#63B9EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.1% 0.109 235.7), rgb(99, 185, 234).
Aa
Black text reads best on this color (9.65:1).
About this color
#63B9EA is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.109 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.043 away. Black text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.65:1 |
| White text | 2.17:1 |
Values
| HEX | #63B9EA |
| RGB | rgb(99, 185, 234) |
| HSL | hsl(202, 76%, 65%) |
| OKLCH | oklch(75.1% 0.109 235.7) |
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 #63B9EA | 2.17:1 | Fails | Lc -47.3 | Large or bold text, headings |
| Black text on #63B9EA | 9.65:1 | AAA | Lc 61.4 | Content text, not long reading |
| #63B9EA text on white | 2.17:1 | Fails | Lc 42.6 | Non-text elements, placeholder text |
| #63B9EA text on black | 9.65:1 | AAA | Lc -59.6 | 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
#DEECF5
oklch(93.5% 0.019 235.7)
-
Step 200
200
#C2DEEF
oklch(88.5% 0.038 234.5)
-
Step 300
300
#96C8E7
oklch(80.8% 0.068 235.9)
-
Step 400
400 (this color)
#63B9EA
oklch(75.1% 0.109 235.7)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#63B9EA 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) | #A2B8EC | 0.067 |
| Deuteranopia (no green cones) | #8FAAE9 | 0.056 |
| Tritanopia (no blue cones) | #00C6C9 | 0.081 |
| Achromatopsia (no color) | #B0B0B0 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B9EA
#63B9EA
oklch(75.1% 0.109 235.7)
- #E39C68
#E39C68
oklch(75.1% 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 #63B9EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Deep Sky Blue #00BFFF ΔE 0.045
- Lightblue #7BC8F6 ΔE 0.050
- Carolina Blue #8AB8FE ΔE 0.051
- Bright Sky Blue #02CCFE ΔE 0.057
- Sky #82CAFC ΔE 0.060
- Light Cornflower Blue #98C1D9 ΔE 0.066
- Light Grey Blue #9DBCD4 ΔE 0.068
Use #63B9EA 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.