#6375C5
Closest named color: Windows Blue (#3778BF). oklch(58.5% 0.124 272.5), rgb(99, 117, 197).
Aa
Black text reads best on this color (4.88:1).
About this color
#6375C5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.124 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.048 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.88:1 |
| White text | 4.30:1 |
Values
| HEX | #6375C5 |
| RGB | rgb(99, 117, 197) |
| HSL | hsl(229, 46%, 58%) |
| OKLCH | oklch(58.5% 0.124 272.5) |
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 #6375C5 | 4.30:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #6375C5 | 4.88:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #6375C5 text on white | 4.30:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #6375C5 text on black | 4.88:1 | AA | Lc -32.0 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B4BFE6
oklch(80.9% 0.056 272.7)
-
Step 400
400
#8D9DD9
oklch(70.6% 0.09 272.4)
-
Step 500
500
#7284CF
oklch(63.1% 0.115 272.5)
-
Step 600
600 (this color)
#6375C5
oklch(58.5% 0.124 272.5)
-
Step 700
700
#4B5AA2
oklch(49.1% 0.116 272.6)
-
Step 800
800
#3D4A83
oklch(42.7% 0.096 272.1)
-
Step 900
900
#343E69
oklch(37.6% 0.075 272.4)
-
Step 950
950
#1F253E
oklch(27.2% 0.047 272.6)
#6375C5 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) | #557EC8 | 0.027 |
| Deuteranopia (no green cones) | #4C76C3 | 0.027 |
| Tritanopia (no blue cones) | #3B8693 | 0.111 |
| Achromatopsia (no color) | #7A7A7A | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6375C5
#6375C5
oklch(58.5% 0.124 272.5)
- #957900
#957900
oklch(58.6% 0.12 92.6)
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 #6375C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.056
- Steel Blue #4682B4 ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.061
- French Blue #436BAD ΔE 0.061
- Off Blue #5684AE ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.066
- Dusty Blue #5A86AD ΔE 0.068
Use #6375C5 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.