#04B4CB
Closest named color: Turquoise Blue (#06B1C4). oklch(70.6% 0.122 210.8), rgb(4, 180, 203).
Aa
Black text reads best on this color (8.39:1).
About this color
#04B4CB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.122 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.012 away. Black text reads best on it, at 8.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.39:1 |
| White text | 2.50:1 |
Values
| HEX | #04B4CB |
| RGB | rgb(4, 180, 203) |
| HSL | hsl(187, 96%, 41%) |
| OKLCH | oklch(70.6% 0.122 210.8) |
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 #04B4CB | 2.50:1 | Fails | Lc -53.5 | Large or bold text, headings |
| Black text on #04B4CB | 8.39:1 | AAA | Lc 55.5 | Large or bold text, headings |
| #04B4CB text on white | 2.50:1 | Fails | Lc 48.5 | Large or bold text, headings |
| #04B4CB text on black | 8.39:1 | AAA | Lc -53.5 | 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
#EEF7F9
oklch(97% 0.01 212.5)
-
Step 100
100
#DAEEF2
oklch(93.6% 0.022 211)
-
Step 200
200
#BAE1E9
oklch(88.4% 0.042 211.5)
-
Step 300
300
#84CEDC
oklch(80.8% 0.076 210.8)
-
Step 400
400 (this color)
#04B4CB
oklch(70.6% 0.122 210.8)
-
Step 500
500
#009BAF
oklch(63.2% 0.11 210.8)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#04B4CB 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) | #A1ADCC | 0.113 |
| Deuteranopia (no green cones) | #8B9DCB | 0.103 |
| Tritanopia (no blue cones) | #00BEBB | 0.043 |
| Achromatopsia (no color) | #A4A4A4 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04B4CB
#04B4CB
oklch(70.6% 0.122 210.8)
- #E28271
#E28271
oklch(70.7% 0.122 31)
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 #04B4CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.012
- Light Sea Green #20B2AA ΔE 0.048
- Topaz #13BBAF ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.073
- Greyblue #77A1B5 ΔE 0.075
- Deep Sky Blue #00BFFF ΔE 0.076
- Cadet Blue #5F9EA0 ΔE 0.077
- Greeny Blue #42B395 ΔE 0.079
Use #04B4CB 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.