#63AAFB
Closest named color: Cornflower Blue (#6495ED). oklch(72.6% 0.139 253), rgb(99, 170, 251).
Aa
Black text reads best on this color (8.67:1).
About this color
#63AAFB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.139 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.056 away. Black text reads best on it, at 8.67:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.67:1 |
| White text | 2.42:1 |
Values
| HEX | #63AAFB |
| RGB | rgb(99, 170, 251) |
| HSL | hsl(212, 95%, 69%) |
| OKLCH | oklch(72.6% 0.139 253) |
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 #63AAFB | 2.42:1 | Fails | Lc -52.4 | Large or bold text, headings |
| Black text on #63AAFB | 8.67:1 | AAA | Lc 56.5 | Large or bold text, headings |
| #63AAFB text on white | 2.42:1 | Fails | Lc 47.4 | Large or bold text, headings |
| #63AAFB text on black | 8.67:1 | AAA | Lc -54.6 | 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
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#99C4F8
oklch(80.8% 0.087 253.5)
-
Step 400
400 (this color)
#63AAFB
oklch(72.6% 0.139 253)
-
Step 500
500
#248AF0
oklch(63% 0.177 253)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#01417C
oklch(37.6% 0.116 253.1)
-
Step 950
950
#062749
oklch(27.1% 0.073 252.8)
#63AAFB 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) | #88AFFE | 0.043 |
| Deuteranopia (no green cones) | #73A0F9 | 0.028 |
| Tritanopia (no blue cones) | #00BDC7 | 0.115 |
| Achromatopsia (no color) | #A6A6A6 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AAFB
#63AAFB
oklch(72.6% 0.139 253)
- #DB972F
#DB972F
oklch(72.7% 0.139 72.8)
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 #63AAFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.056
- Carolina Blue #8AB8FE ΔE 0.059
- Periwinkle Blue #8F99FB ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.085
- Dark Sky Blue #448EE4 ΔE 0.086
- Soft Blue #6488EA ΔE 0.089
Use #63AAFB 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.