#63AAFF
Closest named color: Cornflower Blue (#6495ED). oklch(72.8% 0.144 254), rgb(99, 170, 255).
Aa
Black text reads best on this color (8.72:1).
About this color
#63AAFF is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.144 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.057 away. Black text reads best on it, at 8.72:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.72:1 |
| White text | 2.40:1 |
Values
| HEX | #63AAFF |
| RGB | rgb(99, 170, 255) |
| HSL | hsl(213, 100%, 69%) |
| OKLCH | oklch(72.8% 0.144 254) |
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 #63AAFF | 2.40:1 | Fails | Lc -52.2 | Large or bold text, headings |
| Black text on #63AAFF | 8.72:1 | AAA | Lc 56.8 | Large or bold text, headings |
| #63AAFF text on white | 2.40:1 | Fails | Lc 47.2 | Large or bold text, headings |
| #63AAFF text on black | 8.72:1 | AAA | Lc -54.8 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCFA
oklch(88.6% 0.049 253.1)
-
Step 300
300
#98C4FA
oklch(80.9% 0.09 253.9)
-
Step 400
400 (this color)
#63AAFF
oklch(72.8% 0.144 254)
-
Step 500
500
#2389F4
oklch(63.1% 0.183 254)
-
Step 600
600
#0072D7
oklch(55.6% 0.177 254)
-
Step 700
700
#005FB6
oklch(49% 0.157 254.2)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900
#00417F
oklch(37.8% 0.12 253.9)
-
Step 950
950
#06264A
oklch(26.9% 0.076 254.4)
#63AAFF 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) | #86AFFF | 0.040 |
| Deuteranopia (no green cones) | #71A0FD | 0.027 |
| Tritanopia (no blue cones) | #00BEC9 | 0.118 |
| Achromatopsia (no color) | #A7A7A7 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AAFF
#63AAFF
oklch(72.8% 0.144 254)
- #DC9826
#DC9826
oklch(72.9% 0.144 74.3)
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 #63AAFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.057
- Carolina Blue #8AB8FE ΔE 0.059
- Periwinkle Blue #8F99FB ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.064
- Chefchaouen Blue #4895EF ΔE 0.066
- Perrywinkle #8F8CE7 ΔE 0.086
- Dark Sky Blue #448EE4 ΔE 0.088
- Soft Blue #6488EA ΔE 0.089
Use #63AAFF 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.