#63BDEA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76% 0.108 232.3), rgb(99, 189, 234).
Aa
Black text reads best on this color (9.99:1).
About this color
#63BDEA is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.108 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.033 away. Black text reads best on it, at 9.99:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.99:1 |
| White text | 2.10:1 |
Values
| HEX | #63BDEA |
| RGB | rgb(99, 189, 234) |
| HSL | hsl(200, 76%, 65%) |
| OKLCH | oklch(76% 0.108 232.3) |
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 #63BDEA | 2.10:1 | Fails | Lc -45.5 | Large or bold text, headings |
| Black text on #63BDEA | 9.99:1 | AAA | Lc 63.0 | Content text, not long reading |
| #63BDEA text on white | 2.10:1 | Fails | Lc 40.9 | Non-text elements, placeholder text |
| #63BDEA text on black | 9.99:1 | AAA | Lc -61.4 | 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
#ECF7FE
oklch(97% 0.015 235.4)
-
Step 100
100
#D6EEFC
oklch(93.6% 0.032 233.3)
-
Step 200
200
#B2E1FA
oklch(88.5% 0.06 231.5)
-
Step 300
300 (this color)
#63BDEA
oklch(76% 0.108 232.3)
-
Step 400
400
#00AEEB
oklch(70.6% 0.145 232.7)
-
Step 500
500
#0095CA
oklch(63% 0.13 232.7)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#63BDEA 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) | #A7BBEC | 0.072 |
| Deuteranopia (no green cones) | #94ADE9 | 0.062 |
| Tritanopia (no blue cones) | #00C9CC | 0.075 |
| Achromatopsia (no color) | #B3B3B3 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BDEA
#63BDEA
oklch(76% 0.108 232.3)
- #E79D6F
#E79D6F
oklch(75.9% 0.108 52.3)
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 #63BDEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.033
- Lightblue #7BC8F6 ΔE 0.041
- Deep Sky Blue #00BFFF ΔE 0.046
- Bright Sky Blue #02CCFE ΔE 0.050
- Sky #82CAFC ΔE 0.052
- Carolina Blue #8AB8FE ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.060
- Sky Blue #87CEEB ΔE 0.061
Use #63BDEA 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.