#403D56
Closest named color: Dark Grey Blue (#29465B). oklch(37.4% 0.043 289.7), rgb(64, 61, 86).
Aa
White text reads best on this color (10.39:1).
About this color
#403D56 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.043 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.039 away. White text reads best on it, at 10.39:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.39:1 |
Values
| HEX | #403D56 |
| RGB | rgb(64, 61, 86) |
| HSL | hsl(247, 17%, 29%) |
| OKLCH | oklch(37.4% 0.043 289.7) |
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 #403D56 | 10.39:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #403D56 | 2.01:1 | Fails | Lc 9.8 | Not readable |
| #403D56 text on white | 10.39:1 | AAA | Lc 94.1 | Preferred for body text |
| #403D56 text on black | 2.01:1 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D7E4
oklch(88.4% 0.018 289.6)
-
Step 300
300
#C0BED4
oklch(81% 0.031 289.9)
-
Step 400
400
#9F9CBF
oklch(70.7% 0.051 289)
-
Step 500
500
#8883AF
oklch(63.1% 0.066 289.6)
-
Step 600
600
#726C9A
oklch(55.5% 0.071 289.9)
-
Step 700
700
#605A84
oklch(49.1% 0.067 290.3)
-
Step 800
800
#4E4A6B
oklch(42.7% 0.054 289.4)
-
Step 900
900 (this color)
#403D56
oklch(37.4% 0.043 289.7)
-
Step 950
950
#262433
oklch(26.9% 0.028 290.5)
#403D56 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) | #374057 | 0.016 |
| Deuteranopia (no green cones) | #373F55 | 0.016 |
| Tritanopia (no blue cones) | #3B4146 | 0.036 |
| Achromatopsia (no color) | #404040 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D56
#403D56
oklch(37.4% 0.043 289.7)
- #424328
#424328
oklch(37.4% 0.043 110.1)
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 #403D56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.042
- Onyx #343A40 ΔE 0.044
- Charcoal #264653 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.060
- Gunmetal #293241 ΔE 0.062
- Dark Slate Gray #2F4F4F ΔE 0.066
Use #403D56 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.