#63BDF6
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.5% 0.119 238.8), rgb(99, 189, 246).
Aa
Black text reads best on this color (10.14:1).
About this color
#63BDF6 is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.119 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.038 away. Black text reads best on it, at 10.14:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.14:1 |
| White text | 2.07:1 |
Values
| HEX | #63BDF6 |
| RGB | rgb(99, 189, 246) |
| HSL | hsl(203, 89%, 68%) |
| OKLCH | oklch(76.5% 0.119 238.8) |
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 #63BDF6 | 2.07:1 | Fails | Lc -44.8 | Non-text elements, placeholder text |
| Black text on #63BDF6 | 10.14:1 | AAA | Lc 63.7 | Content text, not long reading |
| #63BDF6 text on white | 2.07:1 | Fails | Lc 40.2 | Non-text elements, placeholder text |
| #63BDF6 text on black | 10.14:1 | AAA | Lc -62.1 | 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
#ECF7FF
oklch(97% 0.016 239.1)
-
Step 100
100
#D6EEFF
oklch(93.7% 0.034 238.7)
-
Step 200
200
#B3E0FF
oklch(88.5% 0.064 238.5)
-
Step 300
300 (this color)
#63BDF6
oklch(76.5% 0.119 238.8)
-
Step 400
400
#00ACF7
oklch(70.7% 0.158 238.5)
-
Step 500
500
#0093D5
oklch(63.1% 0.142 238.9)
-
Step 600
600
#007CB4
oklch(55.7% 0.125 238.6)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#004769
oklch(37.8% 0.084 238.3)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#63BDF6 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) | #A3BCF9 | 0.067 |
| Deuteranopia (no green cones) | #8FAEF5 | 0.055 |
| Tritanopia (no blue cones) | #00CBD0 | 0.087 |
| Achromatopsia (no color) | #B4B4B4 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BDF6
#63BDF6
oklch(76.5% 0.119 238.8)
- #EB9F62
#EB9F62
oklch(76.5% 0.119 58.4)
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 #63BDF6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.038
- Deep Sky Blue #00BFFF ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.040
- Carolina Blue #8AB8FE ΔE 0.042
- Sky #82CAFC ΔE 0.048
- Bright Sky Blue #02CCFE ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.060
- Sky Blue #87CEEB ΔE 0.066
Use #63BDF6 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.