#63B5FF
Closest named color: Carolina Blue (#8AB8FE). oklch(75.2% 0.134 247.8), rgb(99, 181, 255).
Aa
Black text reads best on this color (9.58:1).
About this color
#63B5FF is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.134 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.040 away. Black text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.58:1 |
| White text | 2.19:1 |
Values
| HEX | #63B5FF |
| RGB | rgb(99, 181, 255) |
| HSL | hsl(208, 100%, 69%) |
| OKLCH | oklch(75.2% 0.134 247.8) |
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 #63B5FF | 2.19:1 | Fails | Lc -47.6 | Large or bold text, headings |
| Black text on #63B5FF | 9.58:1 | AAA | Lc 61.1 | Content text, not long reading |
| #63B5FF text on white | 2.19:1 | Fails | Lc 42.9 | Non-text elements, placeholder text |
| #63B5FF text on black | 9.58:1 | AAA | Lc -59.3 | 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
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C2DDF7
oklch(88.6% 0.046 247.3)
-
Step 300
300
#95C6F5
oklch(80.9% 0.084 247.9)
-
Step 400
400 (this color)
#63B5FF
oklch(75.2% 0.134 247.8)
-
Step 500
500
#008EE9
oklch(63.1% 0.169 247.8)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950
#012847
oklch(27% 0.071 247.9)
#63B5FF 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) | #95B8FF | 0.053 |
| Deuteranopia (no green cones) | #80A8FE | 0.041 |
| Tritanopia (no blue cones) | #00C7CF | 0.107 |
| Achromatopsia (no color) | #AFAFAF | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B5FF
#63B5FF
oklch(75.2% 0.134 247.8)
- #E69D45
#E69D45
oklch(75.2% 0.134 68)
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 #63B5FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.040
- Deep Sky Blue #00BFFF ΔE 0.045
- Lightblue #7BC8F6 ΔE 0.063
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.068
- Sky #82CAFC ΔE 0.069
- Pastel Blue #A2BFFE ΔE 0.075
- Periwinkle Blue #8F99FB ΔE 0.080
Use #63B5FF 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.