#51C0EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.1% 0.116 226.5), rgb(81, 192, 234).
Aa
Black text reads best on this color (10.07:1).
About this color
#51C0EA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.116 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.024 away. Black text reads best on it, at 10.07:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.07:1 |
| White text | 2.08:1 |
Values
| HEX | #51C0EA |
| RGB | rgb(81, 192, 234) |
| HSL | hsl(196, 78%, 62%) |
| OKLCH | oklch(76.1% 0.116 226.5) |
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 #51C0EA | 2.08:1 | Fails | Lc -45.0 | Large or bold text, headings |
| Black text on #51C0EA | 10.07:1 | AAA | Lc 63.5 | Content text, not long reading |
| #51C0EA text on white | 2.08:1 | Fails | Lc 40.4 | Non-text elements, placeholder text |
| #51C0EA text on black | 10.07:1 | AAA | Lc -61.8 | 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
#EBF8FE
oklch(97.1% 0.016 227)
-
Step 100
100
#D3EFFB
oklch(93.5% 0.034 225.4)
-
Step 200
200
#ACE3FA
oklch(88.6% 0.064 225.6)
-
Step 300
300 (this color)
#51C0EA
oklch(76.1% 0.116 226.5)
-
Step 400
400
#00B0E1
oklch(70.6% 0.136 226.7)
-
Step 500
500
#0097C1
oklch(63% 0.121 226.4)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
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)
#51C0EA 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) | #A9BCEC | 0.087 |
| Deuteranopia (no green cones) | #94ADEA | 0.076 |
| Tritanopia (no blue cones) | #00CCCE | 0.066 |
| Achromatopsia (no color) | #B4B4B4 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C0EA
#51C0EA
oklch(76.1% 0.116 226.5)
- #EE9970
#EE9970
oklch(76% 0.116 46.2)
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 #51C0EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.024
- Deep Sky Blue #00BFFF ΔE 0.039
- Bright Sky Blue #02CCFE ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.046
- Sky #82CAFC ΔE 0.058
- Sky Blue #87CEEB ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.065
- Dark Turquoise #00CED1 ΔE 0.066
Use #51C0EA 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.