#63B0DF
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.6% 0.103 237.3), rgb(99, 176, 223).
Aa
Black text reads best on this color (8.80:1).
About this color
#63B0DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.103 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.060 away. Black text reads best on it, at 8.80:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.80:1 |
| White text | 2.38:1 |
Values
| HEX | #63B0DF |
| RGB | rgb(99, 176, 223) |
| HSL | hsl(203, 66%, 63%) |
| OKLCH | oklch(72.6% 0.103 237.3) |
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 #63B0DF | 2.38:1 | Fails | Lc -51.8 | Large or bold text, headings |
| Black text on #63B0DF | 8.80:1 | AAA | Lc 57.2 | Large or bold text, headings |
| #63B0DF text on white | 2.38:1 | Fails | Lc 46.8 | Large or bold text, headings |
| #63B0DF text on black | 8.80:1 | AAA | Lc -55.2 | 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
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEE
oklch(88.4% 0.036 237.6)
-
Step 300
300
#9AC7E5
oklch(80.8% 0.064 237.8)
-
Step 400
400 (this color)
#63B0DF
oklch(72.6% 0.103 237.3)
-
Step 500
500
#1C93CE
oklch(63% 0.131 237.4)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#052A3D
oklch(27% 0.053 236.3)
#63B0DF 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) | #9AAFE1 | 0.060 |
| Deuteranopia (no green cones) | #89A2DE | 0.051 |
| Tritanopia (no blue cones) | #00BCC0 | 0.079 |
| Achromatopsia (no color) | #A8A8A8 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B0DF
#63B0DF
oklch(72.6% 0.103 237.3)
- #D79664
#D79664
oklch(72.6% 0.102 57.8)
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 #63B0DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.060
- Greyblue #77A1B5 ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.065
- Carolina Blue #8AB8FE ΔE 0.065
- Vivid Sky Blue #4CC9F0 ΔE 0.066
- Bluegrey #85A3B2 ΔE 0.069
- Lightblue #7BC8F6 ΔE 0.074
- Bluey Grey #89A0B0 ΔE 0.075
Use #63B0DF 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.