#66CDAAMedium Aquamarine (#66CDAA) is a light, soft blue-green with an OKLCH hue of 169°, lightness 0.78 and chroma 0.11. 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 | #66CDAA |
|---|---|
| RGB | rgb(102, 205, 170) |
| HSL | hsl(160, 51%, 60%) |
| HSV | hsv(160, 50%, 80%) |
| CMYK | cmyk(50%, 0%, 17%, 20%) |
| CIE Lab | lab(75.7 -38.3 8.3) |
| OKLCH | oklch(0.777 0.110 169) |
Under warm 2700K interior light Medium Aquamarine shifts subtly: drifts toward green; in north-facing or shaded light it shifts subtly: leans toward sky blue. Overall drift across common illuminants is small (max ΔE ≈ 2), so it is a lighting-stable choice.
#78c89e — ΔE 2.0, shifts subtly: drifts toward green#71cea6 — ΔE 1.1, shifts subtly: drifts toward green#66cdaa — ΔE 0.0, is virtually unchanged#65cead — ΔE 0.4, shifts subtly: leans toward sky blueAgainst white it measures 1.93:1 and against black 10.88:1, 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.
#cdffeb · #66cdaa · #54b796 · #338f72 · #096950 · #004332
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.
#96eff4 · #79ded1 · #66cdaa · #6fb685 · #769f65 · #78874b
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.
#66cdaa · #71a0af · #358b70 · #00677f · #004e3a · #002e3a
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.
#c6e1d6 · #66cdaa · #c4759d · #2f5f4e · #144032 · #062219
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#faeef3 · #66cdaa · #8e9f98 · #635a5e · #192a24 · #020001
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.
#fbeef3 · #d3c4cb · #a7969e · #2f1c25 · #0b0005 · #66cdaa
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#d6dab4 · #66cdaa · #7bad76 · #e84037 · #483047 · #1b0d04
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#e3d0ae · #66cdaa · #da77d2 · #9d7d7a · #483546 · #071303
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#f1f0ff · #66cdaa · #9892ce · #8d471c · #421800 · #02000d
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#eaf2ff · #66cdaa · #799cd1 · #894067 · #352200 · #090003
#7ED5B6 · #93DDC1 · #A8E5CD · #BCEDD9 · #CFF5E5
#4BA98A · #2F866B · #11654E · #004533 · #00261B
#7CC9AD · #8EC4AF · #9EBFB2
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.