#21D2AA
Closest named color: Emerald (#06D6A0). oklch(77.2% 0.145 171.9), rgb(33, 210, 170).
Aa
Black text reads best on this color (10.86:1).
About this color
#21D2AA is a medium-light, vivid teal or cyan. In OKLCH its lightness is 77%, its chroma 0.145 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.021 away. Black text reads best on it, at 10.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.86:1 |
| White text | 1.93:1 |
Values
| HEX | #21D2AA |
| RGB | rgb(33, 210, 170) |
| HSL | hsl(166, 73%, 48%) |
| OKLCH | oklch(77.2% 0.145 171.9) |
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 #21D2AA | 1.93:1 | Fails | Lc -40.8 | Non-text elements, placeholder text |
| Black text on #21D2AA | 10.86:1 | AAA | Lc 67.4 | Content text, not long reading |
| #21D2AA text on white | 1.93:1 | Fails | Lc 36.5 | Non-text elements, placeholder text |
| #21D2AA text on black | 10.86:1 | AAA | Lc -66.0 | 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
#CFF4E7
oklch(93.7% 0.042 172.1)
-
Step 200
200
#A2EBD3
oklch(88.5% 0.08 171.9)
-
Step 300
300 (this color)
#21D2AA
oklch(77.2% 0.145 171.9)
-
Step 400
400
#00BC97
oklch(70.8% 0.137 171.9)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E23
oklch(26.8% 0.052 171.9)
#21D2AA 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) | #CBC3A8 | 0.149 |
| Deuteranopia (no green cones) | #B6B4AD | 0.143 |
| Tritanopia (no blue cones) | #00D4C6 | 0.038 |
| Achromatopsia (no color) | #BABABA | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21D2AA
#21D2AA
oklch(77.2% 0.145 171.9)
- #FA8CBF
#FA8CBF
oklch(77.3% 0.145 351.8)
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 #21D2AA, closest first.
No curated palette has a color within ΔE 0.04 of #21D2AA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.021
- Medium Aquamarine #66CDAA ΔE 0.036
- Greenblue #23C48B ΔE 0.050
- Medium Turquoise #48D1CC ΔE 0.055
- Seafoam Blue #78D1B6 ΔE 0.056
- Green Blue #01C08D ΔE 0.058
- Aqua Green #12E193 ΔE 0.061
- Dark Turquoise #00CED1 ΔE 0.061
Use #21D2AA 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.