#21B52D
Closest named color: Shamrock (#01B44C). oklch(67.5% 0.21 143.6), rgb(33, 181, 45).
Aa
Black text reads best on this color (7.71:1).
About this color
#21B52D is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.210 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.026 away. Black text reads best on it, at 7.71:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.210) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.71:1 |
| White text | 2.72:1 |
Values
| HEX | #21B52D |
| RGB | rgb(33, 181, 45) |
| HSL | hsl(125, 69%, 42%) |
| OKLCH | oklch(67.5% 0.21 143.6) |
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 #21B52D | 2.72:1 | Fails | Lc -57.3 | Large or bold text, headings |
| Black text on #21B52D | 7.71:1 | AAA | Lc 51.9 | Large or bold text, headings |
| #21B52D text on white | 2.72:1 | Fails | Lc 52.1 | Large or bold text, headings |
| #21B52D text on black | 7.71:1 | AAA | Lc -49.8 | 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
#EFF9EE
oklch(97.2% 0.018 142.8)
-
Step 100
100
#DCF1DA
oklch(93.6% 0.038 142.8)
-
Step 200
200
#BDE6BB
oklch(88.4% 0.072 143.7)
-
Step 300
300
#8BD789
oklch(81% 0.131 143.7)
-
Step 400
400 (this color)
#21B52D
oklch(67.5% 0.21 143.6)
-
Step 500
500
#00A71C
oklch(63.2% 0.207 143.6)
-
Step 600
600
#008C16
oklch(55.5% 0.182 143.6)
-
Step 700
700
#007611
oklch(49.1% 0.161 143.6)
-
Step 800
800
#00610C
oklch(42.7% 0.14 143.6)
-
Step 900
900
#005108
oklch(37.7% 0.124 143.6)
-
Step 950
950
#003103
oklch(27.2% 0.089 143.6)
#21B52D 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) | #B9A310 | 0.151 |
| Deuteranopia (no green cones) | #A9983C | 0.152 |
| Tritanopia (no blue cones) | #00B09B | 0.133 |
| Achromatopsia (no color) | #9D9D9D | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B52D
#21B52D
oklch(67.5% 0.21 143.6)
- #D25FDE
#D25FDE
oklch(67.4% 0.21 323.8)
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 #21B52D, closest first.
No curated palette has a color within ΔE 0.04 of #21B52D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.026
- Leafy Green #51B73B ΔE 0.031
- Kelly Green #02AB2E ΔE 0.031
- Shamrock Green #02C14D ΔE 0.036
- Medium Green #39AD48 ΔE 0.038
- Grass #5CAC2D ΔE 0.041
- Frog Green #58BC08 ΔE 0.041
- Leaf Green #5CA904 ΔE 0.042
Use #21B52D 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.