#99EFFF
Closest named color: Robin's Egg Blue (#98EFF9). oklch(90.3% 0.086 210.6), rgb(153, 239, 255).
Aa
Black text reads best on this color (16.14:1).
About this color
#99EFFF is a very light, moderately saturated teal or cyan. In OKLCH its lightness is 90%, its chroma 0.086 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg Blue (#98EFF9), ΔE 0.009 away. Black text reads best on it, at 16.14:1.
| Hue family | Teals and cyans |
| Lightness | very light (90%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Robin's Egg Blue (#98EFF9) |
| Black text | 16.14:1 |
| White text | 1.30:1 |
Values
| HEX | #99EFFF |
| RGB | rgb(153, 239, 255) |
| HSL | hsl(189, 100%, 80%) |
| OKLCH | oklch(90.3% 0.086 210.6) |
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 #99EFFF | 1.30:1 | Fails | Lc -17.0 | Dividers and decoration only |
| Black text on #99EFFF | 16.14:1 | AAA | Lc 88.8 | Fine for body text |
| #99EFFF text on white | 1.30:1 | Fails | Lc 14.8 | Not readable |
| #99EFFF text on black | 16.14:1 | AAA | Lc -89.0 | Fine 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 200.
-
Step 50
50
#EBF8FB
oklch(97% 0.014 213.1)
-
Step 100
100
#D3F0F6
oklch(93.6% 0.031 211.5)
-
Step 200
200 (this color)
#99EFFF
oklch(90.3% 0.086 210.6)
-
Step 300
300
#5CD4E8
oklch(80.9% 0.11 210.1)
-
Step 400
400
#00B4CB
oklch(70.6% 0.122 210.8)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005A66
oklch(42.9% 0.074 210.4)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#99EFFF 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) | #E1E9FF | 0.081 |
| Deuteranopia (no green cones) | #D0DCFF | 0.075 |
| Tritanopia (no blue cones) | #6EF7F4 | 0.046 |
| Achromatopsia (no color) | #E2E2E2 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #99EFFF
#99EFFF
oklch(90.3% 0.086 210.6)
- #FFD3CB
#FFD3CB
oklch(90.2% 0.051 30.1)
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 #99EFFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg Blue #98EFF9 ΔE 0.009
- Robin Egg Blue #8AF1FE ΔE 0.014
- Pale Turquoise #AFEEEE ΔE 0.029
- Diamond #B9F2FF ΔE 0.035
- Robin's Egg #6DEDFD ΔE 0.038
- Pale Sky Blue #BDF6FE ΔE 0.044
- Powder Blue #B0E0E6 ΔE 0.046
- Pale Cyan #B7FFFA ΔE 0.057
Use #99EFFF 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.