#673B71
Closest named color: Dark Slate Blue (#483D8B). oklch(42.8% 0.1 320), rgb(103, 59, 113).
Aa
White text reads best on this color (8.60:1).
About this color
#673B71 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.100 and its hue 320°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.071 away. White text reads best on it, at 8.60:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.100) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #673B71 |
| RGB | rgb(103, 59, 113) |
| HSL | hsl(289, 31%, 34%) |
| OKLCH | oklch(42.8% 0.1 320) |
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 #673B71 | 8.60:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #673B71 | 2.44:1 | Fails | Lc 14.7 | Not readable |
| #673B71 text on white | 8.60:1 | AAA | Lc 89.3 | Fine for body text |
| #673B71 text on black | 2.44:1 | Fails | Lc -12.9 | Not readable |
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 800.
-
Step 50
50
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EFE6F1
oklch(93.5% 0.018 320.1)
-
Step 200
200
#E3D3E7
oklch(88.6% 0.032 319.5)
-
Step 300
300
#D2B5D9
oklch(80.9% 0.059 319.7)
-
Step 400
400
#BB8EC5
oklch(70.8% 0.093 320.1)
-
Step 500
500
#A970B6
oklch(63% 0.12 320)
-
Step 600
600
#9457A2
oklch(55.5% 0.13 319.9)
-
Step 700
700
#7E478B
oklch(49.1% 0.121 319.7)
-
Step 800
800 (this color)
#673B71
oklch(42.8% 0.1 320)
-
Step 900
900
#54335B
oklch(37.8% 0.078 320.4)
-
Step 950
950
#311E35
oklch(27% 0.049 320.5)
#673B71 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) | #334973 | 0.090 |
| Deuteranopia (no green cones) | #3F4E6F | 0.082 |
| Tritanopia (no blue cones) | #684250 | 0.064 |
| Achromatopsia (no color) | #4C4C4C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #673B71
#673B71
oklch(42.8% 0.1 320)
- #2E5C24
#2E5C24
oklch(42.8% 0.1 140.2)
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 #673B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.071
- Rebecca Purple #663399 ΔE 0.071
- Brownish Purple #76424E ΔE 0.074
- Twilight #4E518B ΔE 0.074
- Dusk #4E5481 ΔE 0.075
- Light Eggplant #894585 ΔE 0.077
- Dusty Grape #545775 ΔE 0.080
- Purple Brown #673A3F ΔE 0.084
Use #673B71 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.