#21DAE2
Closest named color: Aqua Blue (#02D8E9). oklch(80.9% 0.133 199.7), rgb(33, 218, 226).
Aa
Black text reads best on this color (12.19:1).
About this color
#21DAE2 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.133 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.014 away. Black text reads best on it, at 12.19:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.19:1 |
| White text | 1.72:1 |
Values
| HEX | #21DAE2 |
| RGB | rgb(33, 218, 226) |
| HSL | hsl(182, 77%, 51%) |
| OKLCH | oklch(80.9% 0.133 199.7) |
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 #21DAE2 | 1.72:1 | Fails | Lc -34.3 | Non-text elements, placeholder text |
| Black text on #21DAE2 | 12.19:1 | AAA | Lc 73.3 | Content text, not long reading |
| #21DAE2 text on white | 1.72:1 | Fails | Lc 30.5 | Non-text elements, placeholder text |
| #21DAE2 text on black | 12.19:1 | AAA | Lc -72.3 | 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
#E8F9FA
oklch(97% 0.018 201.1)
-
Step 100
100
#CDF2F4
oklch(93.5% 0.038 200.5)
-
Step 200
200
#9EE9EC
oklch(88.6% 0.074 199.1)
-
Step 300
300 (this color)
#21DAE2
oklch(80.9% 0.133 199.7)
-
Step 400
400
#00B7BE
oklch(70.8% 0.12 199.7)
-
Step 500
500
#009DA3
oklch(63.2% 0.108 199.6)
-
Step 600
600
#008489
oklch(55.7% 0.095 199.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5E
oklch(42.8% 0.073 198.7)
-
Step 900
900
#004C4F
oklch(37.8% 0.064 199.4)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#21DAE2 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) | #C9D0E3 | 0.136 |
| Deuteranopia (no green cones) | #B0BDE3 | 0.127 |
| Tritanopia (no blue cones) | #00E2DC | 0.027 |
| Achromatopsia (no color) | #C5C5C5 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21DAE2
#21DAE2
oklch(80.9% 0.133 199.7)
- #FFA4A4
#FFA4A4
oklch(80.9% 0.108 19.7)
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 #21DAE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.014
- Medium Turquoise #48D1CC ΔE 0.033
- Turquoise #40E0D0 ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.038
- Vivid Sky Blue #4CC9F0 ΔE 0.058
- Bright Sky Blue #02CCFE ΔE 0.065
- Seafoam Blue #78D1B6 ΔE 0.067
- Sky Blue #87CEEB ΔE 0.070
Use #21DAE2 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.