#21AD73
Closest named color: Seaweed Green (#35AD6B). oklch(66.3% 0.143 159.4), rgb(33, 173, 115).
Aa
Black text reads best on this color (7.28:1).
About this color
#21AD73 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.143 and its hue 159°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed Green (#35AD6B), ΔE 0.012 away. Black text reads best on it, at 7.28:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Seaweed Green (#35AD6B) |
| Black text | 7.28:1 |
| White text | 2.88:1 |
Values
| HEX | #21AD73 |
| RGB | rgb(33, 173, 115) |
| HSL | hsl(155, 68%, 40%) |
| OKLCH | oklch(66.3% 0.143 159.4) |
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 #21AD73 | 2.88:1 | Fails | Lc -59.8 | Large or bold text, headings |
| Black text on #21AD73 | 7.28:1 | AAA | Lc 49.5 | Large or bold text, headings |
| #21AD73 text on white | 2.88:1 | Fails | Lc 54.6 | Large or bold text, headings |
| #21AD73 text on black | 7.28:1 | AAA | Lc -47.3 | 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 500.
-
Step 50
50
#F0F7F3
oklch(97% 0.009 161.4)
-
Step 100
100
#DFEEE5
oklch(93.5% 0.02 159.7)
-
Step 200
200
#C4E1D0
oklch(88.4% 0.038 159.8)
-
Step 300
300
#9ACFB1
oklch(80.9% 0.07 159.6)
-
Step 400
400
#5BB688
oklch(70.7% 0.112 159.6)
-
Step 500
500 (this color)
#21AD73
oklch(66.3% 0.143 159.4)
-
Step 600
600
#008958
oklch(55.6% 0.127 159.5)
-
Step 700
700
#007349
oklch(49% 0.112 159.4)
-
Step 800
800
#005F3B
oklch(42.8% 0.098 159.1)
-
Step 900
900
#004F31
oklch(37.7% 0.086 159.7)
-
Step 950
950
#032F1C
oklch(27% 0.059 159.5)
#21AD73 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) | #AB9F6F | 0.134 |
| Deuteranopia (no green cones) | #9B9377 | 0.131 |
| Tritanopia (no blue cones) | #00AC9E | 0.062 |
| Achromatopsia (no color) | #989898 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21AD73
#21AD73
oklch(66.3% 0.143 159.4)
- #CB6DAF
#CB6DAF
oklch(66.3% 0.143 339.5)
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 #21AD73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed Green #35AD6B ΔE 0.012
- Bluey Green #2BB179 ΔE 0.014
- Jade Green #2BAF6A ΔE 0.015
- Dark Seafoam Green #3EAF76 ΔE 0.016
- Jade #1FA774 ΔE 0.019
- Green Teal #0CB577 ΔE 0.022
- Dark Seafoam #1FB57A ΔE 0.023
- Medium Sea Green #3CB371 ΔE 0.024
Use #21AD73 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.