#51DCFE
Closest named color: Aqua Blue (#02D8E9). oklch(83.3% 0.126 217.4), rgb(81, 220, 254).
Aa
Black text reads best on this color (13.01:1).
About this color
#51DCFE is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.126 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.042 away. Black text reads best on it, at 13.01:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.01:1 |
| White text | 1.61:1 |
Values
| HEX | #51DCFE |
| RGB | rgb(81, 220, 254) |
| HSL | hsl(192, 99%, 66%) |
| OKLCH | oklch(83.3% 0.126 217.4) |
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 #51DCFE | 1.61:1 | Fails | Lc -30.7 | Non-text elements, placeholder text |
| Black text on #51DCFE | 13.01:1 | AAA | Lc 76.6 | Fine for body text |
| #51DCFE text on white | 1.61:1 | Fails | Lc 27.2 | Dividers and decoration only |
| #51DCFE text on black | 13.01:1 | AAA | Lc -75.8 | Fine for body text |
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
#EAF9FD
oklch(97.2% 0.017 215.5)
-
Step 100
100
#D0F0FA
oklch(93.5% 0.036 218.6)
-
Step 200
200
#A4E5F8
oklch(88.5% 0.07 217.9)
-
Step 300
300 (this color)
#51DCFE
oklch(83.3% 0.126 217.4)
-
Step 400
400
#00B3D4
oklch(70.7% 0.127 217.3)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#51DCFE 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) | #C6D6FF | 0.109 |
| Deuteranopia (no green cones) | #ADC4FE | 0.098 |
| Tritanopia (no blue cones) | #00E8E7 | 0.058 |
| Achromatopsia (no color) | #CCCCCC | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51DCFE
#51DCFE
oklch(83.3% 0.126 217.4)
- #FFB39C
#FFB39C
oklch(83.3% 0.095 37.5)
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 #51DCFE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.042
- Light Sky Blue #87CEFA ΔE 0.050
- Sky Blue #87CEEB ΔE 0.050
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Robin's Egg #6DEDFD ΔE 0.053
- Bright Sky Blue #02CCFE ΔE 0.054
- Lightblue #7BC8F6 ΔE 0.056
- Sky #82CAFC ΔE 0.056
Use #51DCFE 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.