#63A3CF
Closest named color: Greyblue (#77A1B5). oklch(69% 0.093 240), rgb(99, 163, 207).
Aa
Black text reads best on this color (7.67:1).
About this color
#63A3CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.093 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.041 away. Black text reads best on it, at 7.67:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.67:1 |
| White text | 2.73:1 |
Values
| HEX | #63A3CF |
| RGB | rgb(99, 163, 207) |
| HSL | hsl(204, 53%, 60%) |
| OKLCH | oklch(69% 0.093 240) |
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 #63A3CF | 2.73:1 | Fails | Lc -58.1 | Large or bold text, headings |
| Black text on #63A3CF | 7.67:1 | AAA | Lc 51.2 | Large or bold text, headings |
| #63A3CF text on white | 2.73:1 | Fails | Lc 52.8 | Large or bold text, headings |
| #63A3CF text on black | 7.67:1 | AAA | Lc -49.0 | 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
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C7DDED
oklch(88.6% 0.032 239.4)
-
Step 300
300
#9FC6E3
oklch(80.8% 0.058 240.6)
-
Step 400
400 (this color)
#63A3CF
oklch(69% 0.093 240)
-
Step 500
500
#3992C9
oklch(63.1% 0.118 239.8)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557F
oklch(42.8% 0.098 239.8)
-
Step 900
900
#104666
oklch(37.7% 0.077 240.2)
-
Step 950
950
#0C293C
oklch(26.9% 0.049 240.9)
#63A3CF 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) | #8FA3D1 | 0.051 |
| Deuteranopia (no green cones) | #8197CE | 0.044 |
| Tritanopia (no blue cones) | #23AEB2 | 0.075 |
| Achromatopsia (no color) | #9C9C9C | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A3CF
#63A3CF
oklch(69% 0.093 240)
- #C68D5F
#C68D5F
oklch(68.9% 0.093 59.3)
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 #63A3CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.041
- Bluegrey #85A3B2 ΔE 0.054
- Bluey Grey #89A0B0 ΔE 0.058
- Cool Gray #8D99AE ΔE 0.063
- Turquoise Blue #06B1C4 ΔE 0.063
- Faded Blue #658CBB ΔE 0.064
- Cornflower Blue #6495ED ΔE 0.066
- Cadet Blue #5F9EA0 ΔE 0.070
Use #63A3CF 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.