#577396Clean Slate (#577396) is a mid-tone, muted blue with an OKLCH hue of 254°, lightness 0.55 and chroma 0.064. 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 | #577396 |
|---|---|
| RGB | rgb(87, 115, 150) |
| HSL | hsl(213, 27%, 46%) |
| HSV | hsv(213, 42%, 59%) |
| CMYK | cmyk(42%, 23%, 0%, 41%) |
| CIE Lab | lab(47.6 -0.6 -22.2) |
| OKLCH | oklch(0.548 0.064 254) |
Under warm 2700K interior light Clean Slate shifts subtly: leans toward purple; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.7), so it is a lighting-stable choice.
#5e708c — ΔE 1.7, shifts subtly: leans toward purple#5c7493 — ΔE 0.9, is virtually unchanged#577396 — ΔE 0.0, is virtually unchanged#577498 — ΔE 0.4, is virtually unchangedTest Clean Slate 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 4.89:1 and against black 4.3:1, so white 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.
#b2c9e6 · #88a2c2 · #577396 · #3f5978 · #213752 · #05182f
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.
#6c9daf · #5c89a6 · #577396 · #515e88 · #4c4a71 · #453759
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.
#b9a1d3 · #9489a1 · #577396 · #3c5678 · #233b59 · #261c31
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.
#ddb989 · #88939f · #577396 · #425369 · #273648 · #121b26
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f6f1ea · #858c95 · #577396 · #5a5752 · #1e242c · #020100
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.
#e9f3ff · #bfcdde · #577396 · #1c2f46 · #000c23 · #f4b14b
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#d7dcb6 · #94c7d7 · #cc8d64 · #577396 · #72484d · #0f082e
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#fbf0e2 · #ab806e · #577396 · #5e5923 · #3c1806 · #040300
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffedee · #ad7d80 · #577396 · #456135 · #162a06 · #090001
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#feecf5 · #a67d94 · #577396 · #705123 · #002c1c · #130700
#6F88A7 · #879DB9 · #9FB3CB · #B9C9DD · #D3DFEF
#465F7E · #354B67 · #253951 · #16273C · #081628
#5D738E · #627287 · #68727F
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.