#63A3DF
Closest named color: Cornflower Blue (#6495ED). oklch(69.7% 0.111 248.2), rgb(99, 163, 223).
Aa
Black text reads best on this color (7.83:1).
About this color
#63A3DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.111 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.048 away. Black text reads best on it, at 7.83:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.83:1 |
| White text | 2.68:1 |
Values
| HEX | #63A3DF |
| RGB | rgb(99, 163, 223) |
| HSL | hsl(209, 66%, 63%) |
| OKLCH | oklch(69.7% 0.111 248.2) |
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 #63A3DF | 2.68:1 | Fails | Lc -57.1 | Large or bold text, headings |
| Black text on #63A3DF | 7.83:1 | AAA | Lc 52.1 | Large or bold text, headings |
| #63A3DF text on white | 2.68:1 | Fails | Lc 51.9 | Large or bold text, headings |
| #63A3DF text on black | 7.83:1 | AAA | Lc -50.0 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9EC5EC
oklch(80.9% 0.069 248.7)
-
Step 400
400 (this color)
#63A3DF
oklch(69.7% 0.111 248.2)
-
Step 500
500
#368EDA
oklch(63% 0.141 248.4)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#0E4470
oklch(37.7% 0.093 248.5)
-
Step 950
950
#0B2841
oklch(26.9% 0.058 248)
#63A3DF 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) | #8AA5E2 | 0.045 |
| Deuteranopia (no green cones) | #7998DE | 0.035 |
| Tritanopia (no blue cones) | #00B1B8 | 0.094 |
| Achromatopsia (no color) | #9E9E9E | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A3DF
#63A3DF
oklch(69.7% 0.111 248.2)
- #CB904C
#CB904C
oklch(69.8% 0.111 68.1)
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 #63A3DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.048
- Chefchaouen Blue #4895EF ΔE 0.057
- Greyblue #77A1B5 ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.070
- Faded Blue #658CBB ΔE 0.073
- Bluegrey #85A3B2 ΔE 0.074
- Periwinkle Blue #8F99FB ΔE 0.074
- Bluey Grey #89A0B0 ΔE 0.076
Use #63A3DF 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.