#21B24E
Closest named color: Shamrock (#01B44C). oklch(67% 0.183 148.1), rgb(33, 178, 78).
Aa
Black text reads best on this color (7.54:1).
About this color
#21B24E is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.183 and its hue 148°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.009 away. Black text reads best on it, at 7.54:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.54:1 |
| White text | 2.78:1 |
Values
| HEX | #21B24E |
| RGB | rgb(33, 178, 78) |
| HSL | hsl(139, 69%, 41%) |
| OKLCH | oklch(67% 0.183 148.1) |
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 #21B24E | 2.78:1 | Fails | Lc -58.3 | Large or bold text, headings |
| Black text on #21B24E | 7.54:1 | AAA | Lc 50.9 | Large or bold text, headings |
| #21B24E text on white | 2.78:1 | Fails | Lc 53.1 | Large or bold text, headings |
| #21B24E text on black | 7.54:1 | AAA | Lc -48.8 | 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
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DCF0DE
oklch(93.5% 0.032 148.2)
-
Step 200
200
#BEE5C2
oklch(88.5% 0.063 147.8)
-
Step 300
300
#8CD597
oklch(80.9% 0.114 148.2)
-
Step 400
400 (this color)
#21B24E
oklch(67% 0.183 148.1)
-
Step 500
500
#00A542
oklch(63% 0.182 148.1)
-
Step 600
600
#008B37
oklch(55.5% 0.16 148.3)
-
Step 700
700
#00752D
oklch(49.1% 0.141 148.2)
-
Step 800
800
#006023
oklch(42.7% 0.123 148.1)
-
Step 900
900
#00501C
oklch(37.6% 0.109 148.1)
-
Step 950
950
#00300E
oklch(27% 0.077 148.3)
#21B24E 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) | #B4A245 | 0.145 |
| Deuteranopia (no green cones) | #A49756 | 0.143 |
| Tritanopia (no blue cones) | #00AE9C | 0.107 |
| Achromatopsia (no color) | #9B9B9B | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B24E
#21B24E
oklch(67% 0.183 148.1)
- #CF66CD
#CF66CD
oklch(67.1% 0.182 328.1)
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 #21B24E, closest first.
No curated palette has a color within ΔE 0.04 of #21B24E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.009
- Medium Green #39AD48 ΔE 0.015
- Cool Green #33B864 ΔE 0.030
- Kelly Green #02AB2E ΔE 0.034
- Leafy Green #51B73B ΔE 0.035
- Dark Pastel Green #56AE57 ΔE 0.036
- Mid Green #50A747 ΔE 0.036
- Grass #5CAC2D ΔE 0.037
Use #21B24E 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.