#21CDAA
Closest named color: Emerald (#06D6A0). oklch(75.9% 0.139 173.9), rgb(33, 205, 170).
Aa
Black text reads best on this color (10.37:1).
About this color
#21CDAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.139 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.033 away. Black text reads best on it, at 10.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.37:1 |
| White text | 2.02:1 |
Values
| HEX | #21CDAA |
| RGB | rgb(33, 205, 170) |
| HSL | hsl(168, 72%, 47%) |
| OKLCH | oklch(75.9% 0.139 173.9) |
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 #21CDAA | 2.02:1 | Fails | Lc -43.2 | Non-text elements, placeholder text |
| Black text on #21CDAA | 10.37:1 | AAA | Lc 65.2 | Content text, not long reading |
| #21CDAA text on white | 2.02:1 | Fails | Lc 38.8 | Non-text elements, placeholder text |
| #21CDAA text on black | 10.37:1 | AAA | Lc -63.6 | 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 300.
-
Step 50
50
#EAFAF4
oklch(97.2% 0.019 171.5)
-
Step 100
100
#CFF3E8
oklch(93.5% 0.04 175)
-
Step 200
200
#A3EAD5
oklch(88.4% 0.077 174.1)
-
Step 300
300 (this color)
#21CDAA
oklch(75.9% 0.139 173.9)
-
Step 400
400
#00BB9A
oklch(70.7% 0.134 174)
-
Step 500
500
#00A084
oklch(63% 0.119 174.3)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725D
oklch(49.3% 0.094 174)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#21CDAA 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) | #C6BFA8 | 0.145 |
| Deuteranopia (no green cones) | #B1B0AD | 0.139 |
| Tritanopia (no blue cones) | #00CFC3 | 0.034 |
| Achromatopsia (no color) | #B6B6B6 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CDAA
#21CDAA
oklch(75.9% 0.139 173.9)
- #F489B7
#F489B7
oklch(75.8% 0.14 353.7)
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 #21CDAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.033
- Medium Aquamarine #66CDAA ΔE 0.036
- Greenblue #23C48B ΔE 0.043
- Green Blue #01C08D ΔE 0.049
- Medium Turquoise #48D1CC ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.055
- Topaz #13BBAF ΔE 0.056
- Seafoam Blue #78D1B6 ΔE 0.058
Use #21CDAA 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.