#63BBD5
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.7% 0.092 219.4), rgb(99, 187, 213).
Aa
Black text reads best on this color (9.59:1).
About this color
#63BBD5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.092 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.046 away. Black text reads best on it, at 9.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.59:1 |
| White text | 2.18:1 |
Values
| HEX | #63BBD5 |
| RGB | rgb(99, 187, 213) |
| HSL | hsl(194, 58%, 61%) |
| OKLCH | oklch(74.7% 0.092 219.4) |
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 #63BBD5 | 2.18:1 | Fails | Lc -47.6 | Large or bold text, headings |
| Black text on #63BBD5 | 9.59:1 | AAA | Lc 61.1 | Content text, not long reading |
| #63BBD5 text on white | 2.18:1 | Fails | Lc 42.9 | Non-text elements, placeholder text |
| #63BBD5 text on black | 9.59:1 | AAA | Lc -59.3 | 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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DEEDF2
oklch(93.6% 0.017 219.7)
-
Step 200
200
#C3DFE8
oklch(88.6% 0.032 219.1)
-
Step 300
300
#97CADA
oklch(80.9% 0.058 219.1)
-
Step 400
400 (this color)
#63BBD5
oklch(74.7% 0.092 219.4)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809B
oklch(55.5% 0.101 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#63BBD5 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) | #ABB7D6 | 0.079 |
| Deuteranopia (no green cones) | #9AAAD5 | 0.071 |
| Tritanopia (no blue cones) | #00C4C3 | 0.059 |
| Achromatopsia (no color) | #AFAFAF | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BBD5
#63BBD5
oklch(74.7% 0.092 219.4)
- #E09981
#E09981
oklch(74.7% 0.092 39.5)
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 #63BBD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.046
- Light Cornflower Blue #98C1D9 ΔE 0.059
- Lightblue #7BC8F6 ΔE 0.060
- Light Grey Blue #9DBCD4 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.061
- Dark Turquoise #00CED1 ΔE 0.064
- Deep Sky Blue #00BFFF ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.067
Use #63BBD5 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.