#04DFF9
Closest named color: Aqua Blue (#02D8E9). oklch(82.8% 0.143 209.7), rgb(4, 223, 249).
Aa
Black text reads best on this color (12.92:1).
About this color
#04DFF9 is a light, vivid teal or cyan. In OKLCH its lightness is 83%, its chroma 0.143 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.026 away. Black text reads best on it, at 12.92:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.92:1 |
| White text | 1.62:1 |
Values
| HEX | #04DFF9 |
| RGB | rgb(4, 223, 249) |
| HSL | hsl(186, 97%, 50%) |
| OKLCH | oklch(82.8% 0.143 209.7) |
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 #04DFF9 | 1.62:1 | Fails | Lc -30.7 | Non-text elements, placeholder text |
| Black text on #04DFF9 | 12.92:1 | AAA | Lc 76.6 | Fine for body text |
| #04DFF9 text on white | 1.62:1 | Fails | Lc 27.2 | Dividers and decoration only |
| #04DFF9 text on black | 12.92:1 | AAA | Lc -75.8 | 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 300.
-
Step 50
50
#E8F9FC
oklch(97% 0.018 209.4)
-
Step 100
100
#CBF2F9
oklch(93.6% 0.041 209.7)
-
Step 200
200
#99E8F6
oklch(88.5% 0.08 209.9)
-
Step 300
300 (this color)
#04DFF9
oklch(82.8% 0.143 209.7)
-
Step 400
400
#00B5CA
oklch(70.8% 0.122 209.4)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#04DFF9 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) | #C9D6FB | 0.135 |
| Deuteranopia (no green cones) | #ADC2F9 | 0.123 |
| Tritanopia (no blue cones) | #00EAE7 | 0.046 |
| Achromatopsia (no color) | #CBCBCB | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04DFF9
#04DFF9
oklch(82.8% 0.143 209.7)
- #FFAFA2
#FFAFA2
oklch(82.7% 0.096 29.5)
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 #04DFF9, closest first.
No curated palette has a color within ΔE 0.04 of #04DFF9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.026
- Bright Sky Blue #02CCFE ΔE 0.056
- Vivid Sky Blue #4CC9F0 ΔE 0.058
- Robin's Egg #6DEDFD ΔE 0.059
- Turquoise #40E0D0 ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.063
- Dark Turquoise #00CED1 ΔE 0.065
- Bright Light Blue #26F7FD ΔE 0.067
Use #04DFF9 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.