#51E2F3
Closest named color: Robin's Egg (#6DEDFD). oklch(84.3% 0.123 206.2), rgb(81, 226, 243).
Aa
Black text reads best on this color (13.52:1).
About this color
#51E2F3 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.123 and its hue 206°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.038 away. Black text reads best on it, at 13.52:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.52:1 |
| White text | 1.55:1 |
Values
| HEX | #51E2F3 |
| RGB | rgb(81, 226, 243) |
| HSL | hsl(186, 87%, 64%) |
| OKLCH | oklch(84.3% 0.123 206.2) |
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 #51E2F3 | 1.55:1 | Fails | Lc -28.4 | Dividers and decoration only |
| Black text on #51E2F3 | 13.52:1 | AAA | Lc 78.7 | Fine for body text |
| #51E2F3 text on white | 1.55:1 | Fails | Lc 25.0 | Dividers and decoration only |
| #51E2F3 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
#EAF9FB
oklch(97.2% 0.016 206.4)
-
Step 100
100
#D0F1F6
oklch(93.6% 0.035 207.7)
-
Step 200
200
#A3E7F0
oklch(88.6% 0.069 206.3)
-
Step 300
300 (this color)
#51E2F3
oklch(84.3% 0.123 206.2)
-
Step 400
400
#00B5C6
oklch(70.6% 0.121 206.7)
-
Step 500
500
#009BAA
oklch(63% 0.108 206.9)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E78
oklch(49.1% 0.084 205.8)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#004B52
oklch(37.7% 0.064 205.5)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#51E2F3 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) | #D0D9F4 | 0.121 |
| Deuteranopia (no green cones) | #B8C8F3 | 0.110 |
| Tritanopia (no blue cones) | #00EBE7 | 0.040 |
| Achromatopsia (no color) | #CFCFCF | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51E2F3
#51E2F3
oklch(84.3% 0.123 206.2)
- #FFB6AE
#FFB6AE
oklch(84.3% 0.086 26.1)
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 #51E2F3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.038
- Aqua Blue #02D8E9 ΔE 0.040
- Turquoise #40E0D0 ΔE 0.051
- Bright Light Blue #26F7FD ΔE 0.054
- Sky Blue #87CEEB ΔE 0.060
- Robin Egg Blue #8AF1FE ΔE 0.063
- Medium Turquoise #48D1CC ΔE 0.064
- Light Sky Blue #87CEFA ΔE 0.067
Use #51E2F3 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.