#0034ABBlue Hour (#0034AB) is a dark, saturated blue with an OKLCH hue of 263°, lightness 0.39 and chroma 0.195. It sits on the cool side of the color wheel. In practice it behaves as an accent color: strong in focal moments, dominant over large fields.
| HEX | #0034AB |
|---|---|
| RGB | rgb(0, 52, 171) |
| HSL | hsl(222, 100%, 34%) |
| HSV | hsv(222, 100%, 67%) |
| CMYK | cmyk(100%, 70%, 0%, 33%) |
| CIE Lab | lab(27.8 35.3 -66.6) |
| OKLCH | oklch(0.391 0.195 263) |
Under warm 2700K interior light Blue Hour shifts subtly: leans toward purple, loses intensity; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.9), so it is a lighting-stable choice.
#1535a1 — ΔE 1.9, shifts subtly: leans toward purple, loses intensity#0c36a8 — ΔE 0.9, is virtually unchanged#0034ab — ΔE 0.0, is virtually unchanged#0034ad — ΔE 0.3, is virtually unchangedTest Blue Hour 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 10.1:1 and against black 2.08:1, 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.
#6997f2 · #3e6fd4 · #0034ab · #002281 · #00004f · #000012
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.
#007097 · #005993 · #0034ab · #2c148e · #300067 · #28003d
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.
#d5a6eb · #6798fc · #a850cb · #754f87 · #0034ab · #001e76
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.
#f9b800 · #6483be · #526486 · #0034ab · #0a245d · #020c2d
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#fbf1de · #98a5be · #645d51 · #0034ab · #222e46 · #0a0400
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.
#f7f1e6 · #d1cbbe · #a8a092 · #362c1b · #140b00 · #0034ab
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#fff0d4 · #d29a00 · #795800 · #0034ab · #3e2a00 · #000012
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#c6debe · #b2ad7b · #b37251 · #4e5f4b · #0034ab · #05131b
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffedec · #f77876 · #007304 · #0034ab · #003a00 · #080000
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffecf3 · #ed78ad · #795800 · #0034ab · #00382b · #0d0500
#2757BF · #4B78D2 · #6F97E5 · #94B6F8 · #C0D6FF
#002A94 · #00207C · #001766 · #000D52 · #000044
#143D96 · #244281 · #31456B
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.