#21D2FA
Closest named color: Bright Sky Blue (#02CCFE). oklch(80% 0.14 218.9), rgb(33, 210, 250).
Aa
Black text reads best on this color (11.66:1).
About this color
#21D2FA is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.140 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Sky Blue (#02CCFE), ΔE 0.020 away. Black text reads best on it, at 11.66:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Bright Sky Blue (#02CCFE) |
| Black text | 11.66:1 |
| White text | 1.80:1 |
Values
| HEX | #21D2FA |
| RGB | rgb(33, 210, 250) |
| HSL | hsl(191, 96%, 55%) |
| OKLCH | oklch(80% 0.14 218.9) |
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 #21D2FA | 1.80:1 | Fails | Lc -36.9 | Non-text elements, placeholder text |
| Black text on #21D2FA | 11.66:1 | AAA | Lc 71.0 | Content text, not long reading |
| #21D2FA text on white | 1.80:1 | Fails | Lc 32.8 | Non-text elements, placeholder text |
| #21D2FA text on black | 11.66:1 | AAA | Lc -69.8 | 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
#E8F9FE
oklch(97.1% 0.019 217.2)
-
Step 100
100
#CDF1FC
oklch(93.6% 0.04 218.2)
-
Step 200
200
#9EE6FC
oklch(88.5% 0.077 219)
-
Step 300
300 (this color)
#21D2FA
oklch(80% 0.14 218.9)
-
Step 400
400
#00B3D6
oklch(70.8% 0.128 218.5)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00819B
oklch(55.7% 0.1 218.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586B
oklch(42.5% 0.077 219.1)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#21D2FA 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) | #B9CCFC | 0.118 |
| Deuteranopia (no green cones) | #9EB9FA | 0.104 |
| Tritanopia (no blue cones) | #00DFDF | 0.061 |
| Achromatopsia (no color) | #C1C1C1 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21D2FA
#21D2FA
oklch(80% 0.14 218.9)
- #FFA284
#FFA284
oklch(79.9% 0.119 38.6)
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 #21D2FA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Sky Blue #02CCFE ΔE 0.020
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Aqua Blue #02D8E9 ΔE 0.034
- Lightblue #7BC8F6 ΔE 0.053
- Deep Sky Blue #00BFFF ΔE 0.057
- Sky #82CAFC ΔE 0.059
- Dark Turquoise #00CED1 ΔE 0.060
- Sky Blue #87CEEB ΔE 0.061
Use #21D2FA 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.