#21CD99
Closest named color: Emerald (#06D6A0). oklch(75.5% 0.151 165.9), rgb(33, 205, 153).
Aa
Black text reads best on this color (10.25:1).
About this color
#21CD99 is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.151 and its hue 166°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.024 away. Black text reads best on it, at 10.25:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.25:1 |
| White text | 2.04:1 |
Values
| HEX | #21CD99 |
| RGB | rgb(33, 205, 153) |
| HSL | hsl(162, 72%, 47%) |
| OKLCH | oklch(75.5% 0.151 165.9) |
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 #21CD99 | 2.04:1 | Fails | Lc -43.8 | Non-text elements, placeholder text |
| Black text on #21CD99 | 10.25:1 | AAA | Lc 64.6 | Content text, not long reading |
| #21CD99 text on white | 2.04:1 | Fails | Lc 39.3 | Non-text elements, placeholder text |
| #21CD99 text on black | 10.25:1 | AAA | Lc -63.0 | 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
#EEF8F3
oklch(97% 0.012 164.8)
-
Step 100
100
#DAF0E6
oklch(93.6% 0.027 166.8)
-
Step 200
200
#B9E5D1
oklch(88.5% 0.053 165.8)
-
Step 300
300
#83D4B3
oklch(80.9% 0.093 166.3)
-
Step 400
400 (this color)
#21CD99
oklch(75.5% 0.151 165.9)
-
Step 500
500
#00A277
oklch(63.2% 0.131 166)
-
Step 600
600
#008863
oklch(55.6% 0.116 165.8)
-
Step 700
700
#007253
oklch(49% 0.101 166.2)
-
Step 800
800
#005E43
oklch(42.7% 0.089 165.5)
-
Step 900
900
#004E38
oklch(37.6% 0.078 166.4)
-
Step 950
950
#002F20
oklch(27.1% 0.056 165.8)
#21CD99 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) | #C8BE96 | 0.149 |
| Deuteranopia (no green cones) | #B4AF9C | 0.145 |
| Tritanopia (no blue cones) | #00CEBF | 0.053 |
| Achromatopsia (no color) | #B5B5B5 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CD99
#21CD99
oklch(75.5% 0.151 165.9)
- #F285C4
#F285C4
oklch(75.4% 0.151 345.6)
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 #21CD99, closest first.
No curated palette has a color within ΔE 0.04 of #21CD99.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.024
- Greenblue #23C48B ΔE 0.027
- Green Blue #01C08D ΔE 0.039
- Seaweed #18D17B ΔE 0.045
- Medium Aquamarine #66CDAA ΔE 0.047
- Dark Mint #48C072 ΔE 0.051
- Soft Green #6FC276 ΔE 0.054
- Dark Mint Green #20C073 ΔE 0.054
Use #21CD99 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.