#C9EFFF
Closest named color: Diamond (#B9F2FF). oklch(93% 0.045 225.2), rgb(201, 239, 255).
Aa
Black text reads best on this color (17.27:1).
About this color
#C9EFFF is a very light, muted teal or cyan. In OKLCH its lightness is 93%, its chroma 0.045 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Diamond (#B9F2FF), ΔE 0.019 away. Black text reads best on it, at 17.27:1.
| Hue family | Teals and cyans |
| Lightness | very light (93%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Diamond (#B9F2FF) |
| Black text | 17.27:1 |
| White text | 1.21:1 |
Values
| HEX | #C9EFFF |
| RGB | rgb(201, 239, 255) |
| HSL | hsl(198, 100%, 89%) |
| OKLCH | oklch(93% 0.045 225.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #C9EFFF | 1.21:1 | Fails | Lc -12.3 | Not readable |
| Black text on #C9EFFF | 17.27:1 | AAA | Lc 93.0 | Preferred for body text |
| #C9EFFF text on white | 1.21:1 | Fails | Lc 10.6 | Not readable |
| #C9EFFF text on black | 17.27:1 | AAA | Lc -93.5 | Preferred for body text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 100.
-
Step 50
50
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100 (this color)
#C9EFFF
oklch(93% 0.045 225.2)
-
Step 200
200
#C4DEE9
oklch(88.5% 0.032 225.1)
-
Step 300
300
#99C9DD
oklch(80.9% 0.058 225.4)
-
Step 400
400
#5AADCC
oklch(70.7% 0.092 224.9)
-
Step 500
500
#0997BF
oklch(63% 0.118 225.4)
-
Step 600
600
#007FA2
oklch(55.5% 0.106 225.7)
-
Step 700
700
#006B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#00495E
oklch(37.7% 0.071 225)
-
Step 950
950
#032B38
oklch(27% 0.048 224.9)
#C9EFFF with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #E6EDFF | 0.036 |
| Deuteranopia (no green cones) | #DEE6FF | 0.033 |
| Tritanopia (no blue cones) | #BAF4F4 | 0.029 |
| Achromatopsia (no color) | #E9E9E9 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C9EFFF
#C9EFFF
oklch(93% 0.045 225.2)
- #FFE1D3
#FFE1D3
oklch(93.1% 0.038 46.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #C9EFFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Diamond #B9F2FF ΔE 0.019
- Pale Sky Blue #BDF6FE ΔE 0.022
- Lavender #E6E6FA ΔE 0.040
- Duck Egg Blue #C3FBF4 ΔE 0.040
- Pale Turquoise #AFEEEE ΔE 0.040
- Pale Blue #D0FEFE ΔE 0.042
- Light Light Blue #CAFFFB ΔE 0.045
- Really Light Blue #D4FFFF ΔE 0.046
Use #C9EFFF in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.