#403B71
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.09 285.6), rgb(64, 59, 113).
Aa
White text reads best on this color (10.08:1).
About this color
#403B71 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.090 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.08:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.08:1 |
Values
| HEX | #403B71 |
| RGB | rgb(64, 59, 113) |
| HSL | hsl(246, 31%, 34%) |
| OKLCH | oklch(38.5% 0.09 285.6) |
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 #403B71 | 10.08:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #403B71 | 2.08:1 | Fails | Lc 10.6 | Not readable |
| #403B71 text on white | 10.08:1 | AAA | Lc 93.3 | Preferred for body text |
| #403B71 text on black | 2.08:1 | Fails | Lc -9.2 | 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 900.
-
Step 50
50
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D6D6F2
oklch(88.5% 0.038 285.6)
-
Step 300
300
#BCBBEB
oklch(80.9% 0.067 285.7)
-
Step 400
400
#9A97E1
oklch(70.8% 0.107 285.2)
-
Step 500
500
#837BD8
oklch(63.1% 0.137 285.7)
-
Step 600
600
#6D62C6
oklch(55.6% 0.15 285.4)
-
Step 700
700
#5C51AB
oklch(49.2% 0.139 285.7)
-
Step 800
800
#4B438A
oklch(42.8% 0.114 285.7)
-
Step 900
900 (this color)
#403B71
oklch(38.5% 0.09 285.6)
-
Step 950
950
#242241
oklch(27.1% 0.057 284.9)
#403B71 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) | #274373 | 0.039 |
| Deuteranopia (no green cones) | #254070 | 0.039 |
| Tritanopia (no blue cones) | #324650 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B71
#403B71
oklch(38.5% 0.09 285.6)
- #4A4600
#4A4600
oklch(38.6% 0.082 105.9)
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 #403B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.059
- Blueberry #464196 ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.064
- Cobalt #1E488F ΔE 0.066
- Light Navy #155084 ΔE 0.072
- Marine Blue #01386A ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.072
Use #403B71 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.