#00D9EF
Closest named color: Aqua Blue (#02D8E9). oklch(81% 0.139 207.7), rgb(0, 217, 239).
Aa
Black text reads best on this color (12.17:1).
About this color
#00D9EF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.139 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.008 away. Black text reads best on it, at 12.17:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.17:1 |
| White text | 1.72:1 |
Values
| HEX | #00D9EF |
| RGB | rgb(0, 217, 239) |
| HSL | hsl(186, 100%, 47%) |
| OKLCH | oklch(81% 0.139 207.7) |
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 #00D9EF | 1.72:1 | Fails | Lc -34.3 | Non-text elements, placeholder text |
| Black text on #00D9EF | 12.17:1 | AAA | Lc 73.4 | Content text, not long reading |
| #00D9EF text on white | 1.72:1 | Fails | Lc 30.4 | Non-text elements, placeholder text |
| #00D9EF text on black | 12.17:1 | AAA | Lc -72.3 | Content text, not long reading |
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 300.
-
Step 50
50
#E8F9FC
oklch(97% 0.018 209.4)
-
Step 100
100
#CCF2F8
oklch(93.6% 0.04 208.1)
-
Step 200
200
#9BE8F4
oklch(88.5% 0.077 208.2)
-
Step 300
300 (this color)
#00D9EF
oklch(81% 0.139 207.7)
-
Step 400
400
#00B5C8
oklch(70.7% 0.122 208)
-
Step 500
500
#009BAB
oklch(63% 0.108 207.7)
-
Step 600
600
#008290
oklch(55.5% 0.095 208)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#00D9EF 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) | #C4D0F0 | 0.133 |
| Deuteranopia (no green cones) | #AABDEF | 0.122 |
| Tritanopia (no blue cones) | #00E4E0 | 0.043 |
| Achromatopsia (no color) | #C5C5C5 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00D9EF
#00D9EF
oklch(81% 0.139 207.7)
- #FFA69A
#FFA69A
oklch(81% 0.108 28)
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 #00D9EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.008
- Dark Turquoise #00CED1 ΔE 0.046
- Vivid Sky Blue #4CC9F0 ΔE 0.046
- Bright Sky Blue #02CCFE ΔE 0.048
- Medium Turquoise #48D1CC ΔE 0.048
- Turquoise #40E0D0 ΔE 0.055
- Sky Blue #87CEEB ΔE 0.066
- Lightblue #7BC8F6 ΔE 0.070
Use #00D9EF 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.