#63C4FF
Closest named color: Lightblue (#7BC8F6). oklch(78.5% 0.124 237.9), rgb(99, 196, 255).
Aa
Black text reads best on this color (10.87:1).
About this color
#63C4FF is a light, moderately saturated blue. In OKLCH its lightness is 79%, its chroma 0.124 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Lightblue (#7BC8F6), ΔE 0.028 away. Black text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Lightblue (#7BC8F6) |
| Black text | 10.87:1 |
| White text | 1.93:1 |
Values
| HEX | #63C4FF |
| RGB | rgb(99, 196, 255) |
| HSL | hsl(203, 100%, 69%) |
| OKLCH | oklch(78.5% 0.124 237.9) |
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 #63C4FF | 1.93:1 | Fails | Lc -41.1 | Non-text elements, placeholder text |
| Black text on #63C4FF | 10.87:1 | AAA | Lc 67.1 | Content text, not long reading |
| #63C4FF text on white | 1.93:1 | Fails | Lc 36.8 | Non-text elements, placeholder text |
| #63C4FF text on black | 10.87:1 | AAA | Lc -65.7 | 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
#ECF7FF
oklch(97% 0.016 239.1)
-
Step 100
100
#D5EEFF
oklch(93.6% 0.035 237.5)
-
Step 200
200
#B2E0FF
oklch(88.5% 0.064 237.9)
-
Step 300
300 (this color)
#63C4FF
oklch(78.5% 0.124 237.9)
-
Step 400
400
#00ACF6
oklch(70.7% 0.157 238.1)
-
Step 500
500
#0093D3
oklch(63% 0.14 238.1)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#63C4FF 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) | #A9C3FF | 0.071 |
| Deuteranopia (no green cones) | #93B3FE | 0.060 |
| Tritanopia (no blue cones) | #00D3D8 | 0.089 |
| Achromatopsia (no color) | #BABABA | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C4FF
#63C4FF
oklch(78.5% 0.124 237.9)
- #F4A465
#F4A465
oklch(78.5% 0.124 57.9)
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 #63C4FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lightblue #7BC8F6 ΔE 0.028
- Vivid Sky Blue #4CC9F0 ΔE 0.033
- Sky #82CAFC ΔE 0.034
- Bright Sky Blue #02CCFE ΔE 0.040
- Deep Sky Blue #00BFFF ΔE 0.044
- Carolina Blue #8AB8FE ΔE 0.045
- Light Sky Blue #87CEFA ΔE 0.046
- Sky Blue #87CEEB ΔE 0.056
Use #63C4FF 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.