#6376CB
Closest named color: Windows Blue (#3778BF). oklch(59% 0.132 272.3), rgb(99, 118, 203).
Aa
Black text reads best on this color (4.98:1).
About this color
#6376CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.132 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.051 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #6376CB |
| RGB | rgb(99, 118, 203) |
| HSL | hsl(229, 50%, 59%) |
| OKLCH | oklch(59% 0.132 272.3) |
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 #6376CB | 4.21:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #6376CB | 4.98:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #6376CB text on white | 4.21:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #6376CB text on black | 4.98:1 | AA | Lc -32.7 | 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
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B3BFE8
oklch(80.9% 0.06 272.2)
-
Step 400
400
#8C9DDC
oklch(70.7% 0.095 272.2)
-
Step 500
500
#7083D3
oklch(63% 0.123 272.3)
-
Step 600
600 (this color)
#6376CB
oklch(59% 0.132 272.3)
-
Step 700
700
#4A59A5
oklch(49% 0.122 272.7)
-
Step 800
800
#3C4986
oklch(42.6% 0.102 272.3)
-
Step 900
900
#333E6B
oklch(37.7% 0.078 271.8)
-
Step 950
950
#1E243F
oklch(26.9% 0.051 273)
#6376CB 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) | #5380CE | 0.030 |
| Deuteranopia (no green cones) | #4877C9 | 0.031 |
| Tritanopia (no blue cones) | #358897 | 0.116 |
| Achromatopsia (no color) | #7B7B7B | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6376CB
#6376CB
oklch(59% 0.132 272.3)
- #977A00
#977A00
oklch(59% 0.121 92.1)
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 #6376CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.051
- Cool Blue #4984B8 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.060
- Soft Blue #6488EA ΔE 0.061
- Steel Blue #4682B4 ΔE 0.062
- Royal Blue #4169E1 ΔE 0.066
- Cornflower #6A79F7 ΔE 0.067
- Off Blue #5684AE ΔE 0.068
Use #6376CB 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.