#99C1CCAquatic (#99C1CC) is a light, muted sky blue with an OKLCH hue of 216°, lightness 0.79 and chroma 0.045. 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 | #99C1CC |
|---|---|
| RGB | rgb(153, 193, 204) |
| HSL | hsl(193, 33%, 70%) |
| HSV | hsv(193, 25%, 80%) |
| CMYK | cmyk(25%, 5%, 0%, 20%) |
| CIE Lab | lab(75.6 -10.8 -9.9) |
| OKLCH | oklch(0.786 0.045 216) |
Under warm 2700K interior light Aquatic shifts subtly: drifts toward blue-green, loses intensity; in north-facing or shaded light it shifts subtly: leans toward blue. Overall drift across common illuminants is small (max ΔE ≈ 2.1), so it is a lighting-stable choice.
#a4bdbf — ΔE 2.1, shifts subtly: drifts toward blue-green, loses intensity#a1c2c8 — ΔE 1.2, shifts subtly: leans toward blue-green#99c1cc — ΔE 0.0, is virtually unchanged#99c2cf — ΔE 0.4, shifts subtly: leans toward blueTest Aquatic 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 1.93:1 and against black 10.85:1, 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.
#dcf7ff · #99c1cc · #84a9b4 · #62838c · #415f67 · #233c43
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.
#b2eae1 · #96d9dc · #99c1cc · #79afcb · #7598ba · #7082a6
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.
#99c1cc · #909ab2 · #4d8694 · #4d5d8a · #134c58 · #22293f
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.
#cde1e6 · #99c1cc · #bd8474 · #3b5d66 · #213e46 · #0f2126
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f9efed · #99c1cc · #93a0a3 · #635d5b · #1d292d · #030101
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.
#e6f5f9 · #99c1cc · #304950 · #112c33 · #000a0e · #ee6139
The same quiet ground carrying one bright gold voice — the high-energy pairing a cool or muted anchor cannot reach through its own temperature.
#e6f5f9 · #99c1cc · #304950 · #112c33 · #000a0e · #ecbd4d
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#ffede8 · #99c1cc · #bf9083 · #834f40 · #401a0f · #000407
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffede8 · #99c1cc · #be8e97 · #7b562d · #401822 · #120500
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#fcecf8 · #99c1cc · #b68fab · #6b5e28 · #2f2600 · #040002
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#f5eefe · #99c1cc · #a694bb · #834f40 · #1f2c04 · #050000
#A7CAD4 · #B5D3DB · #C2DCE3 · #D0E5EB · #DEEEF3
#7A9EA8 · #5D7D85 · #415D64 · #263E45 · #0E2228
#A0BFC8 · #A7BEC4 · #AEBCC0
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.