#04C3EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.5% 0.136 219.2), rgb(4, 195, 234).
Aa
Black text reads best on this color (9.99:1).
About this color
#04C3EA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.136 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.032 away. Black text reads best on it, at 9.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.99:1 |
| White text | 2.10:1 |
Values
| HEX | #04C3EA |
| RGB | rgb(4, 195, 234) |
| HSL | hsl(190, 97%, 47%) |
| OKLCH | oklch(75.5% 0.136 219.2) |
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 #04C3EA | 2.10:1 | Fails | Lc -45.0 | Non-text elements, placeholder text |
| Black text on #04C3EA | 9.99:1 | AAA | Lc 63.5 | Content text, not long reading |
| #04C3EA text on white | 2.10:1 | Fails | Lc 40.4 | Non-text elements, placeholder text |
| #04C3EA text on black | 9.99:1 | AAA | Lc -61.9 | 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
#EEF7FB
oklch(97.1% 0.011 226)
-
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)
#04C3EA
oklch(75.5% 0.136 219.2)
-
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)
#04C3EA 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) | #ABBDEC | 0.115 |
| Deuteranopia (no green cones) | #91ABEA | 0.101 |
| Tritanopia (no blue cones) | #00D0CF | 0.062 |
| Achromatopsia (no color) | #B3B3B3 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04C3EA
#04C3EA
oklch(75.5% 0.136 219.2)
- #F88F6C
#F88F6C
oklch(75.5% 0.137 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 #04C3EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.032
- Bright Sky Blue #02CCFE ΔE 0.034
- Deep Sky Blue #00BFFF ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.055
- Aqua Blue #02D8E9 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.066
- Lightblue #7BC8F6 ΔE 0.067
- Medium Turquoise #48D1CC ΔE 0.071
Use #04C3EA 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.