#21B47D
Closest named color: Dark Seafoam (#1FB57A). oklch(68.4% 0.143 161.6), rgb(33, 180, 125).
Aa
Black text reads best on this color (7.88:1).
About this color
#21B47D is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.143 and its hue 162°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Seafoam (#1FB57A), ΔE 0.006 away. Black text reads best on it, at 7.88:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Dark Seafoam (#1FB57A) |
| Black text | 7.88:1 |
| White text | 2.66:1 |
Values
| HEX | #21B47D |
| RGB | rgb(33, 180, 125) |
| HSL | hsl(158, 69%, 42%) |
| OKLCH | oklch(68.4% 0.143 161.6) |
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 #21B47D | 2.66:1 | Fails | Lc -56.4 | Large or bold text, headings |
| Black text on #21B47D | 7.88:1 | AAA | Lc 52.8 | Large or bold text, headings |
| #21B47D text on white | 2.66:1 | Fails | Lc 51.3 | Large or bold text, headings |
| #21B47D text on black | 7.88:1 | AAA | Lc -50.6 | 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
#EFF8F3
oklch(97.1% 0.012 162.1)
-
Step 100
100
#DCF0E4
oklch(93.7% 0.026 159.6)
-
Step 200
200
#BDE4CF
oklch(88.5% 0.05 161.7)
-
Step 300
300
#8BD3AF
oklch(80.9% 0.089 161.8)
-
Step 400
400 (this color)
#21B47D
oklch(68.4% 0.143 161.6)
-
Step 500
500
#00A36E
oklch(63.2% 0.14 161.4)
-
Step 600
600
#00895C
oklch(55.7% 0.123 161.5)
-
Step 700
700
#00734D
oklch(49.1% 0.108 161.8)
-
Step 800
800
#005E3E
oklch(42.6% 0.094 161.6)
-
Step 900
900
#004F33
oklch(37.8% 0.084 161.3)
-
Step 950
950
#002F1D
oklch(27% 0.059 161.7)
#21B47D 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) | #B1A67A | 0.137 |
| Deuteranopia (no green cones) | #A09A81 | 0.132 |
| Tritanopia (no blue cones) | #00B4A5 | 0.057 |
| Achromatopsia (no color) | #9F9F9F | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B47D
#21B47D
oklch(68.4% 0.143 161.6)
- #D473B3
#D473B3
oklch(68.4% 0.143 341.5)
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 #21B47D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Seafoam #1FB57A ΔE 0.006
- Bluey Green #2BB179 ΔE 0.009
- Green Teal #0CB577 ΔE 0.011
- Dark Seafoam Green #3EAF76 ΔE 0.016
- Medium Sea Green #3CB371 ΔE 0.017
- Jade Green #2BAF6A ΔE 0.024
- Seaweed Green #35AD6B ΔE 0.025
- Algae #54AC68 ΔE 0.034
Use #21B47D 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.