#63A3EB
Closest named color: Cornflower Blue (#6495ED). oklch(70.3% 0.125 252.5), rgb(99, 163, 235).
Aa
Black text reads best on this color (7.96:1).
About this color
#63A3EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.125 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.039 away. Black text reads best on it, at 7.96:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.96:1 |
| White text | 2.63:1 |
Values
| HEX | #63A3EB |
| RGB | rgb(99, 163, 235) |
| HSL | hsl(212, 77%, 65%) |
| OKLCH | oklch(70.3% 0.125 252.5) |
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 #63A3EB | 2.63:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #63A3EB | 7.96:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #63A3EB text on white | 2.63:1 | Fails | Lc 51.2 | Large or bold text, headings |
| #63A3EB text on black | 7.96:1 | AAA | Lc -50.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9DC4F2
oklch(80.8% 0.078 252.9)
-
Step 400
400 (this color)
#63A3EB
oklch(70.3% 0.125 252.5)
-
Step 500
500
#348BE6
oklch(63% 0.16 252.7)
-
Step 600
600
#0073D2
oklch(55.5% 0.17 252.7)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900
#0C4277
oklch(37.7% 0.105 252.7)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#63A3EB 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) | #85A7EE | 0.040 |
| Deuteranopia (no green cones) | #7399EA | 0.029 |
| Tritanopia (no blue cones) | #00B4BD | 0.106 |
| Achromatopsia (no color) | #9F9F9F | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A3EB
#63A3EB
oklch(70.3% 0.125 252.5)
- #CF923A
#CF923A
oklch(70.4% 0.126 72.7)
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 #63A3EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.039
- Chefchaouen Blue #4895EF ΔE 0.049
- Periwinkle Blue #8F99FB ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.067
- Soft Blue #6488EA ΔE 0.072
- Perrywinkle #8F8CE7 ΔE 0.073
- Carolina Blue #8AB8FE ΔE 0.076
- Deep Sky Blue #00BFFF ΔE 0.078
Use #63A3EB 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.