#63ADE0
Closest named color: Deep Sky Blue (#00BFFF). oklch(72% 0.105 240.5), rgb(99, 173, 224).
Aa
Black text reads best on this color (8.58:1).
About this color
#63ADE0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.105 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.063 away. Black text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.58:1 |
| White text | 2.44:1 |
Values
| HEX | #63ADE0 |
| RGB | rgb(99, 173, 224) |
| HSL | hsl(204, 67%, 63%) |
| OKLCH | oklch(72% 0.105 240.5) |
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 #63ADE0 | 2.44:1 | Fails | Lc -53.0 | Large or bold text, headings |
| Black text on #63ADE0 | 8.58:1 | AAA | Lc 56.0 | Large or bold text, headings |
| #63ADE0 text on white | 2.44:1 | Fails | Lc 48.0 | Large or bold text, headings |
| #63ADE0 text on black | 8.58:1 | AAA | Lc -54.0 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDEF
oklch(88.5% 0.036 239.2)
-
Step 300
300
#9BC7E7
oklch(80.9% 0.065 240.2)
-
Step 400
400 (this color)
#63ADE0
oklch(72% 0.105 240.5)
-
Step 500
500
#2392D2
oklch(63.1% 0.134 240.5)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#06293F
oklch(26.9% 0.056 241.4)
#63ADE0 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) | #96ADE2 | 0.056 |
| Deuteranopia (no green cones) | #85A0DF | 0.047 |
| Tritanopia (no blue cones) | #00BABE | 0.085 |
| Achromatopsia (no color) | #A6A6A6 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63ADE0
#63ADE0
oklch(72% 0.105 240.5)
- #D5955E
#D5955E
oklch(72.1% 0.105 60.6)
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 #63ADE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.063
- Greyblue #77A1B5 ΔE 0.063
- Carolina Blue #8AB8FE ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.068
- Bluegrey #85A3B2 ΔE 0.070
- Cornflower Blue #6495ED ΔE 0.073
- Vivid Sky Blue #4CC9F0 ΔE 0.074
- Bluey Grey #89A0B0 ΔE 0.075
Use #63ADE0 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.