#6173BF
Closest named color: Windows Blue (#3778BF). oklch(57.6% 0.119 272.1), rgb(97, 115, 191).
Aa
Black text reads best on this color (4.71:1).
About this color
#6173BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.119 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.044 away. Black text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.71:1 |
| White text | 4.45:1 |
Values
| HEX | #6173BF |
| RGB | rgb(97, 115, 191) |
| HSL | hsl(229, 42%, 56%) |
| OKLCH | oklch(57.6% 0.119 272.1) |
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 #6173BF | 4.45:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #6173BF | 4.71:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #6173BF text on white | 4.45:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #6173BF text on black | 4.71:1 | AA | Lc -30.9 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B4BFE4
oklch(80.8% 0.054 272.1)
-
Step 400
400
#8E9ED7
oklch(70.8% 0.086 272)
-
Step 500
500
#7385CC
oklch(63.2% 0.109 272.1)
-
Step 600
600 (this color)
#6173BF
oklch(57.6% 0.119 272.1)
-
Step 700
700
#4B5B9F
oklch(49.1% 0.11 271.8)
-
Step 800
800
#3E4A81
oklch(42.6% 0.092 272.6)
-
Step 900
900
#343F67
oklch(37.8% 0.07 271.1)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#6173BF 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) | #557CC2 | 0.026 |
| Deuteranopia (no green cones) | #4C74BD | 0.025 |
| Tritanopia (no blue cones) | #3B8390 | 0.106 |
| Achromatopsia (no color) | #777777 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6173BF
#6173BF
oklch(57.6% 0.119 272.1)
- #927600
#927600
oklch(57.6% 0.118 92.2)
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 #6173BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.044
- French Blue #436BAD ΔE 0.052
- Steel Blue #4682B4 ΔE 0.055
- Cool Blue #4984B8 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.057
- Off Blue #5684AE ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
- Dull Blue #49759C ΔE 0.066
Use #6173BF 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.