#63AFF4
Closest named color: Carolina Blue (#8AB8FE). oklch(73.4% 0.126 247.8), rgb(99, 175, 244).
Aa
Black text reads best on this color (8.96:1).
About this color
#63AFF4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.126 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.051 away. Black text reads best on it, at 8.96:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.96:1 |
| White text | 2.34:1 |
Values
| HEX | #63AFF4 |
| RGB | rgb(99, 175, 244) |
| HSL | hsl(209, 87%, 67%) |
| OKLCH | oklch(73.4% 0.126 247.8) |
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 #63AFF4 | 2.34:1 | Fails | Lc -50.9 | Large or bold text, headings |
| Black text on #63AFF4 | 8.96:1 | AAA | Lc 58.0 | Large or bold text, headings |
| #63AFF4 text on white | 2.34:1 | Fails | Lc 46.0 | Large or bold text, headings |
| #63AFF4 text on black | 8.96:1 | AAA | Lc -56.1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C3DCF5
oklch(88.4% 0.044 248.3)
-
Step 300
300
#98C6F2
oklch(81% 0.079 247.7)
-
Step 400
400 (this color)
#63AFF4
oklch(73.4% 0.126 247.8)
-
Step 500
500
#198EE5
oklch(63.1% 0.162 247.9)
-
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
#042845
oklch(27% 0.067 247.8)
#63AFF4 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) | #91B1F7 | 0.050 |
| Deuteranopia (no green cones) | #7EA3F3 | 0.039 |
| Tritanopia (no blue cones) | #00BFC7 | 0.101 |
| Achromatopsia (no color) | #A9A9A9 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AFF4
#63AFF4
oklch(73.4% 0.126 247.8)
- #DD9848
#DD9848
oklch(73.3% 0.126 67.4)
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 #63AFF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.051
- Deep Sky Blue #00BFFF ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.069
- Vivid Sky Blue #4CC9F0 ΔE 0.073
- Periwinkle Blue #8F99FB ΔE 0.073
- Lightblue #7BC8F6 ΔE 0.075
- Chefchaouen Blue #4895EF ΔE 0.077
- Bright Sky Blue #02CCFE ΔE 0.079
Use #63AFF4 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.