#63B5DA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(73.5% 0.096 229.3), rgb(99, 181, 218).
Aa
Black text reads best on this color (9.15:1).
About this color
#63B5DA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.096 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.055 away. Black text reads best on it, at 9.15:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.15:1 |
| White text | 2.29:1 |
Values
| HEX | #63B5DA |
| RGB | rgb(99, 181, 218) |
| HSL | hsl(199, 62%, 62%) |
| OKLCH | oklch(73.5% 0.096 229.3) |
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 #63B5DA | 2.29:1 | Fails | Lc -49.9 | Large or bold text, headings |
| Black text on #63B5DA | 9.15:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #63B5DA text on white | 2.29:1 | Fails | Lc 45.1 | Large or bold text, headings |
| #63B5DA text on black | 9.15:1 | AAA | Lc -57.0 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C4DEEB
oklch(88.5% 0.033 229.3)
-
Step 300
300
#99C9E0
oklch(81% 0.06 228.9)
-
Step 400
400 (this color)
#63B5DA
oklch(73.5% 0.096 229.3)
-
Step 500
500
#0A96C5
oklch(63% 0.124 229.7)
-
Step 600
600
#007EA7
oklch(55.5% 0.111 230)
-
Step 700
700
#006A8D
oklch(49.1% 0.098 229.8)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#032B3A
oklch(27.1% 0.05 228.5)
#63B5DA 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) | #A2B2DC | 0.069 |
| Deuteranopia (no green cones) | #91A6DA | 0.060 |
| Tritanopia (no blue cones) | #00BFC1 | 0.069 |
| Achromatopsia (no color) | #ABABAB | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B5DA
#63B5DA
oklch(73.5% 0.096 229.3)
- #DB9772
#DB9772
oklch(73.5% 0.097 49.3)
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 #63B5DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.061
- Greyblue #77A1B5 ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.066
- Light Grey Blue #9DBCD4 ΔE 0.067
- Bluegrey #85A3B2 ΔE 0.068
- Light Cornflower Blue #98C1D9 ΔE 0.068
Use #63B5DA 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.