#51BEEA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.6% 0.117 228), rgb(81, 190, 234).
Aa
Black text reads best on this color (9.90:1).
About this color
#51BEEA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.117 and its hue 228°. 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 9.90:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.90:1 |
| White text | 2.12:1 |
Values
| HEX | #51BEEA |
| RGB | rgb(81, 190, 234) |
| HSL | hsl(197, 78%, 62%) |
| OKLCH | oklch(75.6% 0.117 228) |
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 #51BEEA | 2.12:1 | Fails | Lc -45.9 | Large or bold text, headings |
| Black text on #51BEEA | 9.90:1 | AAA | Lc 62.7 | Content text, not long reading |
| #51BEEA text on white | 2.12:1 | Fails | Lc 41.3 | Non-text elements, placeholder text |
| #51BEEA text on black | 9.90:1 | AAA | Lc -61.0 | 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 400.
-
Step 50
50
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DCEDF5
oklch(93.6% 0.021 227.5)
-
Step 200
200
#BEDFEF
oklch(88.5% 0.041 228.7)
-
Step 300
300
#8ECBE6
oklch(81% 0.073 227.4)
-
Step 400
400 (this color)
#51BEEA
oklch(75.6% 0.117 228)
-
Step 500
500
#0097C4
oklch(63.2% 0.123 228.1)
-
Step 600
600
#007FA5
oklch(55.7% 0.108 227.8)
-
Step 700
700
#006A8B
oklch(49% 0.096 228.3)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004960
oklch(37.8% 0.073 227.3)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#51BEEA 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) | #A7BBEC | 0.085 |
| Deuteranopia (no green cones) | #92ABE9 | 0.075 |
| Tritanopia (no blue cones) | #00CBCC | 0.071 |
| Achromatopsia (no color) | #B2B2B2 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BEEA
#51BEEA
oklch(75.6% 0.117 228)
- #EC986C
#EC986C
oklch(75.5% 0.117 48)
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 #51BEEA, 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
- Deep Sky Blue #00BFFF ΔE 0.038
- Bright Sky Blue #02CCFE ΔE 0.043
- Lightblue #7BC8F6 ΔE 0.049
- Sky #82CAFC ΔE 0.061
- Carolina Blue #8AB8FE ΔE 0.064
- Sky Blue #87CEEB ΔE 0.068
- Light Sky Blue #87CEFA ΔE 0.070
Use #51BEEA 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.