#6375C8
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.129 272.6), rgb(99, 117, 200).
Aa
Black text reads best on this color (4.90:1).
About this color
#6375C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.129 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.049 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.90:1 |
| White text | 4.27:1 |
Values
| HEX | #6375C8 |
| RGB | rgb(99, 117, 200) |
| HSL | hsl(229, 48%, 59%) |
| OKLCH | oklch(58.6% 0.129 272.6) |
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 #6375C8 | 4.27:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #6375C8 | 4.90:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #6375C8 text on white | 4.27:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #6375C8 text on black | 4.90:1 | AA | Lc -32.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE7
oklch(81% 0.058 273)
-
Step 400
400
#8D9DDB
oklch(70.7% 0.093 272.7)
-
Step 500
500
#7284D1
oklch(63.2% 0.118 272.7)
-
Step 600
600 (this color)
#6375C8
oklch(58.6% 0.129 272.6)
-
Step 700
700
#4B5AA4
oklch(49.2% 0.119 272.7)
-
Step 800
800
#3D4A85
oklch(42.8% 0.099 272.3)
-
Step 900
900
#343E6A
oklch(37.7% 0.076 272.6)
-
Step 950
950
#1E243E
oklch(26.8% 0.049 272.8)
#6375C8 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) | #547FCB | 0.029 |
| Deuteranopia (no green cones) | #4976C6 | 0.030 |
| Tritanopia (no blue cones) | #388795 | 0.115 |
| Achromatopsia (no color) | #7A7A7A | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6375C8
#6375C8
oklch(58.6% 0.129 272.6)
- #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 #6375C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.049
- Cool Blue #4984B8 ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- French Blue #436BAD ΔE 0.064
- Soft Blue #6488EA ΔE 0.066
- Off Blue #5684AE ΔE 0.066
- Royal Blue #4169E1 ΔE 0.067
Use #6375C8 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.