#21C8CD
Closest named color: Dark Turquoise (#00CED1). oklch(75.8% 0.124 198.2), rgb(33, 200, 205).
Aa
Black text reads best on this color (10.20:1).
About this color
#21C8CD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.124 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.016 away. Black text reads best on it, at 10.20:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.20:1 |
| White text | 2.05:1 |
Values
| HEX | #21C8CD |
| RGB | rgb(33, 200, 205) |
| HSL | hsl(182, 72%, 47%) |
| OKLCH | oklch(75.8% 0.124 198.2) |
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 #21C8CD | 2.05:1 | Fails | Lc -44.1 | Non-text elements, placeholder text |
| Black text on #21C8CD | 10.20:1 | AAA | Lc 64.3 | Content text, not long reading |
| #21C8CD text on white | 2.05:1 | Fails | Lc 39.6 | Non-text elements, placeholder text |
| #21C8CD text on black | 10.20:1 | AAA | Lc -62.7 | 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
#E9F9F9
oklch(97% 0.017 196.9)
-
Step 100
100
#CFF2F3
oklch(93.6% 0.036 198.7)
-
Step 200
200
#A3E8EA
oklch(88.6% 0.069 198.3)
-
Step 300
300 (this color)
#21C8CD
oklch(75.8% 0.124 198.2)
-
Step 400
400
#00B7BC
oklch(70.8% 0.12 198.3)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008487
oklch(55.6% 0.095 197.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#21C8CD 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) | #B9BECE | 0.128 |
| Deuteranopia (no green cones) | #A2AECE | 0.118 |
| Tritanopia (no blue cones) | #00CFC9 | 0.023 |
| Achromatopsia (no color) | #B5B5B5 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C8CD
#21C8CD
oklch(75.8% 0.124 198.2)
- #F58F92
#F58F92
oklch(75.9% 0.124 18.5)
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 #21C8CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.016
- Medium Turquoise #48D1CC ΔE 0.033
- Topaz #13BBAF ΔE 0.051
- Aqua Blue #02D8E9 ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Medium Aquamarine #66CDAA ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.066
- Seafoam Blue #78D1B6 ΔE 0.069
Use #21C8CD 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.