#63A5EC
Closest named color: Cornflower Blue (#6495ED). oklch(70.8% 0.125 251.6), rgb(99, 165, 236).
Aa
Black text reads best on this color (8.12:1).
About this color
#63A5EC is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.125 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.044 away. Black text reads best on it, at 8.12:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.12:1 |
| White text | 2.58:1 |
Values
| HEX | #63A5EC |
| RGB | rgb(99, 165, 236) |
| HSL | hsl(211, 78%, 66%) |
| OKLCH | oklch(70.8% 0.125 251.6) |
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 #63A5EC | 2.58:1 | Fails | Lc -55.5 | Large or bold text, headings |
| Black text on #63A5EC | 8.12:1 | AAA | Lc 53.7 | Large or bold text, headings |
| #63A5EC text on white | 2.58:1 | Fails | Lc 50.3 | Large or bold text, headings |
| #63A5EC text on black | 8.12:1 | AAA | Lc -51.6 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
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
#9CC5F2
oklch(81% 0.078 251.1)
-
Step 400
400 (this color)
#63A5EC
oklch(70.8% 0.125 251.6)
-
Step 500
500
#308CE6
oklch(63.1% 0.16 251.6)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#094376
oklch(37.8% 0.103 251.1)
-
Step 950
950
#092745
oklch(26.9% 0.066 251.7)
#63A5EC 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) | #87A8EF | 0.041 |
| Deuteranopia (no green cones) | #759BEB | 0.030 |
| Tritanopia (no blue cones) | #00B5BE | 0.104 |
| Achromatopsia (no color) | #A1A1A1 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A5EC
#63A5EC
oklch(70.8% 0.125 251.6)
- #D1933E
#D1933E
oklch(70.9% 0.125 71.6)
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 #63A5EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.054
- Periwinkle Blue #8F99FB ΔE 0.063
- Carolina Blue #8AB8FE ΔE 0.072
- Dark Sky Blue #448EE4 ΔE 0.072
- Deep Sky Blue #00BFFF ΔE 0.073
- Perrywinkle #8F8CE7 ΔE 0.077
- Soft Blue #6488EA ΔE 0.077
Use #63A5EC 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.