#51AA28
Closest named color: Grass (#5CAC2D). oklch(65.8% 0.183 138), rgb(81, 170, 40).
Aa
Black text reads best on this color (7.13:1).
About this color
#51AA28 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.183 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.013 away. Black text reads best on it, at 7.13:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.13:1 |
| White text | 2.94:1 |
Values
| HEX | #51AA28 |
| RGB | rgb(81, 170, 40) |
| HSL | hsl(101, 62%, 41%) |
| OKLCH | oklch(65.8% 0.183 138) |
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 #51AA28 | 2.94:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #51AA28 | 7.13:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #51AA28 text on white | 2.94:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #51AA28 text on black | 7.13:1 | AAA | Lc -46.2 | 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
#E2EEDE
oklch(93.6% 0.025 137.8)
-
Step 200
200
#CAE1C2
oklch(88.4% 0.048 137.6)
-
Step 300
300
#A4CF96
oklch(80.9% 0.09 138.1)
-
Step 400
400
#72B559
oklch(70.7% 0.143 137.8)
-
Step 500
500 (this color)
#51AA28
oklch(65.8% 0.183 138)
-
Step 600
600
#368900
oklch(55.6% 0.172 138)
-
Step 700
700
#2D7300
oklch(49.1% 0.151 137.9)
-
Step 800
800
#235E00
oklch(42.6% 0.131 138)
-
Step 900
900
#1C4F00
oklch(37.8% 0.117 138)
-
Step 950
950
#112E05
oklch(26.9% 0.075 138)
#51AA28 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) | #AF9B09 | 0.116 |
| Deuteranopia (no green cones) | #A49436 | 0.118 |
| Tritanopia (no blue cones) | #4AA491 | 0.127 |
| Achromatopsia (no color) | #969696 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA28
#51AA28
oklch(65.8% 0.183 138)
- #BF67D9
#BF67D9
oklch(65.9% 0.184 318.1)
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 #51AA28, closest first.
No curated palette has a color within ΔE 0.04 of #51AA28.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.013
- Leaf Green #5CA904 ΔE 0.013
- Medium Green #39AD48 ΔE 0.025
- Mid Green #50A747 ΔE 0.029
- Kelly Green #02AB2E ΔE 0.033
- Leaf #71AA34 ΔE 0.035
- Leafy Green #51B73B ΔE 0.037
- Shamrock #01B44C ΔE 0.038
Use #51AA28 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.