#63A3CB
Closest named color: Greyblue (#77A1B5). oklch(68.8% 0.088 237.4), rgb(99, 163, 203).
Aa
Black text reads best on this color (7.63:1).
About this color
#63A3CB is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.088 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.036 away. Black text reads best on it, at 7.63:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.63:1 |
| White text | 2.75:1 |
Values
| HEX | #63A3CB |
| RGB | rgb(99, 163, 203) |
| HSL | hsl(203, 50%, 59%) |
| OKLCH | oklch(68.8% 0.088 237.4) |
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 #63A3CB | 2.75:1 | Fails | Lc -58.3 | Large or bold text, headings |
| Black text on #63A3CB | 7.63:1 | AAA | Lc 51.0 | Large or bold text, headings |
| #63A3CB text on white | 2.75:1 | Fails | Lc 53.0 | Large or bold text, headings |
| #63A3CB text on black | 7.63:1 | AAA | Lc -48.8 | 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
#A0C7E0
oklch(81% 0.055 236.5)
-
Step 400
400 (this color)
#63A3CB
oklch(68.8% 0.088 237.4)
-
Step 500
500
#3993C5
oklch(63.2% 0.113 237)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#104764
oklch(37.8% 0.074 237.1)
-
Step 950
950
#0C2A3A
oklch(27.1% 0.046 235.5)
#63A3CB 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) | #91A2CD | 0.053 |
| Deuteranopia (no green cones) | #8297CA | 0.045 |
| Tritanopia (no blue cones) | #29ADB0 | 0.070 |
| Achromatopsia (no color) | #9C9C9C | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A3CB
#63A3CB
oklch(68.8% 0.088 237.4)
- #C58D63
#C58D63
oklch(68.9% 0.089 57.5)
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 #63A3CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.036
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.054
- Cool Gray #8D99AE ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.060
- Faded Blue #658CBB ΔE 0.063
- Cadet Blue #5F9EA0 ΔE 0.064
- Silver Lake Blue #778DA9 ΔE 0.068
Use #63A3CB 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.