#63C5EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.8% 0.106 225.4), rgb(99, 197, 234).
Aa
Black text reads best on this color (10.70:1).
About this color
#63C5EA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.106 and its hue 225°. 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 10.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.70:1 |
| White text | 1.96:1 |
Values
| HEX | #63C5EA |
| RGB | rgb(99, 197, 234) |
| HSL | hsl(196, 76%, 65%) |
| OKLCH | oklch(77.8% 0.106 225.4) |
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 #63C5EA | 1.96:1 | Fails | Lc -41.9 | Non-text elements, placeholder text |
| Black text on #63C5EA | 10.70:1 | AAA | Lc 66.3 | Content text, not long reading |
| #63C5EA text on white | 1.96:1 | Fails | Lc 37.6 | Non-text elements, placeholder text |
| #63C5EA text on black | 10.70:1 | AAA | Lc -64.9 | 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
#D5EFFA
oklch(93.7% 0.031 225.1)
-
Step 200
200
#B0E2F7
oklch(88.5% 0.059 225.5)
-
Step 300
300 (this color)
#63C5EA
oklch(77.8% 0.106 225.4)
-
Step 400
400
#00B1DF
oklch(70.7% 0.134 225)
-
Step 500
500
#0097C0
oklch(63% 0.12 225.7)
-
Step 600
600
#007FA2
oklch(55.5% 0.106 225.7)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#00495E
oklch(37.7% 0.071 225)
-
Step 950
950
#002B39
oklch(26.9% 0.051 225.5)
#63C5EA 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) | #B1C1EC | 0.082 |
| Deuteranopia (no green cones) | #9DB3EA | 0.072 |
| Tritanopia (no blue cones) | #00D0D1 | 0.067 |
| Achromatopsia (no color) | #B9B9B9 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63C5EA
#63C5EA
oklch(77.8% 0.106 225.4)
- #EFA17D
#EFA17D
oklch(77.8% 0.105 45.5)
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 #63C5EA, 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 0.030
- Sky #82CAFC ΔE 0.042
- Bright Sky Blue #02CCFE ΔE 0.042
- Sky Blue #87CEEB ΔE 0.044
- Light Sky Blue #87CEFA ΔE 0.048
- Light Cornflower Blue #98C1D9 ΔE 0.053
- Deep Sky Blue #00BFFF ΔE 0.055
Use #63C5EA 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.