#63CFF4
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80.5% 0.112 223.4), rgb(99, 207, 244).
Aa
Black text reads best on this color (11.76:1).
About this color
#63CFF4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.112 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.025 away. Black text reads best on it, at 11.76:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.76:1 |
| White text | 1.78:1 |
Values
| HEX | #63CFF4 |
| RGB | rgb(99, 207, 244) |
| HSL | hsl(195, 87%, 67%) |
| OKLCH | oklch(80.5% 0.112 223.4) |
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 #63CFF4 | 1.78:1 | Fails | Lc -36.7 | Non-text elements, placeholder text |
| Black text on #63CFF4 | 11.76:1 | AAA | Lc 71.1 | Content text, not long reading |
| #63CFF4 text on white | 1.78:1 | Fails | Lc 32.7 | Non-text elements, placeholder text |
| #63CFF4 text on black | 11.76:1 | AAA | Lc -69.9 | 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
#EBF8FD
oklch(97.1% 0.015 222.7)
-
Step 100
100
#D4EFFA
oklch(93.6% 0.032 224.2)
-
Step 200
200
#ADE3F7
oklch(88.5% 0.062 222.7)
-
Step 300
300 (this color)
#63CFF4
oklch(80.5% 0.112 223.4)
-
Step 400
400
#00B1DC
oklch(70.6% 0.132 223.3)
-
Step 500
500
#0098BD
oklch(63.1% 0.118 223.1)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#002B38
oklch(26.8% 0.05 223.6)
#63CFF4 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) | #BACBF6 | 0.089 |
| Deuteranopia (no green cones) | #A5BBF4 | 0.079 |
| Tritanopia (no blue cones) | #00DADB | 0.065 |
| Achromatopsia (no color) | #C2C2C2 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63CFF4
#63CFF4
oklch(80.5% 0.112 223.4)
- #FCA784
#FCA784
oklch(80.4% 0.112 43.1)
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 #63CFF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Lightblue #7BC8F6 ΔE 0.027
- Sky Blue #87CEEB ΔE 0.032
- Sky #82CAFC ΔE 0.033
- Light Sky Blue #87CEFA ΔE 0.033
- Bright Sky Blue #02CCFE ΔE 0.041
- Aqua Blue #02D8E9 ΔE 0.047
- Light Cornflower Blue #98C1D9 ΔE 0.060
Use #63CFF4 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.