#403771
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.096 288), rgb(64, 55, 113).
Aa
White text reads best on this color (10.48:1).
About this color
#403771 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.096 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.047 away. White text reads best on it, at 10.48:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #403771 |
| RGB | rgb(64, 55, 113) |
| HSL | hsl(249, 35%, 33%) |
| OKLCH | oklch(37.7% 0.096 288) |
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 #403771 | 10.48:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #403771 | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #403771 text on white | 10.48:1 | AAA | Lc 94.2 | Preferred for body text |
| #403771 text on black | 2.00:1 | Fails | Lc -8.4 | 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
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D7D6F3
oklch(88.6% 0.04 287.1)
-
Step 300
300
#BEBAED
oklch(80.9% 0.072 288.3)
-
Step 400
400
#9D94E4
oklch(70.6% 0.116 288.2)
-
Step 500
500
#8678DD
oklch(63.1% 0.148 287.7)
-
Step 600
600
#715FCA
oklch(55.6% 0.16 287.8)
-
Step 700
700
#5F4DAF
oklch(49% 0.15 288)
-
Step 800
800
#4E408E
oklch(42.8% 0.124 288.2)
-
Step 900
900 (this color)
#403771
oklch(37.7% 0.096 288)
-
Step 950
950
#252142
oklch(27% 0.06 287.2)
#403771 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) | #204173 | 0.048 |
| Deuteranopia (no green cones) | #1F3E70 | 0.048 |
| Tritanopia (no blue cones) | #32434E | 0.081 |
| Achromatopsia (no color) | #3F3F3F | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403771
#403771
oklch(37.7% 0.096 288)
- #464400
#464400
oklch(37.6% 0.081 107.8)
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 #403771, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.063
- Blueberry #464196 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.071
- Marine Blue #01386A ΔE 0.071
- Cobalt #1E488F ΔE 0.072
- Dark Grey Blue #29465B ΔE 0.072
- Light Navy #155084 ΔE 0.081
Use #403771 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.