#63AFE4
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.6% 0.108 240.9), rgb(99, 175, 228).
Aa
Black text reads best on this color (8.78:1).
About this color
#63AFE4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.108 and its hue 241°. 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 8.78:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.78:1 |
| White text | 2.39:1 |
Values
| HEX | #63AFE4 |
| RGB | rgb(99, 175, 228) |
| HSL | hsl(205, 70%, 64%) |
| OKLCH | oklch(72.6% 0.108 240.9) |
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 #63AFE4 | 2.39:1 | Fails | Lc -51.9 | Large or bold text, headings |
| Black text on #63AFE4 | 8.78:1 | AAA | Lc 57.1 | Large or bold text, headings |
| #63AFE4 text on white | 2.39:1 | Fails | Lc 46.9 | Large or bold text, headings |
| #63AFE4 text on black | 8.78:1 | AAA | Lc -55.1 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDF0
oklch(88.5% 0.037 240.7)
-
Step 300
300
#9AC7E9
oklch(80.9% 0.068 241.3)
-
Step 400
400 (this color)
#63AFE4
oklch(72.6% 0.108 240.9)
-
Step 500
500
#1D92D4
oklch(63.1% 0.138 240.7)
-
Step 600
600
#007BB7
oklch(55.7% 0.129 240.7)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#05293F
oklch(26.9% 0.057 240.8)
#63AFE4 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) | #97AFE6 | 0.057 |
| Deuteranopia (no green cones) | #86A2E3 | 0.047 |
| Tritanopia (no blue cones) | #00BCC1 | 0.085 |
| Achromatopsia (no color) | #A8A8A8 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63AFE4
#63AFE4
oklch(72.6% 0.108 240.9)
- #D8965D
#D8965D
oklch(72.6% 0.108 60.7)
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 #63AFE4, 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 0.061
- Vivid Sky Blue #4CC9F0 ΔE 0.068
- Greyblue #77A1B5 ΔE 0.069
- Turquoise Blue #06B1C4 ΔE 0.071
- Lightblue #7BC8F6 ΔE 0.075
- Bluegrey #85A3B2 ΔE 0.075
- Cornflower Blue #6495ED ΔE 0.075
Use #63AFE4 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.