#6A7F8BCitadel (#6A7F8B) is a mid-tone, muted sky blue with an OKLCH hue of 233°, lightness 0.58 and chroma 0.031. It sits on the cool side of the color wheel. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #6A7F8B |
|---|---|
| RGB | rgb(106, 127, 139) |
| HSL | hsl(202, 13%, 48%) |
| HSV | hsv(202, 24%, 55%) |
| CMYK | cmyk(24%, 9%, 0%, 45%) |
| CIE Lab | lab(52 -4.8 -9) |
| OKLCH | oklch(0.584 0.031 233) |
Under warm 2700K interior light Citadel shifts subtly: leans toward blue-green; 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.
#717c82 — ΔE 1.5, shifts subtly: leans toward blue-green#6f8088 — ΔE 0.9, shifts subtly: leans toward blue-green#6a7f8b — ΔE 0.0, is virtually unchanged#6a808d — ΔE 0.4, is virtually unchangedTest Citadel 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 4.18:1 and against black 5.02:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text.
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.
#c4d5df · #9baeb9 · #6a7f8b · #51646f · #31424b · #14222a
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.
#73abaf · #5c98a8 · #6a7f8b · #4a6d91 · #48587d · #434568
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.
#b3b2e7 · #9797b0 · #6a7f8b · #37657d · #1d495e · #28273e
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.
#cbe8f8 · #ce9b7c · #6a7f8b · #505e67 · #274250 · #15252d
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f8f0eb · #8e989e · #6a7f8b · #65605d · #1f2a30 · #040201
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.
#ebf3f8 · #c1cbd1 · #6a7f8b · #1a2830 · #00070e · #f18a40
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#ffeee4 · #b58d74 · #6a7f8b · #835537 · #401e05 · #00060f
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffeee4 · #b98885 · #6a7f8b · #765d2b · #421919 · #0d0500
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffecf3 · #b5889a · #6a7f8b · #626631 · #292b00 · #040001
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#faedfb · #a98aac · #6a7f8b · #835537 · #123012 · #110300
#7F929D · #95A5AF · #ABB9C1 · #C1CDD4 · #D8E1E7
#566973 · #43535D · #303F47 · #1F2B32 · #0E191F
#6E7E88 · #727E84 · #757D81
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.