#63CCEF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(79.6% 0.109 222.6), rgb(99, 204, 239).
Aa
Black text reads best on this color (11.41:1).
About this color
#63CCEF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.109 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.019 away. Black text reads best on it, at 11.41:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.41:1 |
| White text | 1.83:1 |
Values
| HEX | #63CCEF |
| RGB | rgb(99, 204, 239) |
| HSL | hsl(195, 81%, 66%) |
| OKLCH | oklch(79.6% 0.109 222.6) |
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 #63CCEF | 1.83:1 | Fails | Lc -38.4 | Non-text elements, placeholder text |
| Black text on #63CCEF | 11.41:1 | AAA | Lc 69.6 | Content text, not long reading |
| #63CCEF text on white | 1.83:1 | Fails | Lc 34.3 | Non-text elements, placeholder text |
| #63CCEF text on black | 11.41:1 | AAA | Lc -68.3 | 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
#ECF8FD
oklch(97.2% 0.014 224.5)
-
Step 100
100
#D4EFF9
oklch(93.6% 0.031 222.1)
-
Step 200
200
#AEE3F6
oklch(88.5% 0.06 221.9)
-
Step 300
300 (this color)
#63CCEF
oklch(79.6% 0.109 222.6)
-
Step 400
400
#00B2DB
oklch(70.8% 0.131 222.1)
-
Step 500
500
#0098BC
oklch(63% 0.117 222.5)
-
Step 600
600
#00809F
oklch(55.6% 0.103 222.6)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
Step 800
800
#00586E
oklch(42.7% 0.079 222.3)
-
Step 900
900
#00495C
oklch(37.6% 0.07 222.6)
-
Step 950
950
#002B38
oklch(26.8% 0.05 223.6)
#63CCEF 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) | #B8C8F1 | 0.088 |
| Deuteranopia (no green cones) | #A4B8EF | 0.079 |
| Tritanopia (no blue cones) | #00D7D7 | 0.065 |
| Achromatopsia (no color) | #BFBFBF | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63CCEF
#63CCEF
oklch(79.6% 0.109 222.6)
- #F8A584
#F8A584
oklch(79.6% 0.109 42.4)
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 #63CCEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.019
- Lightblue #7BC8F6 ΔE 0.026
- Sky Blue #87CEEB ΔE 0.033
- Sky #82CAFC ΔE 0.035
- Light Sky Blue #87CEFA ΔE 0.038
- Bright Sky Blue #02CCFE ΔE 0.040
- Aqua Blue #02D8E9 ΔE 0.048
- Light Cornflower Blue #98C1D9 ΔE 0.056
Use #63CCEF 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.