#51AE37
Closest named color: Grass (#5CAC2D). oklch(67% 0.179 139.6), rgb(81, 174, 55).
Aa
Black text reads best on this color (7.45:1).
About this color
#51AE37 is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.179 and its hue 140°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.010 away. Black text reads best on it, at 7.45:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.179) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.45:1 |
| White text | 2.81:1 |
Values
| HEX | #51AE37 |
| RGB | rgb(81, 174, 55) |
| HSL | hsl(107, 52%, 45%) |
| OKLCH | oklch(67% 0.179 139.6) |
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 #51AE37 | 2.81:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #51AE37 | 7.45:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #51AE37 text on white | 2.81:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #51AE37 text on black | 7.45:1 | AAA | Lc -48.1 | 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 400.
-
Step 50
50
#F0F8EF
oklch(97.1% 0.015 142.2)
-
Step 100
100
#DFF0DB
oklch(93.7% 0.033 139.7)
-
Step 200
200
#C4E4BD
oklch(88.5% 0.063 140)
-
Step 300
300
#9AD28D
oklch(80.8% 0.111 139.8)
-
Step 400
400 (this color)
#51AE37
oklch(67% 0.179 139.6)
-
Step 500
500
#35A400
oklch(63.1% 0.201 139.6)
-
Step 600
600
#2B8A00
oklch(55.6% 0.178 139.6)
-
Step 700
700
#237400
oklch(49% 0.157 139.6)
-
Step 800
800
#1B5F00
oklch(42.6% 0.136 139.6)
-
Step 900
900
#155000
oklch(37.8% 0.121 139.7)
-
Step 950
950
#093000
oklch(27.1% 0.087 139.7)
#51AE37 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) | #B39F26 | 0.120 |
| Deuteranopia (no green cones) | #A79742 | 0.120 |
| Tritanopia (no blue cones) | #48A896 | 0.122 |
| Achromatopsia (no color) | #9A9A9A | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AE37
#51AE37
oklch(67% 0.179 139.6)
- #C36BD9
#C36BD9
oklch(66.9% 0.179 319.3)
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 #51AE37, closest first.
No curated palette has a color within ΔE 0.04 of #51AE37.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.010
- Medium Green #39AD48 ΔE 0.020
- Leaf Green #5CA904 ΔE 0.023
- Leafy Green #51B73B ΔE 0.025
- Mid Green #50A747 ΔE 0.028
- Leaf #71AA34 ΔE 0.031
- Shamrock #01B44C ΔE 0.032
- Dark Pastel Green #56AE57 ΔE 0.032
Use #51AE37 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.