#63B5DC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(73.6% 0.098 230.7), rgb(99, 181, 220).
Aa
Black text reads best on this color (9.17:1).
About this color
#63B5DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.098 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.054 away. Black text reads best on it, at 9.17:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.17:1 |
| White text | 2.28:1 |
Values
| HEX | #63B5DC |
| RGB | rgb(99, 181, 220) |
| HSL | hsl(199, 63%, 63%) |
| OKLCH | oklch(73.6% 0.098 230.7) |
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 #63B5DC | 2.28:1 | Fails | Lc -49.8 | Large or bold text, headings |
| Black text on #63B5DC | 9.17:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #63B5DC text on white | 2.28:1 | Fails | Lc 45.0 | Non-text elements, placeholder text |
| #63B5DC text on black | 9.17:1 | AAA | Lc -57.1 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C3DEEC
oklch(88.5% 0.035 230.3)
-
Step 300
300
#98C9E1
oklch(81% 0.061 229.5)
-
Step 400
400 (this color)
#63B5DC
oklch(73.6% 0.098 230.7)
-
Step 500
500
#0996C7
oklch(63.1% 0.125 230.8)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#032B3B
oklch(27.1% 0.051 230.2)
#63B5DC 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) | #A1B3DE | 0.068 |
| Deuteranopia (no green cones) | #90A6DB | 0.059 |
| Tritanopia (no blue cones) | #00C0C2 | 0.071 |
| Achromatopsia (no color) | #ABABAB | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B5DC
#63B5DC
oklch(73.6% 0.098 230.7)
- #DC9870
#DC9870
oklch(73.7% 0.098 51.1)
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 #63B5DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.054
- Deep Sky Blue #00BFFF ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.062
- Lightblue #7BC8F6 ΔE 0.065
- Carolina Blue #8AB8FE ΔE 0.067
- Greyblue #77A1B5 ΔE 0.067
- Light Grey Blue #9DBCD4 ΔE 0.068
- Light Cornflower Blue #98C1D9 ΔE 0.068
Use #63B5DC 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.