#63C0EE
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.9% 0.11 232.2), rgb(99, 192, 238).
Aa
Black text reads best on this color (10.30:1).
About this color
#63C0EE is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.110 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.026 away. Black text reads best on it, at 10.30:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.30:1 |
| White text | 2.03:1 |
Values
| HEX | #63C0EE |
| RGB | rgb(99, 192, 238) |
| HSL | hsl(200, 80%, 66%) |
| OKLCH | oklch(76.9% 0.11 232.2) |
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 #63C0EE | 2.03:1 | Fails | Lc -43.9 | Non-text elements, placeholder text |
| Black text on #63C0EE | 10.30:1 | AAA | Lc 64.5 | Content text, not long reading |
| #63C0EE text on white | 2.03:1 | Fails | Lc 39.4 | Non-text elements, placeholder text |
| #63C0EE text on black | 10.30:1 | AAA | Lc -62.9 | 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
#ECF7FE
oklch(97% 0.015 235.4)
-
Step 100
100
#D6EEFC
oklch(93.6% 0.032 233.3)
-
Step 200
200
#B1E1FB
oklch(88.5% 0.061 232)
-
Step 300
300 (this color)
#63C0EE
oklch(76.9% 0.11 232.2)
-
Step 400
400
#00AFEB
oklch(70.8% 0.145 232.1)
-
Step 500
500
#0096CA
oklch(63.2% 0.129 232.1)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A90
oklch(49.2% 0.1 232)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#63C0EE 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) | #A9BEF0 | 0.073 |
| Deuteranopia (no green cones) | #96AFED | 0.064 |
| Tritanopia (no blue cones) | #00CCCF | 0.076 |
| Achromatopsia (no color) | #B6B6B6 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C0EE
#63C0EE
oklch(76.9% 0.11 232.2)
- #EC9F70
#EC9F70
oklch(76.8% 0.111 51.8)
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 #63C0EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Lightblue #7BC8F6 ΔE 0.034
- Bright Sky Blue #02CCFE ΔE 0.044
- Sky #82CAFC ΔE 0.045
- Deep Sky Blue #00BFFF ΔE 0.045
- Carolina Blue #8AB8FE ΔE 0.052
- Light Sky Blue #87CEFA ΔE 0.055
- Sky Blue #87CEEB ΔE 0.055
Use #63C0EE 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.