#63B3FB
Closest named color: Carolina Blue (#8AB8FE). oklch(74.6% 0.131 247.7), rgb(99, 179, 251).
Aa
Black text reads best on this color (9.37:1).
About this color
#63B3FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.131 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.043 away. Black text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.37:1 |
| White text | 2.24:1 |
Values
| HEX | #63B3FB |
| RGB | rgb(99, 179, 251) |
| HSL | hsl(208, 95%, 69%) |
| OKLCH | oklch(74.6% 0.131 247.7) |
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 #63B3FB | 2.24:1 | Fails | Lc -48.7 | Large or bold text, headings |
| Black text on #63B3FB | 9.37:1 | AAA | Lc 60.0 | Content text, not long reading |
| #63B3FB text on white | 2.24:1 | Fails | Lc 43.9 | Non-text elements, placeholder text |
| #63B3FB text on black | 9.37:1 | AAA | Lc -58.2 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C2DDF6
oklch(88.6% 0.045 246.3)
-
Step 300
300
#96C6F3
oklch(80.9% 0.082 247.2)
-
Step 400
400 (this color)
#63B3FB
oklch(74.6% 0.131 247.7)
-
Step 500
500
#048EE8
oklch(63.1% 0.167 247.7)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950
#022846
oklch(27% 0.069 247.6)
#63B3FB 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) | #94B5FE | 0.052 |
| Deuteranopia (no green cones) | #7FA6FA | 0.041 |
| Tritanopia (no blue cones) | #00C4CC | 0.104 |
| Achromatopsia (no color) | #ADADAD | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B3FB
#63B3FB
oklch(74.6% 0.131 247.7)
- #E39B47
#E39B47
oklch(74.5% 0.131 67.3)
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 #63B3FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.043
- Deep Sky Blue #00BFFF ΔE 0.046
- Lightblue #7BC8F6 ΔE 0.066
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.071
- Sky #82CAFC ΔE 0.073
- Periwinkle Blue #8F99FB ΔE 0.078
- Pastel Blue #A2BFFE ΔE 0.078
Use #63B3FB 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.