#63ADE9
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.4% 0.115 244.8), rgb(99, 173, 233).
Aa
Black text reads best on this color (8.68:1).
About this color
#63ADE9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.115 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.058 away. Black text reads best on it, at 8.68:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.68:1 |
| White text | 2.41:1 |
Values
| HEX | #63ADE9 |
| RGB | rgb(99, 173, 233) |
| HSL | hsl(207, 75%, 65%) |
| OKLCH | oklch(72.4% 0.115 244.8) |
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 #63ADE9 | 2.41:1 | Fails | Lc -52.4 | Large or bold text, headings |
| Black text on #63ADE9 | 8.68:1 | AAA | Lc 56.6 | Large or bold text, headings |
| #63ADE9 text on white | 2.41:1 | Fails | Lc 47.4 | Large or bold text, headings |
| #63ADE9 text on black | 8.68:1 | AAA | Lc -54.6 | 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
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DDF2
oklch(88.6% 0.039 243.5)
-
Step 300
300
#9AC6EC
oklch(80.8% 0.071 244.9)
-
Step 400
400 (this color)
#63ADE9
oklch(72.4% 0.115 244.8)
-
Step 500
500
#2190DB
oklch(63.1% 0.147 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0065A1
oklch(49% 0.124 245.1)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#062942
oklch(27.1% 0.061 244.7)
#63ADE9 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) | #93AEEC | 0.053 |
| Deuteranopia (no green cones) | #81A1E8 | 0.041 |
| Tritanopia (no blue cones) | #00BBC2 | 0.092 |
| Achromatopsia (no color) | #A7A7A7 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63ADE9
#63ADE9
oklch(72.4% 0.115 244.8)
- #D79653
#D79653
oklch(72.4% 0.115 65.1)
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 #63ADE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.058
- Carolina Blue #8AB8FE ΔE 0.060
- Cornflower Blue #6495ED ΔE 0.067
- Vivid Sky Blue #4CC9F0 ΔE 0.074
- Greyblue #77A1B5 ΔE 0.075
- Chefchaouen Blue #4895EF ΔE 0.075
- Periwinkle Blue #8F99FB ΔE 0.078
- Turquoise Blue #06B1C4 ΔE 0.078
Use #63ADE9 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.