#51E1BB
Closest named color: Aqua Marine (#2EE8BB). oklch(82.3% 0.135 172), rgb(81, 225, 187).
Aa
Black text reads best on this color (12.83:1).
About this color
#51E1BB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.135 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.023 away. Black text reads best on it, at 12.83:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 12.83:1 |
| White text | 1.63:1 |
Values
| HEX | #51E1BB |
| RGB | rgb(81, 225, 187) |
| HSL | hsl(164, 71%, 60%) |
| OKLCH | oklch(82.3% 0.135 172) |
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 #51E1BB | 1.63:1 | Fails | Lc -31.5 | Non-text elements, placeholder text |
| Black text on #51E1BB | 12.83:1 | AAA | Lc 75.9 | Fine for body text |
| #51E1BB text on white | 1.63:1 | Fails | Lc 27.9 | Dividers and decoration only |
| #51E1BB text on black | 12.83:1 | AAA | Lc -75.0 | 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 300.
-
Step 50
50
#EAFAF4
oklch(97.2% 0.019 171.5)
-
Step 100
100
#D1F3E7
oklch(93.6% 0.039 172.1)
-
Step 200
200
#A6EAD3
oklch(88.5% 0.075 171.5)
-
Step 300
300 (this color)
#51E1BB
oklch(82.3% 0.135 172)
-
Step 400
400
#00BC97
oklch(70.8% 0.137 171.9)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E23
oklch(26.8% 0.052 171.9)
#51E1BB 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) | #DAD3B9 | 0.138 |
| Deuteranopia (no green cones) | #C6C4BE | 0.134 |
| Tritanopia (no blue cones) | #00E3D6 | 0.039 |
| Achromatopsia (no color) | #CACACA | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51E1BB
#51E1BB
oklch(82.3% 0.135 172)
- #FFA5CD
#FFA5CD
oklch(82.2% 0.116 351.8)
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 #51E1BB, closest first.
No curated palette has a color within ΔE 0.04 of #51E1BB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.023
- Turquoise #40E0D0 ΔE 0.030
- Seafoam Blue #78D1B6 ΔE 0.047
- Light Teal #90E4C1 ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.053
- Emerald #06D6A0 ΔE 0.053
- Medium Turquoise #48D1CC ΔE 0.059
- Aqua Green #12E193 ΔE 0.062
Use #51E1BB 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.