#63C5EF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(78% 0.11 228.6), rgb(99, 197, 239).
Aa
Black text reads best on this color (10.76:1).
About this color
#63C5EF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.110 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.017 away. Black text reads best on it, at 10.76:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.76:1 |
| White text | 1.95:1 |
Values
| HEX | #63C5EF |
| RGB | rgb(99, 197, 239) |
| HSL | hsl(198, 81%, 66%) |
| OKLCH | oklch(78% 0.11 228.6) |
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 #63C5EF | 1.95:1 | Fails | Lc -41.6 | Non-text elements, placeholder text |
| Black text on #63C5EF | 10.76:1 | AAA | Lc 66.6 | Content text, not long reading |
| #63C5EF text on white | 1.95:1 | Fails | Lc 37.3 | Non-text elements, placeholder text |
| #63C5EF text on black | 10.76:1 | AAA | Lc -65.1 | 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
#D5EFFB
oklch(93.7% 0.032 227.2)
-
Step 200
200
#B0E2F9
oklch(88.6% 0.06 227.8)
-
Step 300
300 (this color)
#63C5EF
oklch(78% 0.11 228.6)
-
Step 400
400
#00B0E4
oklch(70.7% 0.138 228.2)
-
Step 500
500
#0097C4
oklch(63.2% 0.123 228.1)
-
Step 600
600
#007FA6
oklch(55.7% 0.109 228.5)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004860
oklch(37.5% 0.074 228.7)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#63C5EF 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) | #AFC2F1 | 0.079 |
| Deuteranopia (no green cones) | #9BB3EE | 0.069 |
| Tritanopia (no blue cones) | #00D1D3 | 0.072 |
| Achromatopsia (no color) | #BABABA | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C5EF
#63C5EF
oklch(78% 0.11 228.6)
- #F1A278
#F1A278
oklch(78.1% 0.11 48.6)
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 #63C5EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.017
- Lightblue #7BC8F6 ΔE 0.026
- Sky #82CAFC ΔE 0.037
- Bright Sky Blue #02CCFE ΔE 0.039
- Sky Blue #87CEEB ΔE 0.044
- Light Sky Blue #87CEFA ΔE 0.045
- Deep Sky Blue #00BFFF ΔE 0.051
- Light Cornflower Blue #98C1D9 ΔE 0.055
Use #63C5EF 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.