#6173CC
Closest named color: Windows Blue (#3778BF). oklch(58.3% 0.138 272.8), rgb(97, 115, 204).
Aa
Black text reads best on this color (4.83:1).
About this color
#6173CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.138 and its hue 273°. 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 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.83:1 |
| White text | 4.34:1 |
Values
| HEX | #6173CC |
| RGB | rgb(97, 115, 204) |
| HSL | hsl(230, 51%, 59%) |
| OKLCH | oklch(58.3% 0.138 272.8) |
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 #6173CC | 4.34:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #6173CC | 4.83:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #6173CC text on white | 4.34:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #6173CC text on black | 4.83:1 | AA | Lc -31.7 | 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
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BFE9
oklch(81% 0.061 272.5)
-
Step 400
400
#8C9CDF
oklch(70.6% 0.1 273.3)
-
Step 500
500
#7083D6
oklch(63.2% 0.127 272.6)
-
Step 600
600 (this color)
#6173CC
oklch(58.3% 0.138 272.8)
-
Step 700
700
#4A59A8
oklch(49.2% 0.127 272.8)
-
Step 800
800
#3C4988
oklch(42.7% 0.105 272.5)
-
Step 900
900
#333D6D
oklch(37.6% 0.083 272.9)
-
Step 950
950
#1E2440
oklch(27% 0.053 273.2)
#6173CC 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) | #4D7ECF | 0.034 |
| Deuteranopia (no green cones) | #4275CA | 0.035 |
| Tritanopia (no blue cones) | #2F8695 | 0.123 |
| Achromatopsia (no color) | #797979 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6173CC
#6173CC
oklch(58.3% 0.138 272.8)
- #947800
#947800
oklch(58.3% 0.119 92.5)
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 #6173CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.063
- French Blue #436BAD ΔE 0.065
- Cool Blue #4984B8 ΔE 0.065
- Soft Blue #6488EA ΔE 0.066
Use #6173CC 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.