#63A9EF
Closest named color: Cornflower Blue (#6495ED). oklch(71.8% 0.125 249.9), rgb(99, 169, 239).
Aa
Black text reads best on this color (8.45:1).
About this color
#63A9EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.125 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.053 away. Black text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.45:1 |
| White text | 2.48:1 |
Values
| HEX | #63A9EF |
| RGB | rgb(99, 169, 239) |
| HSL | hsl(210, 81%, 66%) |
| OKLCH | oklch(71.8% 0.125 249.9) |
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 #63A9EF | 2.48:1 | Fails | Lc -53.7 | Large or bold text, headings |
| Black text on #63A9EF | 8.45:1 | AAA | Lc 55.4 | Large or bold text, headings |
| #63A9EF text on white | 2.48:1 | Fails | Lc 48.6 | Large or bold text, headings |
| #63A9EF text on black | 8.45:1 | AAA | Lc -53.4 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF5
oklch(88.5% 0.043 249.4)
-
Step 300
300
#9AC5F2
oklch(80.9% 0.079 250)
-
Step 400
400 (this color)
#63A9EF
oklch(71.8% 0.125 249.9)
-
Step 500
500
#288DE5
oklch(63.1% 0.16 249.9)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#034376
oklch(37.7% 0.104 250)
-
Step 950
950
#072845
oklch(27.1% 0.066 249.3)
#63A9EF 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) | #8BACF2 | 0.045 |
| Deuteranopia (no green cones) | #799EEE | 0.034 |
| Tritanopia (no blue cones) | #00B9C2 | 0.102 |
| Achromatopsia (no color) | #A4A4A4 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A9EF
#63A9EF
oklch(71.8% 0.125 249.9)
- #D69542
#D69542
oklch(71.9% 0.125 69.8)
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 #63A9EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.063
- Carolina Blue #8AB8FE ΔE 0.063
- Deep Sky Blue #00BFFF ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.066
- Dark Sky Blue #448EE4 ΔE 0.082
- Greyblue #77A1B5 ΔE 0.083
- Perrywinkle #8F8CE7 ΔE 0.084
Use #63A9EF 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.