#21D1FC
Closest named color: Bright Sky Blue (#02CCFE). oklch(79.8% 0.141 220.5), rgb(33, 209, 252).
Aa
Black text reads best on this color (11.59:1).
About this color
#21D1FC is a light, vivid teal or cyan. In OKLCH its lightness is 80%, its chroma 0.141 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Sky Blue (#02CCFE), ΔE 0.016 away. Black text reads best on it, at 11.59:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Bright Sky Blue (#02CCFE) |
| Black text | 11.59:1 |
| White text | 1.81:1 |
Values
| HEX | #21D1FC |
| RGB | rgb(33, 209, 252) |
| HSL | hsl(192, 97%, 56%) |
| OKLCH | oklch(79.8% 0.141 220.5) |
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 #21D1FC | 1.81:1 | Fails | Lc -37.2 | Non-text elements, placeholder text |
| Black text on #21D1FC | 11.59:1 | AAA | Lc 70.7 | Content text, not long reading |
| #21D1FC text on white | 1.81:1 | Fails | Lc 33.2 | Non-text elements, placeholder text |
| #21D1FC text on black | 11.59:1 | AAA | Lc -69.5 | 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
#CDF1FD
oklch(93.6% 0.041 219.9)
-
Step 200
200
#9EE6FD
oklch(88.5% 0.078 219.9)
-
Step 300
300 (this color)
#21D1FC
oklch(79.8% 0.141 220.5)
-
Step 400
400
#00B2D8
oklch(70.7% 0.129 220.4)
-
Step 500
500
#0099BA
oklch(63.2% 0.115 220.3)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#004A5B
oklch(37.8% 0.069 219.8)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#21D1FC 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) | #B7CBFE | 0.116 |
| Deuteranopia (no green cones) | #9CB8FC | 0.103 |
| Tritanopia (no blue cones) | #00DFDF | 0.066 |
| Achromatopsia (no color) | #C0C0C0 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21D1FC
#21D1FC
oklch(79.8% 0.141 220.5)
- #FFA280
#FFA280
oklch(79.8% 0.121 40.8)
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 #21D1FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Sky Blue #02CCFE ΔE 0.016
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Aqua Blue #02D8E9 ΔE 0.039
- Lightblue #7BC8F6 ΔE 0.052
- Deep Sky Blue #00BFFF ΔE 0.053
- Sky #82CAFC ΔE 0.058
- Light Sky Blue #87CEFA ΔE 0.061
- Sky Blue #87CEEB ΔE 0.062
Use #21D1FC 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.