#63AFFF
Closest named color: Carolina Blue (#8AB8FE). oklch(73.9% 0.139 251.3), rgb(99, 175, 255).
Aa
Black text reads best on this color (9.10:1).
About this color
#63AFFF is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.139 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.049 away. Black text reads best on it, at 9.10:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.10:1 |
| White text | 2.30:1 |
Values
| HEX | #63AFFF |
| RGB | rgb(99, 175, 255) |
| HSL | hsl(211, 100%, 69%) |
| OKLCH | oklch(73.9% 0.139 251.3) |
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 #63AFFF | 2.30:1 | Fails | Lc -50.1 | Large or bold text, headings |
| Black text on #63AFFF | 9.10:1 | AAA | Lc 58.7 | Large or bold text, headings |
| #63AFFF text on white | 2.30:1 | Fails | Lc 45.2 | Large or bold text, headings |
| #63AFFF text on black | 9.10:1 | AAA | Lc -56.8 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C2DCF9
oklch(88.5% 0.049 251.2)
-
Step 300
300
#97C5F8
oklch(80.9% 0.087 251.5)
-
Step 400
400 (this color)
#63AFFF
oklch(73.9% 0.139 251.3)
-
Step 500
500
#168BF0
oklch(63% 0.178 251.5)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#004279
oklch(37.6% 0.11 251.3)
-
Step 950
950
#042749
oklch(27% 0.074 251.8)
#63AFFF 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) | #8DB3FF | 0.046 |
| Deuteranopia (no green cones) | #78A4FD | 0.032 |
| Tritanopia (no blue cones) | #00C2CC | 0.113 |
| Achromatopsia (no color) | #ABABAB | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AFFF
#63AFFF
oklch(73.9% 0.139 251.3)
- #E19A36
#E19A36
oklch(74% 0.139 71.1)
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 #63AFFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.049
- Deep Sky Blue #00BFFF ΔE 0.054
- Periwinkle Blue #8F99FB ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.069
- Chefchaouen Blue #4895EF ΔE 0.077
- Lightblue #7BC8F6 ΔE 0.079
- Vivid Sky Blue #4CC9F0 ΔE 0.080
- Bright Sky Blue #02CCFE ΔE 0.082
Use #63AFFF 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.