#63AEFB
Closest named color: Carolina Blue (#8AB8FE). oklch(73.5% 0.135 250.7), rgb(99, 174, 251).
Aa
Black text reads best on this color (8.97:1).
About this color
#63AEFB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.135 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.051 away. Black text reads best on it, at 8.97:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.97:1 |
| White text | 2.33:1 |
Values
| HEX | #63AEFB |
| RGB | rgb(99, 174, 251) |
| HSL | hsl(210, 95%, 69%) |
| OKLCH | oklch(73.5% 0.135 250.7) |
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 #63AEFB | 2.33:1 | Fails | Lc -50.8 | Large or bold text, headings |
| Black text on #63AEFB | 8.97:1 | AAA | Lc 58.1 | Large or bold text, headings |
| #63AEFB text on white | 2.33:1 | Fails | Lc 45.9 | Large or bold text, headings |
| #63AEFB text on black | 8.97:1 | AAA | Lc -56.2 | 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
#DEEBFA
oklch(93.5% 0.025 251.9)
-
Step 200
200
#C3DCF8
oklch(88.5% 0.047 251.3)
-
Step 300
300
#98C5F6
oklch(80.9% 0.085 251)
-
Step 400
400 (this color)
#63AEFB
oklch(73.5% 0.135 250.7)
-
Step 500
500
#1A8CED
oklch(63.1% 0.173 250.8)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950
#042748
oklch(26.9% 0.073 251.2)
#63AEFB 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) | #8DB2FE | 0.047 |
| Deuteranopia (no green cones) | #79A3F9 | 0.033 |
| Tritanopia (no blue cones) | #00C0C9 | 0.110 |
| Achromatopsia (no color) | #A9A9A9 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AEFB
#63AEFB
oklch(73.5% 0.135 250.7)
- #DE993B
#DE993B
oklch(73.5% 0.135 70.8)
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 #63AEFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.051
- Deep Sky Blue #00BFFF ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.066
- Periwinkle Blue #8F99FB ΔE 0.068
- Chefchaouen Blue #4895EF ΔE 0.074
- Lightblue #7BC8F6 ΔE 0.080
- Vivid Sky Blue #4CC9F0 ΔE 0.080
- Bright Sky Blue #02CCFE ΔE 0.083
Use #63AEFB 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.