#63ACEE
Closest named color: Carolina Blue (#8AB8FE). oklch(72.4% 0.121 247.6), rgb(99, 172, 238).
Aa
Black text reads best on this color (8.66:1).
About this color
#63ACEE is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.121 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.058 away. Black text reads best on it, at 8.66:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.66:1 |
| White text | 2.42:1 |
Values
| HEX | #63ACEE |
| RGB | rgb(99, 172, 238) |
| HSL | hsl(208, 80%, 66%) |
| OKLCH | oklch(72.4% 0.121 247.6) |
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 #63ACEE | 2.42:1 | Fails | Lc -52.5 | Large or bold text, headings |
| Black text on #63ACEE | 8.66:1 | AAA | Lc 56.5 | Large or bold text, headings |
| #63ACEE text on white | 2.42:1 | Fails | Lc 47.5 | Large or bold text, headings |
| #63ACEE text on black | 8.66:1 | AAA | Lc -54.5 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9AC6F0
oklch(81% 0.076 247.6)
-
Step 400
400 (this color)
#63ACEE
oklch(72.4% 0.121 247.6)
-
Step 500
500
#228EE1
oklch(63% 0.155 247.7)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#062844
oklch(27% 0.065 248)
#63ACEE 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) | #90AEF1 | 0.050 |
| Deuteranopia (no green cones) | #7DA0ED | 0.039 |
| Tritanopia (no blue cones) | #00BCC3 | 0.099 |
| Achromatopsia (no color) | #A6A6A6 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63ACEE
#63ACEE
oklch(72.4% 0.121 247.6)
- #D8964A
#D8964A
oklch(72.4% 0.122 67.5)
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 #63ACEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.059
- Cornflower Blue #6495ED ΔE 0.062
- Chefchaouen Blue #4895EF ΔE 0.071
- Periwinkle Blue #8F99FB ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Lightblue #7BC8F6 ΔE 0.082
- Greyblue #77A1B5 ΔE 0.082
Use #63ACEE 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.