest Rebecca Purple in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 8.41:1 and against black 2.5:1, so white text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid black text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#b491e2 · #9168c2 · #663399 · #4c1879 · #280048 · #080016
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#5a6ebd · #6152af · #663399 · #621d73 · #59044d · #47002a
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#d894ad · #d45c90 · #945b71 · #663399 · #481d70 · #2d004f
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#b0d554 · #9c86bb · #776b89 · #663399 · #3f285a · #201330
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#eff5e4 · #b0a8be · #6a6e63 · #663399 · #3f364b · #010100
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#eff4e8 · #c6cbbe · #999f90 · #202614 · #030500 · #663399
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#c6dfbf · #cdbc4e · #605aa5 · #663399 · #32432f · #1c0519
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#c6e3c6 · #cdc67b · #4a735f · #663399 · #374437 · #1c0518
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffefe0 · #e5994e · #007d71 · #663399 · #00453e · #180700
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffede9 · #f28d76 · #5d7700 · #663399 · #00434e · #010300
#7D53AD · #9572C1 · #AD90D5 · #C7AFE8 · #E1CEFB
#562784 · #471C6F · #38105B · #2A0547 · #1C0035
#623D8B · #5D457C · #594B6D
Its chroma is high enough to carry accents, calls to action, and focal moments; large fields of it will dominate a composition. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.