#51AA38
Closest named color: Grass (#5CAC2D). oklch(65.9% 0.173 139.5), rgb(81, 170, 56).
Aa
Black text reads best on this color (7.15:1).
About this color
#51AA38 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.173 and its hue 140°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.014 away. Black text reads best on it, at 7.15:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.173) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.15:1 |
| White text | 2.93:1 |
Values
| HEX | #51AA38 |
| RGB | rgb(81, 170, 56) |
| HSL | hsl(107, 50%, 44%) |
| OKLCH | oklch(65.9% 0.173 139.5) |
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 #51AA38 | 2.93:1 | Fails | Lc -60.8 | Content text, not long reading |
| Black text on #51AA38 | 7.15:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #51AA38 text on white | 2.93:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #51AA38 text on black | 7.15:1 | AAA | Lc -46.3 | 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
#F2F7F0
oklch(97% 0.011 136.6)
-
Step 100
100
#E2EEDF
oklch(93.6% 0.024 139.4)
-
Step 200
200
#CAE1C4
oklch(88.5% 0.046 139.2)
-
Step 300
300
#A4CE9A
oklch(80.8% 0.084 139.7)
-
Step 400
400
#71B560
oklch(70.7% 0.137 139.6)
-
Step 500
500 (this color)
#51AA38
oklch(65.9% 0.173 139.5)
-
Step 600
600
#2C8A00
oklch(55.6% 0.177 139.5)
-
Step 700
700
#247400
oklch(49.1% 0.156 139.5)
-
Step 800
800
#1C5F00
oklch(42.6% 0.136 139.5)
-
Step 900
900
#1A4F08
oklch(37.7% 0.113 139.6)
-
Step 950
950
#112E09
oklch(26.9% 0.07 139.6)
#51AA38 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) | #AF9B29 | 0.116 |
| Deuteranopia (no green cones) | #A39442 | 0.116 |
| Tritanopia (no blue cones) | #48A493 | 0.118 |
| Achromatopsia (no color) | #979797 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA38
#51AA38
oklch(65.9% 0.173 139.5)
- #BF6AD3
#BF6AD3
oklch(66% 0.173 319.7)
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 #51AA38, closest first.
No curated palette has a color within ΔE 0.04 of #51AA38.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.014
- Medium Green #39AD48 ΔE 0.018
- Mid Green #50A747 ΔE 0.018
- Leaf Green #5CA904 ΔE 0.023
- Leaf #71AA34 ΔE 0.031
- Dark Pastel Green #56AE57 ΔE 0.031
- Fern #63A950 ΔE 0.032
- Shamrock #01B44C ΔE 0.036
Use #51AA38 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.