#28D8F0
Closest named color: Aqua Blue (#02D8E9). oklch(81% 0.134 209.6), rgb(40, 216, 240).
Aa
Black text reads best on this color (12.17:1).
About this color
#28D8F0 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.134 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.013 away. Black text reads best on it, at 12.17:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.17:1 |
| White text | 1.72:1 |
Values
| HEX | #28D8F0 |
| RGB | rgb(40, 216, 240) |
| HSL | hsl(187, 87%, 55%) |
| OKLCH | oklch(81% 0.134 209.6) |
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 #28D8F0 | 1.72:1 | Fails | Lc -34.5 | Non-text elements, placeholder text |
| Black text on #28D8F0 | 12.17:1 | AAA | Lc 73.2 | Content text, not long reading |
| #28D8F0 text on white | 1.72:1 | Fails | Lc 30.6 | Non-text elements, placeholder text |
| #28D8F0 text on black | 12.17:1 | AAA | Lc -72.1 | 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 300.
-
Step 50
50
#E9F9FC
oklch(97.1% 0.017 210.2)
-
Step 100
100
#CDF2F8
oklch(93.7% 0.039 208.4)
-
Step 200
200
#9EE7F4
oklch(88.4% 0.074 209.8)
-
Step 300
300 (this color)
#28D8F0
oklch(81% 0.134 209.6)
-
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)
#28D8F0 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) | #C3D0F1 | 0.126 |
| Deuteranopia (no green cones) | #AABDF0 | 0.116 |
| Tritanopia (no blue cones) | #00E3DF | 0.045 |
| Achromatopsia (no color) | #C5C5C5 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28D8F0
#28D8F0
oklch(81% 0.134 209.6)
- #FFA698
#FFA698
oklch(81% 0.108 29.4)
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 #28D8F0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.013
- Vivid Sky Blue #4CC9F0 ΔE 0.042
- Bright Sky Blue #02CCFE ΔE 0.045
- Dark Turquoise #00CED1 ΔE 0.049
- Medium Turquoise #48D1CC ΔE 0.049
- Turquoise #40E0D0 ΔE 0.057
- Sky Blue #87CEEB ΔE 0.060
- Lightblue #7BC8F6 ΔE 0.064
Use #28D8F0 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.