#63B5FB
Closest named color: Carolina Blue (#8AB8FE). oklch(75% 0.13 246.4), rgb(99, 181, 251).
Aa
Black text reads best on this color (9.53:1).
About this color
#63B5FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.130 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.041 away. Black text reads best on it, at 9.53:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.53:1 |
| White text | 2.20:1 |
Values
| HEX | #63B5FB |
| RGB | rgb(99, 181, 251) |
| HSL | hsl(208, 95%, 69%) |
| OKLCH | oklch(75% 0.13 246.4) |
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 #63B5FB | 2.20:1 | Fails | Lc -47.9 | Large or bold text, headings |
| Black text on #63B5FB | 9.53:1 | AAA | Lc 60.8 | Content text, not long reading |
| #63B5FB text on white | 2.20:1 | Fails | Lc 43.1 | Non-text elements, placeholder text |
| #63B5FB text on black | 9.53:1 | AAA | Lc -59.0 | 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
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C2DDF6
oklch(88.6% 0.045 246.3)
-
Step 300
300
#96C6F2
oklch(80.8% 0.08 246.6)
-
Step 400
400 (this color)
#63B5FB
oklch(75% 0.13 246.4)
-
Step 500
500
#008FE5
oklch(63.1% 0.163 246.3)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#012845
oklch(26.9% 0.068 246.3)
#63B5FB 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) | #97B7FE | 0.055 |
| Deuteranopia (no green cones) | #82A8FA | 0.042 |
| Tritanopia (no blue cones) | #00C6CD | 0.103 |
| Achromatopsia (no color) | #AFAFAF | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B5FB
#63B5FB
oklch(75% 0.13 246.4)
- #E59C4B
#E59C4B
oklch(75% 0.13 66.2)
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 #63B5FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.041
- Deep Sky Blue #00BFFF ΔE 0.044
- Lightblue #7BC8F6 ΔE 0.061
- Vivid Sky Blue #4CC9F0 ΔE 0.062
- Bright Sky Blue #02CCFE ΔE 0.067
- Sky #82CAFC ΔE 0.068
- Pastel Blue #A2BFFE ΔE 0.075
- Light Sky Blue #87CEFA ΔE 0.081
Use #63B5FB 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.