#00FFEFTurquoise Blue (#00FFEF) is a very light, saturated blue-green with an OKLCH hue of 187°, lightness 0.9 and chroma 0.157. 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 | #00FFEF |
|---|---|
| RGB | rgb(0, 255, 239) |
| HSL | hsl(176, 100%, 50%) |
| HSV | hsv(176, 100%, 100%) |
| CMYK | cmyk(100%, 0%, 6%, 0%) |
| CIE Lab | lab(90.7 -52.6 -6.5) |
| OKLCH | oklch(0.900 0.157 187) |
Under warm 2700K interior light Turquoise Blue shifts noticeably: leans toward green, loses intensity; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 2.6), so it is a lighting-stable choice.
#55f9df — ΔE 2.6, shifts noticeably: leans toward green, loses intensity#3cffea — ΔE 1.1, shifts subtly: leans toward green#00ffef — ΔE 0.0, is virtually unchanged#00fff2 — ΔE 0.4, is virtually unchangedTest Turquoise Blue 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 1.27:1 and against black 16.55:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid white 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.
#00ffef · #00e7d9 · #00bbaf · #009087 · #006861 · #00423d
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.
#d0fbff · #00ffef · #43e9bd · #64d28f · #79b866 · #859e42
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.
#00ffef · #8ec6eb · #00b7ab · #0089c7 · #00736b · #074d71
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.
#00ffef · #99c5bf · #d95d7d · #00665f · #004540 · #002623
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#00ffef · #cebbbe · #728d8a · #5a4d4f · #062724 · #030001
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.
#fceef0 · #d5c4c7 · #a9979a · #311c21 · #0d0103 · #00ffef
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#00ffef · #b8d3b6 · #f22f61 · #4d6e4d · #432c41 · #200619
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#00ffef · #ddb5bc · #b667a3 · #902600 · #3f0034 · #220100
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#00ffef · #c9bada · #9b71c2 · #744500 · #331a00 · #05000f
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#00ffef · #b9bfe0 · #747ed2 · #921843 · #282100 · #140003
#5BFFF1 · #7FFFF2 · #9AFFF4 · #B0FFF6 · #C4FFF8
#00D0C3 · #00A398 · #007870 · #00504A · #002B27
#6BF9EB · #95F2E8 · #B4EBE4
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.