#63CBE4
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(79% 0.102 215.7), rgb(99, 203, 228).
Aa
Black text reads best on this color (11.19:1).
About this color
#63CBE4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.102 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.024 away. Black text reads best on it, at 11.19:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.19:1 |
| White text | 1.87:1 |
Values
| HEX | #63CBE4 |
| RGB | rgb(99, 203, 228) |
| HSL | hsl(192, 70%, 64%) |
| OKLCH | oklch(79% 0.102 215.7) |
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 #63CBE4 | 1.87:1 | Fails | Lc -39.5 | Non-text elements, placeholder text |
| Black text on #63CBE4 | 11.19:1 | AAA | Lc 68.6 | Content text, not long reading |
| #63CBE4 text on white | 1.87:1 | Fails | Lc 35.3 | Non-text elements, placeholder text |
| #63CBE4 text on black | 11.19:1 | AAA | Lc -67.2 | 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
#ECF8FB
oklch(97.1% 0.013 214.4)
-
Step 100
100
#D5EFF7
oklch(93.6% 0.029 218.2)
-
Step 200
200
#AFE3F1
oklch(88.4% 0.057 216.1)
-
Step 300
300 (this color)
#63CBE4
oklch(79% 0.102 215.7)
-
Step 400
400
#00B3D2
oklch(70.6% 0.125 216)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#63CBE4 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) | #BAC5E5 | 0.092 |
| Deuteranopia (no green cones) | #A6B7E4 | 0.082 |
| Tritanopia (no blue cones) | #00D4D3 | 0.055 |
| Achromatopsia (no color) | #BDBDBD | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63CBE4
#63CBE4
oklch(79% 0.102 215.7)
- #F4A38D
#F4A38D
oklch(79% 0.102 35.9)
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 #63CBE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.024
- Sky Blue #87CEEB ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.037
- Aqua Blue #02D8E9 ΔE 0.044
- Sky #82CAFC ΔE 0.047
- Medium Turquoise #48D1CC ΔE 0.048
- Light Sky Blue #87CEFA ΔE 0.048
- Bright Sky Blue #02CCFE ΔE 0.048
Use #63CBE4 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.