#63A4E9
Closest named color: Cornflower Blue (#6495ED). oklch(70.4% 0.122 251.2), rgb(99, 164, 233).
Aa
Black text reads best on this color (8.01:1).
About this color
#63A4E9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.122 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.042 away. Black text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.01:1 |
| White text | 2.61:1 |
Values
| HEX | #63A4E9 |
| RGB | rgb(99, 164, 233) |
| HSL | hsl(211, 75%, 65%) |
| OKLCH | oklch(70.4% 0.122 251.2) |
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 #63A4E9 | 2.61:1 | Fails | Lc -56.1 | Large or bold text, headings |
| Black text on #63A4E9 | 8.01:1 | AAA | Lc 53.1 | Large or bold text, headings |
| #63A4E9 text on white | 2.61:1 | Fails | Lc 50.9 | Large or bold text, headings |
| #63A4E9 text on black | 8.01:1 | AAA | Lc -51.0 | 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
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9CC5F1
oklch(81% 0.076 250.6)
-
Step 400
400 (this color)
#63A4E9
oklch(70.4% 0.122 251.2)
-
Step 500
500
#328CE3
oklch(63% 0.156 251.2)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#0B4375
oklch(37.8% 0.101 251)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#63A4E9 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) | #87A7EC | 0.041 |
| Deuteranopia (no green cones) | #769AE8 | 0.031 |
| Tritanopia (no blue cones) | #00B4BC | 0.103 |
| Achromatopsia (no color) | #A0A0A0 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A4E9
#63A4E9
oklch(70.4% 0.122 251.2)
- #CF9240
#CF9240
oklch(70.5% 0.122 71.3)
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 #63A4E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.042
- Chefchaouen Blue #4895EF ΔE 0.053
- Periwinkle Blue #8F99FB ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.070
- Carolina Blue #8AB8FE ΔE 0.075
- Soft Blue #6488EA ΔE 0.075
- Perrywinkle #8F8CE7 ΔE 0.076
- Deep Sky Blue #00BFFF ΔE 0.076
Use #63A4E9 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.