#51C8DC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.4% 0.109 210.5), rgb(81, 200, 220).
Aa
Black text reads best on this color (10.64:1).
About this color
#51C8DC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.109 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.029 away. Black text reads best on it, at 10.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.64:1 |
| White text | 1.97:1 |
Values
| HEX | #51C8DC |
| RGB | rgb(81, 200, 220) |
| HSL | hsl(189, 67%, 59%) |
| OKLCH | oklch(77.4% 0.109 210.5) |
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 #51C8DC | 1.97:1 | Fails | Lc -42.2 | Non-text elements, placeholder text |
| Black text on #51C8DC | 10.64:1 | AAA | Lc 66.1 | Content text, not long reading |
| #51C8DC text on white | 1.97:1 | Fails | Lc 37.8 | Non-text elements, placeholder text |
| #51C8DC text on black | 10.64:1 | AAA | Lc -64.6 | 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
#EBF8FB
oklch(97% 0.014 213.1)
-
Step 100
100
#D3F0F6
oklch(93.6% 0.031 211.5)
-
Step 200
200
#ABE5EF
oklch(88.6% 0.06 209.3)
-
Step 300
300 (this color)
#51C8DC
oklch(77.4% 0.109 210.5)
-
Step 400
400
#00B4CB
oklch(70.6% 0.122 210.8)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005A66
oklch(42.9% 0.074 210.4)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#51C8DC 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) | #B7C1DD | 0.102 |
| Deuteranopia (no green cones) | #A3B2DC | 0.094 |
| Tritanopia (no blue cones) | #00D1CE | 0.044 |
| Achromatopsia (no color) | #B9B9B9 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C8DC
#51C8DC
oklch(77.4% 0.109 210.5)
- #F39B8B
#F39B8B
oklch(77.4% 0.109 30.9)
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 #51C8DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.029
- Dark Turquoise #00CED1 ΔE 0.037
- Medium Turquoise #48D1CC ΔE 0.040
- Aqua Blue #02D8E9 ΔE 0.044
- Bright Sky Blue #02CCFE ΔE 0.050
- Lightblue #7BC8F6 ΔE 0.054
- Sky Blue #87CEEB ΔE 0.055
- Light Cornflower Blue #98C1D9 ΔE 0.064
Use #51C8DC 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.