#51DAED
Closest named color: Aqua Blue (#02D8E9). oklch(82.2% 0.119 208.1), rgb(81, 218, 237).
Aa
Black text reads best on this color (12.60:1).
About this color
#51DAED is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.119 and its hue 208°. 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 12.60:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.60:1 |
| White text | 1.66:1 |
Values
| HEX | #51DAED |
| RGB | rgb(81, 218, 237) |
| HSL | hsl(187, 81%, 62%) |
| OKLCH | oklch(82.2% 0.119 208.1) |
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 #51DAED | 1.66:1 | Fails | Lc -32.6 | Non-text elements, placeholder text |
| Black text on #51DAED | 12.60:1 | AAA | Lc 74.8 | Content text, not long reading |
| #51DAED text on white | 1.66:1 | Fails | Lc 29.0 | Dividers and decoration only |
| #51DAED text on black | 12.60:1 | AAA | Lc -73.9 | 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
#EAF9FB
oklch(97.2% 0.016 206.4)
-
Step 100
100
#D1F1F6
oklch(93.7% 0.034 208)
-
Step 200
200
#A6E6F0
oklch(88.5% 0.066 208.1)
-
Step 300
300 (this color)
#51DAED
oklch(82.2% 0.119 208.1)
-
Step 400
400
#00B5C8
oklch(70.7% 0.122 208)
-
Step 500
500
#009BAC
oklch(63.1% 0.109 208.4)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#51DAED 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) | #C8D2EE | 0.114 |
| Deuteranopia (no green cones) | #B1C1ED | 0.105 |
| Tritanopia (no blue cones) | #00E3E0 | 0.041 |
| Achromatopsia (no color) | #C8C8C8 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51DAED
#51DAED
oklch(82.2% 0.119 208.1)
- #FFACA1
#FFACA1
oklch(82.2% 0.1 27.7)
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 #51DAED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.026
- Sky Blue #87CEEB ΔE 0.048
- Medium Turquoise #48D1CC ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.050
- Turquoise #40E0D0 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.057
- Light Sky Blue #87CEFA ΔE 0.058
- Robin's Egg #6DEDFD ΔE 0.058
Use #51DAED 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.