#51AA71
Closest named color: Algae (#54AC68). oklch(66.8% 0.121 153.5), rgb(81, 170, 113).
Aa
Black text reads best on this color (7.33:1).
About this color
#51AA71 is a medium-light, moderately saturated green. In OKLCH its lightness is 67%, its chroma 0.121 and its hue 153°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae (#54AC68), ΔE 0.015 away. Black text reads best on it, at 7.33:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Algae (#54AC68) |
| Black text | 7.33:1 |
| White text | 2.86:1 |
Values
| HEX | #51AA71 |
| RGB | rgb(81, 170, 113) |
| HSL | hsl(142, 35%, 49%) |
| OKLCH | oklch(66.8% 0.121 153.5) |
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 #51AA71 | 2.86:1 | Fails | Lc -59.9 | Large or bold text, headings |
| Black text on #51AA71 | 7.33:1 | AAA | Lc 49.5 | Large or bold text, headings |
| #51AA71 text on white | 2.86:1 | Fails | Lc 54.6 | Large or bold text, headings |
| #51AA71 text on black | 7.33:1 | AAA | Lc -47.3 | 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
#C9E0CF
oklch(88.5% 0.034 153.6)
-
Step 300
300
#A4CCAF
oklch(80.8% 0.059 153.5)
-
Step 400
400
#70B285
oklch(70.7% 0.095 153.6)
-
Step 500
500 (this color)
#51AA71
oklch(66.8% 0.121 153.5)
-
Step 600
600
#1C894D
oklch(55.7% 0.132 153.4)
-
Step 700
700
#08743E
oklch(49.1% 0.123 153.5)
-
Step 800
800
#105E33
oklch(42.6% 0.101 153.3)
-
Step 900
900
#184D2D
oklch(37.6% 0.078 153.5)
-
Step 950
950
#102D1B
oklch(26.9% 0.049 154.2)
#51AA71 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) | #AA9E6D | 0.106 |
| Deuteranopia (no green cones) | #9D9575 | 0.104 |
| Tritanopia (no blue cones) | #3AA89B | 0.062 |
| Achromatopsia (no color) | #999999 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA71
#51AA71
oklch(66.8% 0.121 153.5)
- #C177B4
#C177B4
oklch(66.8% 0.122 333.5)
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 #51AA71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae #54AC68 ΔE 0.015
- Dark Seafoam Green #3EAF76 ΔE 0.017
- Seaweed Green #35AD6B ΔE 0.023
- Tea #65AB7C ΔE 0.026
- Bluey Green #2BB179 ΔE 0.026
- Medium Sea Green #3CB371 ΔE 0.028
- Jade Green #2BAF6A ΔE 0.030
- Jade #1FA774 ΔE 0.031
Use #51AA71 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.