#63A8EB
Closest named color: Cornflower Blue (#6495ED). oklch(71.4% 0.121 249.2), rgb(99, 168, 235).
Aa
Black text reads best on this color (8.33:1).
About this color
#63A8EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.121 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.052 away. Black text reads best on it, at 8.33:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.33:1 |
| White text | 2.52:1 |
Values
| HEX | #63A8EB |
| RGB | rgb(99, 168, 235) |
| HSL | hsl(210, 77%, 65%) |
| OKLCH | oklch(71.4% 0.121 249.2) |
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 #63A8EB | 2.52:1 | Fails | Lc -54.3 | Large or bold text, headings |
| Black text on #63A8EB | 8.33:1 | AAA | Lc 54.8 | Large or bold text, headings |
| #63A8EB text on white | 2.52:1 | Fails | Lc 49.3 | Large or bold text, headings |
| #63A8EB text on black | 8.33:1 | AAA | Lc -52.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9BC5F0
oklch(80.9% 0.076 249.4)
-
Step 400
400 (this color)
#63A8EB
oklch(71.4% 0.121 249.2)
-
Step 500
500
#2B8EE2
oklch(63.2% 0.154 249)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#054374
oklch(37.6% 0.101 249.5)
-
Step 950
950
#082844
oklch(27% 0.064 249)
#63A8EB 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) | #8CAAEE | 0.046 |
| Deuteranopia (no green cones) | #7A9DEA | 0.035 |
| Tritanopia (no blue cones) | #00B8BF | 0.101 |
| Achromatopsia (no color) | #A3A3A3 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A8EB
#63A8EB
oklch(71.4% 0.121 249.2)
- #D39446
#D39446
oklch(71.4% 0.121 69.4)
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 #63A8EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.062
- Carolina Blue #8AB8FE ΔE 0.067
- Deep Sky Blue #00BFFF ΔE 0.067
- Periwinkle Blue #8F99FB ΔE 0.068
- Greyblue #77A1B5 ΔE 0.078
- Dark Sky Blue #448EE4 ΔE 0.079
- Perrywinkle #8F8CE7 ΔE 0.083
Use #63A8EB 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.