#51DDA4
Closest named color: Emerald (#06D6A0). oklch(80.7% 0.146 162.7), rgb(81, 221, 164).
Aa
Black text reads best on this color (12.22:1).
About this color
#51DDA4 is a light, vivid green. In OKLCH its lightness is 81%, its chroma 0.146 and its hue 163°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.034 away. Black text reads best on it, at 12.22:1.
| Hue family | Greens |
| Lightness | light (81%) |
| Chroma | vivid (0.146) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 12.22:1 |
| White text | 1.71:1 |
Values
| HEX | #51DDA4 |
| RGB | rgb(81, 221, 164) |
| HSL | hsl(156, 67%, 59%) |
| OKLCH | oklch(80.7% 0.146 162.7) |
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 #51DDA4 | 1.71:1 | Fails | Lc -34.4 | Non-text elements, placeholder text |
| Black text on #51DDA4 | 12.22:1 | AAA | Lc 73.3 | Content text, not long reading |
| #51DDA4 text on white | 1.71:1 | Fails | Lc 30.6 | Non-text elements, placeholder text |
| #51DDA4 text on black | 12.22:1 | AAA | Lc -72.2 | 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
#EAFAF2
oklch(97.1% 0.02 164.6)
-
Step 100
100
#D2F3E2
oklch(93.6% 0.041 163.2)
-
Step 200
200
#A8EBCA
oklch(88.6% 0.081 162.8)
-
Step 300
300 (this color)
#51DDA4
oklch(80.7% 0.146 162.7)
-
Step 400
400
#00BD84
oklch(70.6% 0.153 162.8)
-
Step 500
500
#00A271
oklch(63% 0.136 163)
-
Step 600
600
#00895E
oklch(55.7% 0.121 162.5)
-
Step 700
700
#00734E
oklch(49.1% 0.107 162.4)
-
Step 800
800
#005E40
oklch(42.6% 0.092 163.1)
-
Step 900
900
#004F34
oklch(37.8% 0.083 162.1)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#51DDA4 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) | #DACEA1 | 0.142 |
| Deuteranopia (no green cones) | #C6C0A8 | 0.137 |
| Tritanopia (no blue cones) | #00DDCD | 0.057 |
| Achromatopsia (no color) | #C5C5C5 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51DDA4
#51DDA4
oklch(80.7% 0.146 162.7)
- #FF99D9
#FF99D9
oklch(80.7% 0.144 342.6)
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 #51DDA4, closest first.
No curated palette has a color within ΔE 0.04 of #51DDA4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.034
- Aqua Marine #2EE8BB ΔE 0.035
- Aqua Green #12E193 ΔE 0.037
- Medium Aquamarine #66CDAA ΔE 0.049
- Seafoam Blue #78D1B6 ΔE 0.056
- Turquoise #40E0D0 ΔE 0.058
- Weird Green #3AE57F ΔE 0.060
- Seaweed #18D17B ΔE 0.065
Use #51DDA4 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.