#63B8EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.9% 0.11 236.6), rgb(99, 184, 234).
Aa
Black text reads best on this color (9.57:1).
About this color
#63B8EA is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.110 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.045 away. Black text reads best on it, at 9.57:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.57:1 |
| White text | 2.19:1 |
Values
| HEX | #63B8EA |
| RGB | rgb(99, 184, 234) |
| HSL | hsl(202, 76%, 65%) |
| OKLCH | oklch(74.9% 0.11 236.6) |
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 #63B8EA | 2.19:1 | Fails | Lc -47.7 | Large or bold text, headings |
| Black text on #63B8EA | 9.57:1 | AAA | Lc 61.0 | Content text, not long reading |
| #63B8EA text on white | 2.19:1 | Fails | Lc 43.0 | Non-text elements, placeholder text |
| #63B8EA text on black | 9.57:1 | AAA | Lc -59.2 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C2DEEF
oklch(88.5% 0.038 234.5)
-
Step 300
300
#96C8E8
oklch(80.9% 0.069 236.8)
-
Step 400
400 (this color)
#63B8EA
oklch(74.9% 0.11 236.6)
-
Step 500
500
#0094D1
oklch(63.1% 0.137 236.6)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#012A3F
oklch(27% 0.058 237)
#63B8EA 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) | #A1B7EC | 0.066 |
| Deuteranopia (no green cones) | #8EA9E9 | 0.056 |
| Tritanopia (no blue cones) | #00C5C9 | 0.081 |
| Achromatopsia (no color) | #AFAFAF | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B8EA
#63B8EA
oklch(74.9% 0.11 236.6)
- #E29B67
#E29B67
oklch(74.8% 0.109 56.4)
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 #63B8EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.045
- Deep Sky Blue #00BFFF ΔE 0.046
- Carolina Blue #8AB8FE ΔE 0.051
- Lightblue #7BC8F6 ΔE 0.052
- Bright Sky Blue #02CCFE ΔE 0.059
- Sky #82CAFC ΔE 0.062
- Light Cornflower Blue #98C1D9 ΔE 0.068
- Light Grey Blue #9DBCD4 ΔE 0.069
Use #63B8EA 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.