#00C4EB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.8% 0.137 219), rgb(0, 196, 235).
Aa
Black text reads best on this color (10.09:1).
About this color
#00C4EB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.137 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.030 away. Black text reads best on it, at 10.09:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.09:1 |
| White text | 2.08:1 |
Values
| HEX | #00C4EB |
| RGB | rgb(0, 196, 235) |
| HSL | hsl(190, 100%, 46%) |
| OKLCH | oklch(75.8% 0.137 219) |
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 #00C4EB | 2.08:1 | Fails | Lc -44.5 | Non-text elements, placeholder text |
| Black text on #00C4EB | 10.09:1 | AAA | Lc 64.0 | Content text, not long reading |
| #00C4EB text on white | 2.08:1 | Fails | Lc 39.9 | Non-text elements, placeholder text |
| #00C4EB text on black | 10.09:1 | AAA | Lc -62.4 | 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 400.
-
Step 50
50
#EDF7FB
oklch(97% 0.012 223.5)
-
Step 100
100
#D9EEF5
oklch(93.6% 0.024 219.7)
-
Step 200
200
#B7E1EF
oklch(88.4% 0.048 220.1)
-
Step 300
300
#7ECEE6
oklch(80.9% 0.085 219.1)
-
Step 400
400 (this color)
#00C4EB
oklch(75.8% 0.137 219)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00819B
oklch(55.7% 0.1 218.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#00C4EB 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) | #ACBEED | 0.116 |
| Deuteranopia (no green cones) | #92ACEB | 0.102 |
| Tritanopia (no blue cones) | #00D1D0 | 0.062 |
| Achromatopsia (no color) | #B4B4B4 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00C4EB
#00C4EB
oklch(75.8% 0.137 219)
- #F9906D
#F9906D
oklch(75.8% 0.136 39.1)
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 #00C4EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.031
- Deep Sky Blue #00BFFF ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.054
- Aqua Blue #02D8E9 ΔE 0.058
- Lightblue #7BC8F6 ΔE 0.066
- Turquoise Blue #06B1C4 ΔE 0.069
- Medium Turquoise #48D1CC ΔE 0.070
Use #00C4EB 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.