#6173CF
Closest named color: Dark Periwinkle (#665FD1). oklch(58.5% 0.142 272.9), rgb(97, 115, 207).
Aa
Black text reads best on this color (4.86:1).
About this color
#6173CF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.142 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.050 away. Black text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.86:1 |
| White text | 4.31:1 |
Values
| HEX | #6173CF |
| RGB | rgb(97, 115, 207) |
| HSL | hsl(230, 53%, 60%) |
| OKLCH | oklch(58.5% 0.142 272.9) |
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 #6173CF | 4.31:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #6173CF | 4.86:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #6173CF text on white | 4.31:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #6173CF text on black | 4.86:1 | AA | Lc -31.9 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BFEB
oklch(81% 0.064 273)
-
Step 400
400
#8B9CE1
oklch(70.7% 0.103 272.9)
-
Step 500
500
#7082D8
oklch(63.1% 0.131 273.2)
-
Step 600
600 (this color)
#6173CF
oklch(58.5% 0.142 272.9)
-
Step 700
700
#4958AA
oklch(49.1% 0.131 272.9)
-
Step 800
800
#3C488A
oklch(42.6% 0.11 273.1)
-
Step 900
900
#333D6E
oklch(37.7% 0.085 273)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#6173CF 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) | #4B7ED2 | 0.035 |
| Deuteranopia (no green cones) | #3F75CD | 0.037 |
| Tritanopia (no blue cones) | #2C8797 | 0.126 |
| Achromatopsia (no color) | #7A7A7A | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6173CF
#6173CF
oklch(58.5% 0.142 272.9)
- #947900
#947900
oklch(58.5% 0.12 93.2)
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 #6173CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.050
- Windows Blue #3778BF ΔE 0.053
- Royal Blue #4169E1 ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.061
- Light Indigo #6D5ACF ΔE 0.062
- Cornflower #6A79F7 ΔE 0.062
- Soft Blue #6488EA ΔE 0.064
- Medium Slate Blue #7B68EE ΔE 0.066
Use #6173CF 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.