#21B737
Closest named color: Shamrock (#01B44C). oklch(68.1% 0.206 144.5), rgb(33, 183, 55).
Aa
Black text reads best on this color (7.89:1).
About this color
#21B737 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.206 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.022 away. Black text reads best on it, at 7.89:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.206) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.89:1 |
| White text | 2.66:1 |
Values
| HEX | #21B737 |
| RGB | rgb(33, 183, 55) |
| HSL | hsl(129, 69%, 42%) |
| OKLCH | oklch(68.1% 0.206 144.5) |
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 #21B737 | 2.66:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #21B737 | 7.89:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #21B737 text on white | 2.66:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #21B737 text on black | 7.89:1 | AAA | Lc -50.8 | 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
#DBF1DB
oklch(93.6% 0.037 145.3)
-
Step 200
200
#BDE6BC
oklch(88.5% 0.071 144.3)
-
Step 300
300
#8AD68B
oklch(80.8% 0.129 144.6)
-
Step 400
400 (this color)
#21B737
oklch(68.1% 0.206 144.5)
-
Step 500
500
#00A628
oklch(63% 0.201 144.6)
-
Step 600
600
#008C20
oklch(55.6% 0.177 144.6)
-
Step 700
700
#007619
oklch(49.1% 0.157 144.5)
-
Step 800
800
#006113
oklch(42.8% 0.136 144.5)
-
Step 900
900
#00510E
oklch(37.8% 0.121 144.5)
-
Step 950
950
#003005
oklch(26.9% 0.086 144.4)
#21B737 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) | #BAA524 | 0.151 |
| Deuteranopia (no green cones) | #AA9A44 | 0.151 |
| Tritanopia (no blue cones) | #00B29D | 0.128 |
| Achromatopsia (no color) | #9F9F9F | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B737
#21B737
oklch(68.1% 0.206 144.5)
- #D462DE
#D462DE
oklch(68% 0.206 324.3)
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 #21B737, closest first.
No curated palette has a color within ΔE 0.04 of #21B737.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.022
- Leafy Green #51B73B ΔE 0.027
- Shamrock Green #02C14D ΔE 0.029
- Kelly Green #02AB2E ΔE 0.037
- Medium Green #39AD48 ΔE 0.037
- Frog Green #58BC08 ΔE 0.039
- Grass #5CAC2D ΔE 0.041
- Leaf Green #5CA904 ΔE 0.045
Use #21B737 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.