#21B952
Closest named color: Shamrock (#01B44C). oklch(68.9% 0.188 148.3), rgb(33, 185, 82).
Aa
Black text reads best on this color (8.12:1).
About this color
#21B952 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.188 and its hue 148°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.017 away. Black text reads best on it, at 8.12:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.188) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 8.12:1 |
| White text | 2.58:1 |
Values
| HEX | #21B952 |
| RGB | rgb(33, 185, 82) |
| HSL | hsl(139, 70%, 43%) |
| OKLCH | oklch(68.9% 0.188 148.3) |
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 #21B952 | 2.58:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #21B952 | 8.12:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #21B952 text on white | 2.58:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #21B952 text on black | 8.12:1 | AAA | Lc -52.0 | 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
#EFF9F0
oklch(97.2% 0.016 148.4)
-
Step 100
100
#DBF1DE
oklch(93.7% 0.034 149.3)
-
Step 200
200
#BDE6C2
oklch(88.6% 0.065 148.4)
-
Step 300
300
#8AD696
oklch(81% 0.117 148.3)
-
Step 400
400 (this color)
#21B952
oklch(68.9% 0.188 148.3)
-
Step 500
500
#00A543
oklch(63% 0.181 148.3)
-
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
#006024
oklch(42.7% 0.122 148.4)
-
Step 900
900
#00501D
oklch(37.6% 0.108 148.5)
-
Step 950
950
#00300E
oklch(27% 0.077 148.3)
#21B952 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) | #BBA848 | 0.150 |
| Deuteranopia (no green cones) | #AA9C5A | 0.149 |
| Tritanopia (no blue cones) | #00B5A2 | 0.109 |
| Achromatopsia (no color) | #A1A1A1 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B952
#21B952
oklch(68.9% 0.188 148.3)
- #D76AD4
#D76AD4
oklch(68.9% 0.187 328.4)
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 #21B952, closest first.
No curated palette has a color within ΔE 0.04 of #21B952.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.017
- Cool Green #33B864 ΔE 0.024
- Shamrock Green #02C14D ΔE 0.025
- Leafy Green #51B73B ΔE 0.026
- Medium Green #39AD48 ΔE 0.033
- Algae Green #21C36F ΔE 0.038
- Dark Mint Green #20C073 ΔE 0.038
- Dark Pastel Green #56AE57 ΔE 0.043
Use #21B952 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.