#04B4E5
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.7% 0.137 226.2), rgb(4, 180, 229).
Aa
Black text reads best on this color (8.66:1).
About this color
#04B4E5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.137 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.043 away. Black text reads best on it, at 8.66:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.66:1 |
| White text | 2.42:1 |
Values
| HEX | #04B4E5 |
| RGB | rgb(4, 180, 229) |
| HSL | hsl(193, 97%, 46%) |
| OKLCH | oklch(71.7% 0.137 226.2) |
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 #04B4E5 | 2.42:1 | Fails | Lc -52.0 | Large or bold text, headings |
| Black text on #04B4E5 | 8.66:1 | AAA | Lc 56.9 | Large or bold text, headings |
| #04B4E5 text on white | 2.42:1 | Fails | Lc 47.0 | Large or bold text, headings |
| #04B4E5 text on black | 8.66:1 | AAA | Lc -55.0 | Large or bold text, headings |
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
#D9EEF7
oklch(93.6% 0.025 225.3)
-
Step 200
200
#B9E0F2
oklch(88.5% 0.048 227.6)
-
Step 300
300
#82CCEB
oklch(80.8% 0.086 226.5)
-
Step 400
400 (this color)
#04B4E5
oklch(71.7% 0.137 226.2)
-
Step 500
500
#0097C1
oklch(63% 0.121 226.4)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#002B3A
oklch(27% 0.052 227.2)
#04B4E5 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) | #99B0E7 | 0.101 |
| Deuteranopia (no green cones) | #809FE4 | 0.087 |
| Tritanopia (no blue cones) | #00C2C4 | 0.072 |
| Achromatopsia (no color) | #A6A6A6 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04B4E5
#04B4E5
oklch(71.7% 0.137 226.2)
- #E98655
#E98655
oklch(71.8% 0.137 46.1)
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 #04B4E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.043
- Turquoise Blue #06B1C4 ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.069
- Light Sea Green #20B2AA ΔE 0.087
- Dark Turquoise #00CED1 ΔE 0.088
- Greyblue #77A1B5 ΔE 0.089
- Topaz #13BBAF ΔE 0.089
Use #04B4E5 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.