#63B3DC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(73.2% 0.099 232.6), rgb(99, 179, 220).
Aa
Black text reads best on this color (9.01:1).
About this color
#63B3DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.099 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.059 away. Black text reads best on it, at 9.01:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.01:1 |
| White text | 2.33:1 |
Values
| HEX | #63B3DC |
| RGB | rgb(99, 179, 220) |
| HSL | hsl(200, 63%, 63%) |
| OKLCH | oklch(73.2% 0.099 232.6) |
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 #63B3DC | 2.33:1 | Fails | Lc -50.7 | Large or bold text, headings |
| Black text on #63B3DC | 9.01:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #63B3DC text on white | 2.33:1 | Fails | Lc 45.8 | Large or bold text, headings |
| #63B3DC text on black | 9.01:1 | AAA | Lc -56.3 | 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
#C4DEEC
oklch(88.6% 0.034 231.2)
-
Step 300
300
#99C8E2
oklch(80.8% 0.062 232.7)
-
Step 400
400 (this color)
#63B3DC
oklch(73.2% 0.099 232.6)
-
Step 500
500
#1395C9
oklch(63.1% 0.127 233)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#042A3B
oklch(26.9% 0.052 232.8)
#63B3DC 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) | #9FB1DE | 0.066 |
| Deuteranopia (no green cones) | #8EA4DB | 0.057 |
| Tritanopia (no blue cones) | #00BEC0 | 0.074 |
| Achromatopsia (no color) | #AAAAAA | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B3DC
#63B3DC
oklch(73.2% 0.099 232.6)
- #DA976D
#DA976D
oklch(73.3% 0.099 52.7)
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 #63B3DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.059
- Deep Sky Blue #00BFFF ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.061
- Greyblue #77A1B5 ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.067
- Bluegrey #85A3B2 ΔE 0.068
- Lightblue #7BC8F6 ΔE 0.069
- Light Grey Blue #9DBCD4 ΔE 0.071
Use #63B3DC 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.