#63C0EF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.9% 0.111 232.7), rgb(99, 192, 239).
Aa
Black text reads best on this color (10.31:1).
About this color
#63C0EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.111 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.027 away. Black text reads best on it, at 10.31:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.31:1 |
| White text | 2.03:1 |
Values
| HEX | #63C0EF |
| RGB | rgb(99, 192, 239) |
| HSL | hsl(200, 81%, 66%) |
| OKLCH | oklch(76.9% 0.111 232.7) |
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 #63C0EF | 2.03:1 | Fails | Lc -43.9 | Non-text elements, placeholder text |
| Black text on #63C0EF | 10.31:1 | AAA | Lc 64.5 | Content text, not long reading |
| #63C0EF text on white | 2.03:1 | Fails | Lc 39.4 | Non-text elements, placeholder text |
| #63C0EF text on black | 10.31:1 | AAA | Lc -63.0 | 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
#ECF7FE
oklch(97% 0.015 235.4)
-
Step 100
100
#D6EEFC
oklch(93.6% 0.032 233.3)
-
Step 200
200
#B1E1FC
oklch(88.5% 0.062 233)
-
Step 300
300 (this color)
#63C0EF
oklch(76.9% 0.111 232.7)
-
Step 400
400
#00AEEC
oklch(70.6% 0.146 233.1)
-
Step 500
500
#0095CB
oklch(63% 0.131 233.2)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#63C0EF 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) | #A9BEF1 | 0.073 |
| Deuteranopia (no green cones) | #95AFEE | 0.063 |
| Tritanopia (no blue cones) | #00CDCF | 0.079 |
| Achromatopsia (no color) | #B6B6B6 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C0EF
#63C0EF
oklch(76.9% 0.111 232.7)
- #ECA06F
#ECA06F
oklch(77% 0.111 53.2)
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 #63C0EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.027
- Lightblue #7BC8F6 ΔE 0.033
- Bright Sky Blue #02CCFE ΔE 0.044
- Sky #82CAFC ΔE 0.044
- Deep Sky Blue #00BFFF ΔE 0.045
- Carolina Blue #8AB8FE ΔE 0.051
- Light Sky Blue #87CEFA ΔE 0.055
- Sky Blue #87CEEB ΔE 0.055
Use #63C0EF 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.