#403B6B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.1% 0.08 286.7), rgb(64, 59, 107).
Aa
White text reads best on this color (10.21:1).
About this color
#403B6B is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.080 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.056 away. White text reads best on it, at 10.21:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #403B6B |
| RGB | rgb(64, 59, 107) |
| HSL | hsl(246, 29%, 33%) |
| OKLCH | oklch(38.1% 0.08 286.7) |
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 #403B6B | 10.21:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #403B6B | 2.05:1 | Fails | Lc 10.3 | Not readable |
| #403B6B text on white | 10.21:1 | AAA | Lc 93.6 | Preferred for body text |
| #403B6B text on black | 2.05:1 | Fails | Lc -8.9 | 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 900.
-
Step 50
50
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F5
oklch(93.6% 0.017 289.6)
-
Step 200
200
#D7D6EF
oklch(88.5% 0.034 287.5)
-
Step 300
300
#BDBBE6
oklch(80.8% 0.06 287.1)
-
Step 400
400
#9C97DA
oklch(70.6% 0.097 287)
-
Step 500
500
#857DD0
oklch(63.2% 0.123 286.7)
-
Step 600
600
#6F64BD
oklch(55.5% 0.135 286.8)
-
Step 700
700
#5D53A3
oklch(49.1% 0.124 286.6)
-
Step 800
800
#4C4484
oklch(42.7% 0.103 286.9)
-
Step 900
900 (this color)
#403B6B
oklch(38.1% 0.08 286.7)
-
Step 950
950
#25223E
oklch(27% 0.051 287.4)
#403B6B 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) | #2B426D | 0.034 |
| Deuteranopia (no green cones) | #2A406A | 0.034 |
| Tritanopia (no blue cones) | #34444D | 0.069 |
| Achromatopsia (no color) | #414141 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B6B
#403B6B
oklch(38.1% 0.08 286.7)
- #484502
#484502
oklch(38.1% 0.08 106.8)
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 #403B6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.058
- Twilight Blue #0A437A ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.066
- Charcoal #264653 ΔE 0.070
- Marine Blue #01386A ΔE 0.071
- Blueberry #464196 ΔE 0.073
- Cobalt #1E488F ΔE 0.073
Use #403B6B 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.