#21B756
Closest named color: Shamrock (#01B44C). oklch(68.4% 0.182 149.3), rgb(33, 183, 86).
Aa
Black text reads best on this color (7.97:1).
About this color
#21B756 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.182 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.015 away. Black text reads best on it, at 7.97:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.182) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.97:1 |
| White text | 2.63:1 |
Values
| HEX | #21B756 |
| RGB | rgb(33, 183, 86) |
| HSL | hsl(141, 69%, 42%) |
| OKLCH | oklch(68.4% 0.182 149.3) |
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 #21B756 | 2.63:1 | Fails | Lc -55.9 | Large or bold text, headings |
| Black text on #21B756 | 7.97:1 | AAA | Lc 53.3 | Large or bold text, headings |
| #21B756 text on white | 2.63:1 | Fails | Lc 50.8 | Large or bold text, headings |
| #21B756 text on black | 7.97:1 | AAA | Lc -51.2 | 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 400.
-
Step 50
50
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DBF0DE
oklch(93.5% 0.033 149.5)
-
Step 200
200
#BDE5C3
oklch(88.4% 0.062 149.3)
-
Step 300
300
#8AD598
oklch(80.8% 0.114 149.2)
-
Step 400
400 (this color)
#21B756
oklch(68.4% 0.182 149.3)
-
Step 500
500
#00A548
oklch(63% 0.177 149.3)
-
Step 600
600
#008B3C
oklch(55.6% 0.155 149.4)
-
Step 700
700
#007531
oklch(49.1% 0.138 149.3)
-
Step 800
800
#006027
oklch(42.7% 0.12 149.3)
-
Step 900
900
#00501F
oklch(37.7% 0.106 149.2)
-
Step 950
950
#003010
oklch(27% 0.075 149.4)
#21B756 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) | #B8A64D | 0.147 |
| Deuteranopia (no green cones) | #A89B5D | 0.146 |
| Tritanopia (no blue cones) | #00B3A1 | 0.104 |
| Achromatopsia (no color) | #9F9F9F | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B756
#21B756
oklch(68.4% 0.182 149.3)
- #D56ACF
#D56ACF
oklch(68.5% 0.182 329.5)
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 #21B756, closest first.
No curated palette has a color within ΔE 0.04 of #21B756.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.015
- Cool Green #33B864 ΔE 0.019
- Medium Green #39AD48 ΔE 0.028
- Leafy Green #51B73B ΔE 0.031
- Shamrock Green #02C14D ΔE 0.033
- Dark Pastel Green #56AE57 ΔE 0.037
- Dark Mint Green #20C073 ΔE 0.037
- Jade Green #2BAF6A ΔE 0.039
Use #21B756 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.