#63A4CC
Closest named color: Greyblue (#77A1B5). oklch(69.1% 0.089 237), rgb(99, 164, 204).
Aa
Black text reads best on this color (7.71:1).
About this color
#63A4CC is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.089 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.037 away. Black text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.71:1 |
| White text | 2.72:1 |
Values
| HEX | #63A4CC |
| RGB | rgb(99, 164, 204) |
| HSL | hsl(203, 51%, 59%) |
| OKLCH | oklch(69.1% 0.089 237) |
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 #63A4CC | 2.72:1 | Fails | Lc -57.8 | Large or bold text, headings |
| Black text on #63A4CC | 7.71:1 | AAA | Lc 51.4 | Large or bold text, headings |
| #63A4CC text on white | 2.72:1 | Fails | Lc 52.6 | Large or bold text, headings |
| #63A4CC text on black | 7.71:1 | AAA | Lc -49.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEB
oklch(88.6% 0.03 235.7)
-
Step 300
300
#9FC7E0
oklch(80.9% 0.055 235.8)
-
Step 400
400 (this color)
#63A4CC
oklch(69.1% 0.089 237)
-
Step 500
500
#3893C5
oklch(63.1% 0.113 236.8)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#0F4764
oklch(37.8% 0.074 236.9)
-
Step 950
950
#0C2A3A
oklch(27.1% 0.046 235.5)
#63A4CC 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) | #92A3CE | 0.054 |
| Deuteranopia (no green cones) | #8398CB | 0.045 |
| Tritanopia (no blue cones) | #27AEB1 | 0.070 |
| Achromatopsia (no color) | #9D9D9D | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A4CC
#63A4CC
oklch(69.1% 0.089 237)
- #C68D64
#C68D64
oklch(69% 0.089 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 #63A4CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.037
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.059
- Cool Gray #8D99AE ΔE 0.061
- Cadet Blue #5F9EA0 ΔE 0.065
- Faded Blue #658CBB ΔE 0.066
- Cool Steel #97A7B3 ΔE 0.070
Use #63A4CC 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.