#21D8AD
Closest named color: Emerald (#06D6A0). oklch(78.8% 0.149 171), rgb(33, 216, 173).
Aa
Black text reads best on this color (11.49:1).
About this color
#21D8AD is a light, vivid teal or cyan. In OKLCH its lightness is 79%, its chroma 0.149 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.019 away. Black text reads best on it, at 11.49:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.49:1 |
| White text | 1.82:1 |
Values
| HEX | #21D8AD |
| RGB | rgb(33, 216, 173) |
| HSL | hsl(166, 73%, 49%) |
| OKLCH | oklch(78.8% 0.149 171) |
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 #21D8AD | 1.82:1 | Fails | Lc -37.7 | Non-text elements, placeholder text |
| Black text on #21D8AD | 11.49:1 | AAA | Lc 70.2 | Content text, not long reading |
| #21D8AD text on white | 1.82:1 | Fails | Lc 33.6 | Non-text elements, placeholder text |
| #21D8AD text on black | 11.49:1 | AAA | Lc -69.0 | 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 300.
-
Step 50
50
#E9FAF4
oklch(97.1% 0.02 172.8)
-
Step 100
100
#CEF4E6
oklch(93.6% 0.044 171)
-
Step 200
200
#A0EBD2
oklch(88.4% 0.082 171.5)
-
Step 300
300 (this color)
#21D8AD
oklch(78.8% 0.149 171)
-
Step 400
400
#00BC95
oklch(70.8% 0.139 170.9)
-
Step 500
500
#00A17F
oklch(63.1% 0.124 170.8)
-
Step 600
600
#00876B
oklch(55.5% 0.108 171.4)
-
Step 700
700
#007259
oklch(49.1% 0.097 170.7)
-
Step 800
800
#005D49
oklch(42.6% 0.083 171.6)
-
Step 900
900
#004E3C
oklch(37.7% 0.074 170.6)
-
Step 950
950
#002F23
oklch(27.2% 0.053 170.5)
#21D8AD 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) | #D1C9AB | 0.152 |
| Deuteranopia (no green cones) | #BCB9B0 | 0.147 |
| Tritanopia (no blue cones) | #00DACC | 0.042 |
| Achromatopsia (no color) | #C0C0C0 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21D8AD
#21D8AD
oklch(78.8% 0.149 171)
- #FF91C5
#FF91C5
oklch(78.8% 0.145 351.2)
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 #21D8AD, closest first.
No curated palette has a color within ΔE 0.04 of #21D8AD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.019
- Medium Aquamarine #66CDAA ΔE 0.041
- Aqua Marine #2EE8BB ΔE 0.045
- Aqua Green #12E193 ΔE 0.050
- Turquoise #40E0D0 ΔE 0.052
- Seafoam Blue #78D1B6 ΔE 0.055
- Medium Turquoise #48D1CC ΔE 0.057
- Greenblue #23C48B ΔE 0.063
Use #21D8AD 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.