#51E8FF
Closest named color: Robin's Egg (#6DEDFD). oklch(86.1% 0.128 209.6), rgb(81, 232, 255).
Aa
Black text reads best on this color (14.33:1).
About this color
#51E8FF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 86%, its chroma 0.128 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.024 away. Black text reads best on it, at 14.33:1.
| Hue family | Teals and cyans |
| Lightness | light (86%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 14.33:1 |
| White text | 1.46:1 |
Values
| HEX | #51E8FF |
| RGB | rgb(81, 232, 255) |
| HSL | hsl(188, 100%, 66%) |
| OKLCH | oklch(86.1% 0.128 209.6) |
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 #51E8FF | 1.46:1 | Fails | Lc -24.6 | Dividers and decoration only |
| Black text on #51E8FF | 14.33:1 | AAA | Lc 82.0 | Fine for body text |
| #51E8FF text on white | 1.46:1 | Fails | Lc 21.7 | Dividers and decoration only |
| #51E8FF text on black | 14.33:1 | AAA | Lc -81.6 | 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 200.
-
Step 50
50
#E5FAFE
oklch(97.1% 0.023 210.4)
-
Step 100
100
#C6F3FB
oklch(93.5% 0.047 209.6)
-
Step 200
200 (this color)
#51E8FF
oklch(86.1% 0.128 209.6)
-
Step 300
300
#00D8F1
oklch(80.8% 0.14 209.5)
-
Step 400
400
#00B5CA
oklch(70.8% 0.122 209.4)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#51E8FF 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) | #D4E0FF | 0.121 |
| Deuteranopia (no green cones) | #BBCDFF | 0.111 |
| Tritanopia (no blue cones) | #00F3EF | 0.047 |
| Achromatopsia (no color) | #D5D5D5 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51E8FF
#51E8FF
oklch(86.1% 0.128 209.6)
- #FFBFB5
#FFBFB5
oklch(86% 0.076 28.8)
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 #51E8FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.024
- Bright Light Blue #26F7FD ΔE 0.043
- Robin Egg Blue #8AF1FE ΔE 0.050
- Aqua Blue #02D8E9 ΔE 0.058
- Bright Cyan #41FDFE ΔE 0.058
- Robin's Egg Blue #98EFF9 ΔE 0.059
- Cyan #00FFFF ΔE 0.063
- Bright Turquoise #0FFEF9 ΔE 0.064
Use #51E8FF 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.