#63A4E3
Closest named color: Cornflower Blue (#6495ED). oklch(70.1% 0.115 249.1), rgb(99, 164, 227).
Aa
Black text reads best on this color (7.94:1).
About this color
#63A4E3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.115 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.047 away. Black text reads best on it, at 7.94:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.94:1 |
| White text | 2.64:1 |
Values
| HEX | #63A4E3 |
| RGB | rgb(99, 164, 227) |
| HSL | hsl(210, 70%, 64%) |
| OKLCH | oklch(70.1% 0.115 249.1) |
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 #63A4E3 | 2.64:1 | Fails | Lc -56.5 | Large or bold text, headings |
| Black text on #63A4E3 | 7.94:1 | AAA | Lc 52.7 | Large or bold text, headings |
| #63A4E3 text on white | 2.64:1 | Fails | Lc 51.3 | Large or bold text, headings |
| #63A4E3 text on black | 7.94:1 | AAA | Lc -50.6 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9DC5EE
oklch(80.9% 0.072 249.4)
-
Step 400
400 (this color)
#63A4E3
oklch(70.1% 0.115 249.1)
-
Step 500
500
#338EDD
oklch(63.1% 0.146 248.8)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#0C4472
oklch(37.8% 0.096 249)
-
Step 950
950
#0A2842
oklch(27% 0.06 248.4)
#63A4E3 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) | #8AA6E6 | 0.044 |
| Deuteranopia (no green cones) | #799AE2 | 0.033 |
| Tritanopia (no blue cones) | #00B3BA | 0.097 |
| Achromatopsia (no color) | #9F9F9F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A4E3
#63A4E3
oklch(70.1% 0.115 249.1)
- #CD9149
#CD9149
oklch(70.2% 0.114 68.9)
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 #63A4E3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.047
- Chefchaouen Blue #4895EF ΔE 0.056
- Greyblue #77A1B5 ΔE 0.068
- Dark Sky Blue #448EE4 ΔE 0.071
- Periwinkle Blue #8F99FB ΔE 0.071
- Deep Sky Blue #00BFFF ΔE 0.078
- Faded Blue #658CBB ΔE 0.078
- Carolina Blue #8AB8FE ΔE 0.078
Use #63A4E3 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.