#63C9DB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(78.2% 0.098 210.6), rgb(99, 201, 219).
Aa
Black text reads best on this color (10.90:1).
About this color
#63C9DB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.098 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.033 away. Black text reads best on it, at 10.90:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.90:1 |
| White text | 1.92:1 |
Values
| HEX | #63C9DB |
| RGB | rgb(99, 201, 219) |
| HSL | hsl(189, 62%, 62%) |
| OKLCH | oklch(78.2% 0.098 210.6) |
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 #63C9DB | 1.92:1 | Fails | Lc -40.9 | Non-text elements, placeholder text |
| Black text on #63C9DB | 10.90:1 | AAA | Lc 67.3 | Content text, not long reading |
| #63C9DB text on white | 1.92:1 | Fails | Lc 36.6 | Non-text elements, placeholder text |
| #63C9DB text on black | 10.90:1 | AAA | Lc -65.8 | Content text, not long reading |
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 300.
-
Step 50
50
#ECF8FA
oklch(97.1% 0.013 208.8)
-
Step 100
100
#D5EFF5
oklch(93.5% 0.028 213.2)
-
Step 200
200
#B0E4ED
oklch(88.6% 0.055 209.3)
-
Step 300
300 (this color)
#63C9DB
oklch(78.2% 0.098 210.6)
-
Step 400
400
#00B4CB
oklch(70.6% 0.122 210.8)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005A66
oklch(42.9% 0.074 210.4)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#63C9DB 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) | #BAC3DC | 0.093 |
| Deuteranopia (no green cones) | #A7B5DB | 0.084 |
| Tritanopia (no blue cones) | #00D1CE | 0.050 |
| Achromatopsia (no color) | #BBBBBB | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C9DB
#63C9DB
oklch(78.2% 0.098 210.6)
- #F0A092
#F0A092
oklch(78.1% 0.098 30.3)
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 #63C9DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.033
- Medium Turquoise #48D1CC ΔE 0.040
- Sky Blue #87CEEB ΔE 0.044
- Dark Turquoise #00CED1 ΔE 0.044
- Aqua Blue #02D8E9 ΔE 0.047
- Lightblue #7BC8F6 ΔE 0.048
- Light Cornflower Blue #98C1D9 ΔE 0.053
- Bright Sky Blue #02CCFE ΔE 0.056
Use #63C9DB 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.