#63C3ED
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.5% 0.108 229), rgb(99, 195, 237).
Aa
Black text reads best on this color (10.55:1).
About this color
#63C3ED is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.108 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.020 away. Black text reads best on it, at 10.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.55:1 |
| White text | 1.98:1 |
Values
| HEX | #63C3ED |
| RGB | rgb(99, 195, 237) |
| HSL | hsl(198, 79%, 66%) |
| OKLCH | oklch(77.5% 0.108 229) |
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 #63C3ED | 1.98:1 | Fails | Lc -42.7 | Non-text elements, placeholder text |
| Black text on #63C3ED | 10.55:1 | AAA | Lc 65.7 | Content text, not long reading |
| #63C3ED text on white | 1.98:1 | Fails | Lc 38.2 | Non-text elements, placeholder text |
| #63C3ED text on black | 10.55:1 | AAA | Lc -64.1 | 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
#ECF8FD
oklch(97.2% 0.014 224.5)
-
Step 100
100
#D5EEFB
oklch(93.5% 0.032 230.3)
-
Step 200
200
#B0E2F9
oklch(88.6% 0.06 227.8)
-
Step 300
300 (this color)
#63C3ED
oklch(77.5% 0.108 229)
-
Step 400
400
#00B0E5
oklch(70.8% 0.139 228.7)
-
Step 500
500
#0096C5
oklch(63% 0.125 229.4)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
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
#002B3B
oklch(27% 0.053 228.8)
#63C3ED 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) | #ADC0EF | 0.077 |
| Deuteranopia (no green cones) | #9AB1EC | 0.069 |
| Tritanopia (no blue cones) | #00CFD1 | 0.072 |
| Achromatopsia (no color) | #B8B8B8 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C3ED
#63C3ED
oklch(77.5% 0.108 229)
- #EEA177
#EEA177
oklch(77.5% 0.108 49.2)
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 #63C3ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.020
- Lightblue #7BC8F6 ΔE 0.029
- Sky #82CAFC ΔE 0.041
- Bright Sky Blue #02CCFE ΔE 0.042
- Sky Blue #87CEEB ΔE 0.048
- Deep Sky Blue #00BFFF ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.050
- Light Cornflower Blue #98C1D9 ΔE 0.055
Use #63C3ED 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.