#04EFF5
Closest named color: Bright Light Blue (#26F7FD). oklch(86.4% 0.147 198), rgb(4, 239, 245).
Aa
Black text reads best on this color (14.67:1).
About this color
#04EFF5 is a light, vivid teal or cyan. In OKLCH its lightness is 86%, its chroma 0.147 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Light Blue (#26F7FD), ΔE 0.024 away. Black text reads best on it, at 14.67:1.
| Hue family | Teals and cyans |
| Lightness | light (86%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Bright Light Blue (#26F7FD) |
| Black text | 14.67:1 |
| White text | 1.43:1 |
Values
| HEX | #04EFF5 |
| RGB | rgb(4, 239, 245) |
| HSL | hsl(181, 97%, 49%) |
| OKLCH | oklch(86.4% 0.147 198) |
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 #04EFF5 | 1.43:1 | Fails | Lc -22.8 | Dividers and decoration only |
| Black text on #04EFF5 | 14.67:1 | AAA | Lc 83.7 | Fine for body text |
| #04EFF5 text on white | 1.43:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #04EFF5 text on black | 14.67:1 | AAA | Lc -83.5 | 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
#E3FBFC
oklch(97.1% 0.025 199.8)
-
Step 100
100
#C0F6F7
oklch(93.7% 0.055 197.7)
-
Step 200
200 (this color)
#04EFF5
oklch(86.4% 0.147 198)
-
Step 300
300
#00DBE1
oklch(80.9% 0.138 198.3)
-
Step 400
400
#00B7BC
oklch(70.8% 0.12 198.3)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008487
oklch(55.6% 0.095 197.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#04EFF5 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) | #DDE3F6 | 0.151 |
| Deuteranopia (no green cones) | #C1CFF6 | 0.140 |
| Tritanopia (no blue cones) | #00F8F0 | 0.028 |
| Achromatopsia (no color) | #D8D8D8 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04EFF5
#04EFF5
oklch(86.4% 0.147 198)
- #FFC0C0
#FFC0C0
oklch(86.5% 0.073 18.7)
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 #04EFF5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Light Blue #26F7FD ΔE 0.024
- Bright Aqua #0BF9EA ΔE 0.036
- Robin's Egg #6DEDFD ΔE 0.040
- Bright Turquoise #0FFEF9 ΔE 0.041
- Bright Cyan #41FDFE ΔE 0.042
- Cyan #00FFFF ΔE 0.043
- Turquoise #40E0D0 ΔE 0.055
- Aqua Blue #02D8E9 ΔE 0.062
Use #04EFF5 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.