#21DCDD
Closest named color: Aqua Blue (#02D8E9). oklch(81.2% 0.134 195.4), rgb(33, 220, 221).
Aa
Black text reads best on this color (12.34:1).
About this color
#21DCDD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.134 and its hue 195°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.024 away. Black text reads best on it, at 12.34:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.34:1 |
| White text | 1.70:1 |
Values
| HEX | #21DCDD |
| RGB | rgb(33, 220, 221) |
| HSL | hsl(180, 74%, 50%) |
| OKLCH | oklch(81.2% 0.134 195.4) |
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 #21DCDD | 1.70:1 | Fails | Lc -33.6 | Non-text elements, placeholder text |
| Black text on #21DCDD | 12.34:1 | AAA | Lc 74.0 | Content text, not long reading |
| #21DCDD text on white | 1.70:1 | Fails | Lc 29.8 | Dividers and decoration only |
| #21DCDD text on black | 12.34:1 | AAA | Lc -73.0 | 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
#E8FAF9
oklch(97.2% 0.019 192.8)
-
Step 100
100
#CDF3F2
oklch(93.7% 0.039 194.5)
-
Step 200
200
#9DE9E9
oklch(88.5% 0.075 195.9)
-
Step 300
300 (this color)
#21DCDD
oklch(81.2% 0.134 195.4)
-
Step 400
400
#00B7B8
oklch(70.6% 0.12 195.5)
-
Step 500
500
#009D9E
oklch(63.1% 0.108 195.6)
-
Step 600
600
#008485
oklch(55.6% 0.095 195.7)
-
Step 700
700
#006F70
oklch(49.1% 0.084 195.9)
-
Step 800
800
#005B5C
oklch(42.7% 0.073 196.1)
-
Step 900
900
#004C4C
oklch(37.7% 0.064 194.8)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#21DCDD 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) | #CDD1DD | 0.140 |
| Deuteranopia (no green cones) | #B4BFDE | 0.130 |
| Tritanopia (no blue cones) | #00E3DC | 0.020 |
| Achromatopsia (no color) | #C6C6C6 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21DCDD
#21DCDD
oklch(81.2% 0.134 195.4)
- #FFA5AB
#FFA5AB
oklch(81.3% 0.107 15.4)
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 #21DCDD, closest first.
No curated palette has a color within ΔE 0.04 of #21DCDD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.024
- Turquoise #40E0D0 ΔE 0.026
- Medium Turquoise #48D1CC ΔE 0.032
- Dark Turquoise #00CED1 ΔE 0.041
- Seafoam Blue #78D1B6 ΔE 0.062
- Aqua Marine #2EE8BB ΔE 0.067
- Vivid Sky Blue #4CC9F0 ΔE 0.068
- Medium Aquamarine #66CDAA ΔE 0.071
Use #21DCDD 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.