#403C6E
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.083 285.4), rgb(64, 60, 110).
Aa
White text reads best on this color (10.05:1).
About this color
#403C6E is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.083 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.05:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #403C6E |
| RGB | rgb(64, 60, 110) |
| HSL | hsl(245, 29%, 33%) |
| OKLCH | oklch(38.5% 0.083 285.4) |
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 #403C6E | 10.05:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #403C6E | 2.08:1 | Fails | Lc 10.7 | Not readable |
| #403C6E text on white | 10.05:1 | AAA | Lc 93.2 | Preferred for body text |
| #403C6E text on black | 2.08:1 | Fails | Lc -9.3 | 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
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D6F0
oklch(88.4% 0.036 285.7)
-
Step 300
300
#BCBCE8
oklch(81% 0.062 284.9)
-
Step 400
400
#9A98DD
oklch(70.8% 0.1 284.9)
-
Step 500
500
#837DD3
oklch(63.2% 0.127 285.3)
-
Step 600
600
#6D64C0
oklch(55.5% 0.139 285.4)
-
Step 700
700
#5B53A6
oklch(49.2% 0.129 285)
-
Step 800
800
#4B4486
oklch(42.7% 0.106 285.8)
-
Step 900
900 (this color)
#403C6E
oklch(38.5% 0.083 285.4)
-
Step 950
950
#24223F
oklch(27% 0.053 285.4)
#403C6E 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) | #2A4370 | 0.035 |
| Deuteranopia (no green cones) | #29416D | 0.035 |
| Tritanopia (no blue cones) | #33464F | 0.072 |
| Achromatopsia (no color) | #424242 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403C6E
#403C6E
oklch(38.5% 0.083 285.4)
- #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 #403C6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.059
- Twilight Blue #0A437A ΔE 0.059
- Blueberry #464196 ΔE 0.068
- Cobalt #1E488F ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.070
- Light Navy #155084 ΔE 0.072
- Marine Blue #01386A ΔE 0.072
Use #403C6E 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.