#21CC9C
Closest named color: Emerald (#06D6A0). oklch(75.3% 0.148 167.5), rgb(33, 204, 156).
Aa
Black text reads best on this color (10.18:1).
About this color
#21CC9C is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.148 and its hue 168°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.027 away. Black text reads best on it, at 10.18:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.18:1 |
| White text | 2.06:1 |
Values
| HEX | #21CC9C |
| RGB | rgb(33, 204, 156) |
| HSL | hsl(163, 72%, 46%) |
| OKLCH | oklch(75.3% 0.148 167.5) |
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 #21CC9C | 2.06:1 | Fails | Lc -44.2 | Non-text elements, placeholder text |
| Black text on #21CC9C | 10.18:1 | AAA | Lc 64.2 | Content text, not long reading |
| #21CC9C text on white | 2.06:1 | Fails | Lc 39.7 | Non-text elements, placeholder text |
| #21CC9C text on black | 10.18:1 | AAA | Lc -62.6 | Content text, not long reading |
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
#EEF8F4
oklch(97.1% 0.012 170.3)
-
Step 100
100
#DAF0E6
oklch(93.6% 0.027 166.8)
-
Step 200
200
#BAE5D2
oklch(88.6% 0.052 166.5)
-
Step 300
300
#83D4B5
oklch(80.9% 0.092 167.7)
-
Step 400
400 (this color)
#21CC9C
oklch(75.3% 0.148 167.5)
-
Step 500
500
#00A27A
oklch(63.2% 0.129 167.5)
-
Step 600
600
#008866
oklch(55.6% 0.113 167.6)
-
Step 700
700
#007255
oklch(49% 0.1 167.6)
-
Step 800
800
#005E45
oklch(42.8% 0.088 167.1)
-
Step 900
900
#004E39
oklch(37.6% 0.077 167.4)
-
Step 950
950
#002F21
oklch(27.1% 0.055 167.3)
#21CC9C 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) | #C7BD99 | 0.148 |
| Deuteranopia (no green cones) | #B3AF9F | 0.142 |
| Tritanopia (no blue cones) | #00CDBF | 0.049 |
| Achromatopsia (no color) | #B4B4B4 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CC9C
#21CC9C
oklch(75.3% 0.148 167.5)
- #F286C0
#F286C0
oklch(75.4% 0.147 347.8)
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 #21CC9C, closest first.
No curated palette has a color within ΔE 0.04 of #21CC9C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.027
- Greenblue #23C48B ΔE 0.028
- Green Blue #01C08D ΔE 0.037
- Medium Aquamarine #66CDAA ΔE 0.045
- Seaweed #18D17B ΔE 0.050
- Dark Mint #48C072 ΔE 0.053
- Soft Green #6FC276 ΔE 0.056
- Dark Mint Green #20C073 ΔE 0.056
Use #21CC9C 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.