#63BCEC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.9% 0.11 234.4), rgb(99, 188, 236).
Aa
Black text reads best on this color (9.93:1).
About this color
#63BCEC is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.110 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.036 away. Black text reads best on it, at 9.93:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.93:1 |
| White text | 2.11:1 |
Values
| HEX | #63BCEC |
| RGB | rgb(99, 188, 236) |
| HSL | hsl(201, 78%, 66%) |
| OKLCH | oklch(75.9% 0.11 234.4) |
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 #63BCEC | 2.11:1 | Fails | Lc -45.8 | Large or bold text, headings |
| Black text on #63BCEC | 9.93:1 | AAA | Lc 62.7 | Content text, not long reading |
| #63BCEC text on white | 2.11:1 | Fails | Lc 41.2 | Non-text elements, placeholder text |
| #63BCEC text on black | 9.93:1 | AAA | Lc -61.0 | 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
#B2E1FC
oklch(88.6% 0.061 233.6)
-
Step 300
300 (this color)
#63BCEC
oklch(75.9% 0.11 234.4)
-
Step 400
400
#00AEEF
oklch(70.8% 0.149 234.4)
-
Step 500
500
#0095CD
oklch(63.1% 0.132 234.2)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#63BCEC 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) | #A5BAEE | 0.070 |
| Deuteranopia (no green cones) | #92ACEB | 0.060 |
| Tritanopia (no blue cones) | #00C9CC | 0.079 |
| Achromatopsia (no color) | #B2B2B2 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BCEC
#63BCEC
oklch(75.9% 0.11 234.4)
- #E79D6B
#E79D6B
oklch(75.8% 0.11 54.3)
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 #63BCEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.044
- Carolina Blue #8AB8FE ΔE 0.050
- Bright Sky Blue #02CCFE ΔE 0.051
- Sky #82CAFC ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.062
- Light Sky Blue #87CEFA ΔE 0.064
Use #63BCEC 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.