#51A871
Closest named color: Algae (#54AC68). oklch(66.3% 0.118 153.9), rgb(81, 168, 113).
Aa
Black text reads best on this color (7.18:1).
About this color
#51A871 is a medium-light, moderately saturated green. In OKLCH its lightness is 66%, its chroma 0.118 and its hue 154°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae (#54AC68), ΔE 0.019 away. Black text reads best on it, at 7.18:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.118) |
| Temperature | in between |
| Nearest name | Algae (#54AC68) |
| Black text | 7.18:1 |
| White text | 2.92:1 |
Values
| HEX | #51A871 |
| RGB | rgb(81, 168, 113) |
| HSL | hsl(142, 35%, 49%) |
| OKLCH | oklch(66.3% 0.118 153.9) |
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 #51A871 | 2.92:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #51A871 | 7.18:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #51A871 text on white | 2.92:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #51A871 text on black | 7.18:1 | AAA | Lc -46.4 | Large or bold text, headings |
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 500.
-
Step 50
50
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E2EDE5
oklch(93.6% 0.016 154.5)
-
Step 200
200
#CAE0D0
oklch(88.6% 0.032 154.1)
-
Step 300
300
#A4CCB0
oklch(80.9% 0.058 154.4)
-
Step 400
400
#71B286
oklch(70.8% 0.093 153.8)
-
Step 500
500 (this color)
#51A871
oklch(66.3% 0.118 153.9)
-
Step 600
600
#1F884F
oklch(55.5% 0.128 154.1)
-
Step 700
700
#0D7440
oklch(49.2% 0.12 154)
-
Step 800
800
#125E35
oklch(42.7% 0.098 154.2)
-
Step 900
900
#194D2E
oklch(37.6% 0.077 154)
-
Step 950
950
#102D1B
oklch(26.9% 0.049 154.2)
#51A871 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) | #A89C6E | 0.105 |
| Deuteranopia (no green cones) | #9B9474 | 0.101 |
| Tritanopia (no blue cones) | #3BA69A | 0.061 |
| Achromatopsia (no color) | #979797 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A871
#51A871
oklch(66.3% 0.118 153.9)
- #BE76B1
#BE76B1
oklch(66.2% 0.118 333.6)
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 #51A871, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae #54AC68 ΔE 0.019
- Dark Seafoam Green #3EAF76 ΔE 0.021
- Seaweed Green #35AD6B ΔE 0.026
- Tea #65AB7C ΔE 0.027
- Jade #1FA774 ΔE 0.029
- Bluey Green #2BB179 ΔE 0.030
- Jade Green #2BAF6A ΔE 0.033
- Medium Sea Green #3CB371 ΔE 0.034
Use #51A871 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.