#21C0D5
Closest named color: Dark Turquoise (#00CED1). oklch(74.2% 0.123 209.2), rgb(33, 192, 213).
Aa
Black text reads best on this color (9.56:1).
About this color
#21C0D5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.123 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.042 away. Black text reads best on it, at 9.56:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 9.56:1 |
| White text | 2.19:1 |
Values
| HEX | #21C0D5 |
| RGB | rgb(33, 192, 213) |
| HSL | hsl(187, 73%, 48%) |
| OKLCH | oklch(74.2% 0.123 209.2) |
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 #21C0D5 | 2.19:1 | Fails | Lc -47.4 | Large or bold text, headings |
| Black text on #21C0D5 | 9.56:1 | AAA | Lc 61.3 | Content text, not long reading |
| #21C0D5 text on white | 2.19:1 | Fails | Lc 42.7 | Non-text elements, placeholder text |
| #21C0D5 text on black | 9.56:1 | AAA | Lc -59.5 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7F9
oklch(97% 0.01 212.5)
-
Step 100
100
#DAEEF2
oklch(93.6% 0.022 211)
-
Step 200
200
#BAE1E8
oklch(88.4% 0.042 209.7)
-
Step 300
300
#83CFDB
oklch(80.9% 0.077 208.4)
-
Step 400
400 (this color)
#21C0D5
oklch(74.2% 0.123 209.2)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#21C0D5 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) | #AEB8D6 | 0.117 |
| Deuteranopia (no green cones) | #97A8D5 | 0.106 |
| Tritanopia (no blue cones) | #00CAC6 | 0.041 |
| Achromatopsia (no color) | #AFAFAF | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C0D5
#21C0D5
oklch(74.2% 0.123 209.2)
- #EF8C7E
#EF8C7E
oklch(74.2% 0.123 28.9)
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 #21C0D5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.042
- Turquoise Blue #06B1C4 ΔE 0.046
- Vivid Sky Blue #4CC9F0 ΔE 0.050
- Topaz #13BBAF ΔE 0.055
- Medium Turquoise #48D1CC ΔE 0.059
- Bright Sky Blue #02CCFE ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.063
- Aqua Blue #02D8E9 ΔE 0.066
Use #21C0D5 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.