#63C4E4
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.4% 0.102 222.1), rgb(99, 196, 228).
Aa
Black text reads best on this color (10.54:1).
About this color
#63C4E4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.102 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.021 away. Black text reads best on it, at 10.54:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.54:1 |
| White text | 1.99:1 |
Values
| HEX | #63C4E4 |
| RGB | rgb(99, 196, 228) |
| HSL | hsl(195, 70%, 64%) |
| OKLCH | oklch(77.4% 0.102 222.1) |
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 #63C4E4 | 1.99:1 | Fails | Lc -42.7 | Non-text elements, placeholder text |
| Black text on #63C4E4 | 10.54:1 | AAA | Lc 65.6 | Content text, not long reading |
| #63C4E4 text on white | 1.99:1 | Fails | Lc 38.3 | Non-text elements, placeholder text |
| #63C4E4 text on black | 10.54:1 | 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
#ECF8FC
oklch(97.1% 0.014 219.6)
-
Step 100
100
#D6EFF8
oklch(93.7% 0.029 221.4)
-
Step 200
200
#B1E2F4
oklch(88.4% 0.056 222.4)
-
Step 300
300 (this color)
#63C4E4
oklch(77.4% 0.102 222.1)
-
Step 400
400
#00B2DB
oklch(70.8% 0.131 222.1)
-
Step 500
500
#0098BC
oklch(63% 0.117 222.5)
-
Step 600
600
#00809E
oklch(55.6% 0.103 221.9)
-
Step 700
700
#006C86
oklch(49.3% 0.091 222.1)
-
Step 800
800
#00586E
oklch(42.7% 0.079 222.3)
-
Step 900
900
#00495C
oklch(37.6% 0.07 222.6)
-
Step 950
950
#002C38
oklch(27.2% 0.05 221.4)
#63C4E4 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) | #B1C0E6 | 0.083 |
| Deuteranopia (no green cones) | #9EB2E4 | 0.073 |
| Tritanopia (no blue cones) | #00CECE | 0.062 |
| Achromatopsia (no color) | #B8B8B8 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C4E4
#63C4E4
oklch(77.4% 0.102 222.1)
- #EDA081
#EDA081
oklch(77.4% 0.102 42.7)
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 #63C4E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.021
- Lightblue #7BC8F6 ΔE 0.036
- Sky Blue #87CEEB ΔE 0.046
- Bright Sky Blue #02CCFE ΔE 0.047
- Sky #82CAFC ΔE 0.048
- Light Cornflower Blue #98C1D9 ΔE 0.051
- Light Sky Blue #87CEFA ΔE 0.054
- Deep Sky Blue #00BFFF ΔE 0.059
Use #63C4E4 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.