#63AAF7
Closest named color: Cornflower Blue (#6495ED). oklch(72.4% 0.134 251.9), rgb(99, 170, 247).
Aa
Black text reads best on this color (8.62:1).
About this color
#63AAF7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.134 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.055 away. Black text reads best on it, at 8.62:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.62:1 |
| White text | 2.43:1 |
Values
| HEX | #63AAF7 |
| RGB | rgb(99, 170, 247) |
| HSL | hsl(211, 90%, 68%) |
| OKLCH | oklch(72.4% 0.134 251.9) |
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 #63AAF7 | 2.43:1 | Fails | Lc -52.7 | Large or bold text, headings |
| Black text on #63AAF7 | 8.62:1 | AAA | Lc 56.3 | Large or bold text, headings |
| #63AAF7 text on white | 2.43:1 | Fails | Lc 47.7 | Large or bold text, headings |
| #63AAF7 text on black | 8.62:1 | AAA | Lc -54.3 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#99C5F6
oklch(81% 0.084 251.6)
-
Step 400
400 (this color)
#63AAF7
oklch(72.4% 0.134 251.9)
-
Step 500
500
#258BEC
oklch(63% 0.171 252)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#01427A
oklch(37.7% 0.112 251.9)
-
Step 950
950
#062747
oklch(26.9% 0.07 251.5)
#63AAF7 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) | #89AEFA | 0.043 |
| Deuteranopia (no green cones) | #76A0F5 | 0.030 |
| Tritanopia (no blue cones) | #00BCC5 | 0.111 |
| Achromatopsia (no color) | #A6A6A6 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AAF7
#63AAF7
oklch(72.4% 0.134 251.9)
- #D99637
#D99637
oklch(72.3% 0.134 71.7)
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 #63AAF7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.055
- Carolina Blue #8AB8FE ΔE 0.059
- Deep Sky Blue #00BFFF ΔE 0.062
- Periwinkle Blue #8F99FB ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.064
- Perrywinkle #8F8CE7 ΔE 0.085
- Dark Sky Blue #448EE4 ΔE 0.085
- Vivid Sky Blue #4CC9F0 ΔE 0.088
Use #63AAF7 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.