#51E1FC
Closest named color: Robin's Egg (#6DEDFD). oklch(84.4% 0.126 212.6), rgb(81, 225, 252).
Aa
Black text reads best on this color (13.52:1).
About this color
#51E1FC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.126 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.040 away. Black text reads best on it, at 13.52:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.52:1 |
| White text | 1.55:1 |
Values
| HEX | #51E1FC |
| RGB | rgb(81, 225, 252) |
| HSL | hsl(189, 97%, 65%) |
| OKLCH | oklch(84.4% 0.126 212.6) |
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 #51E1FC | 1.55:1 | Fails | Lc -28.3 | Dividers and decoration only |
| Black text on #51E1FC | 13.52:1 | AAA | Lc 78.7 | Fine for body text |
| #51E1FC text on white | 1.55:1 | Fails | Lc 25.0 | Dividers and decoration only |
| #51E1FC text on black | 13.52:1 | AAA | Lc -78.1 | 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
#E9F9FC
oklch(97.1% 0.017 210.2)
-
Step 100
100
#CFF1F8
oklch(93.6% 0.037 211.5)
-
Step 200
200
#A3E6F4
oklch(88.5% 0.07 212.1)
-
Step 300
300 (this color)
#51E1FC
oklch(84.4% 0.126 212.6)
-
Step 400
400
#00B4CE
oklch(70.7% 0.124 212.8)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7D
oklch(49.1% 0.086 212.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#51E1FC 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) | #CCDAFE | 0.115 |
| Deuteranopia (no green cones) | #B4C8FC | 0.104 |
| Tritanopia (no blue cones) | #00ECE9 | 0.051 |
| Achromatopsia (no color) | #CFCFCF | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51E1FC
#51E1FC
oklch(84.4% 0.126 212.6)
- #FFB8A8
#FFB8A8
oklch(84.5% 0.086 33.1)
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 #51E1FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.040
- Aqua Blue #02D8E9 ΔE 0.044
- Sky Blue #87CEEB ΔE 0.057
- Bright Light Blue #26F7FD ΔE 0.060
- Light Sky Blue #87CEFA ΔE 0.060
- Robin Egg Blue #8AF1FE ΔE 0.064
- Turquoise #40E0D0 ΔE 0.065
- Vivid Sky Blue #4CC9F0 ΔE 0.065
Use #51E1FC 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.