#63ADFB
Closest named color: Carolina Blue (#8AB8FE). oklch(73.3% 0.136 251.3), rgb(99, 173, 251).
Aa
Black text reads best on this color (8.90:1).
About this color
#63ADFB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.136 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.053 away. Black text reads best on it, at 8.90:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.90:1 |
| White text | 2.35:1 |
Values
| HEX | #63ADFB |
| RGB | rgb(99, 173, 251) |
| HSL | hsl(211, 95%, 69%) |
| OKLCH | oklch(73.3% 0.136 251.3) |
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 #63ADFB | 2.35:1 | Fails | Lc -51.2 | Large or bold text, headings |
| Black text on #63ADFB | 8.90:1 | AAA | Lc 57.7 | Large or bold text, headings |
| #63ADFB text on white | 2.35:1 | Fails | Lc 46.3 | Large or bold text, headings |
| #63ADFB text on black | 8.90:1 | AAA | Lc -55.8 | 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
#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)
#63ADFB
oklch(73.3% 0.136 251.3)
-
Step 500
500
#1D8CEE
oklch(63.2% 0.174 251.2)
-
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
#052748
oklch(27% 0.072 251.7)
#63ADFB 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) | #8CB1FE | 0.046 |
| Deuteranopia (no green cones) | #77A2F9 | 0.032 |
| Tritanopia (no blue cones) | #00BFC9 | 0.110 |
| Achromatopsia (no color) | #A9A9A9 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63ADFB
#63ADFB
oklch(73.3% 0.136 251.3)
- #DD9838
#DD9838
oklch(73.2% 0.136 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 #63ADFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.053
- Deep Sky Blue #00BFFF ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.063
- Periwinkle Blue #8F99FB ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.072
- Lightblue #7BC8F6 ΔE 0.082
- Vivid Sky Blue #4CC9F0 ΔE 0.082
- Bright Sky Blue #02CCFE ΔE 0.086
Use #63ADFB 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.