#403F54
Closest named color: Charcoal Grey (#3C4142). oklch(37.7% 0.036 286.7), rgb(64, 63, 84).
Aa
White text reads best on this color (10.20:1).
About this color
#403F54 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.036 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.035 away. White text reads best on it, at 10.20:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.05:1 |
| White text | 10.20:1 |
Values
| HEX | #403F54 |
| RGB | rgb(64, 63, 84) |
| HSL | hsl(243, 14%, 29%) |
| OKLCH | oklch(37.7% 0.036 286.7) |
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 #403F54 | 10.20:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #403F54 | 2.05:1 | Fails | Lc 10.2 | Not readable |
| #403F54 text on white | 10.20:1 | AAA | Lc 93.7 | Preferred for body text |
| #403F54 text on black | 2.05:1 | Fails | Lc -8.8 | 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
#E9E9EF
oklch(93.6% 0.008 286.2)
-
Step 200
200
#D8D8E3
oklch(88.5% 0.015 286.1)
-
Step 300
300
#BFBED2
oklch(80.9% 0.028 288.1)
-
Step 400
400
#9E9DBB
oklch(70.7% 0.043 286.8)
-
Step 500
500
#8785AA
oklch(63.2% 0.055 287.2)
-
Step 600
600
#706E95
oklch(55.5% 0.06 286.6)
-
Step 700
700
#5E5C7F
oklch(49.1% 0.056 286.8)
-
Step 800
800
#4D4B67
oklch(42.6% 0.046 287.5)
-
Step 900
900 (this color)
#403F54
oklch(37.7% 0.036 286.7)
-
Step 950
950
#252531
oklch(27% 0.022 284.8)
#403F54 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) | #3A4255 | 0.012 |
| Deuteranopia (no green cones) | #394053 | 0.012 |
| Tritanopia (no blue cones) | #3C4346 | 0.032 |
| Achromatopsia (no color) | #414141 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F54
#403F54
oklch(37.7% 0.036 286.7)
- #44432D
#44432D
oklch(37.7% 0.035 105.8)
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 #403F54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.041
- Onyx #343A40 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.052
- Dark Slate Gray #2F4F4F ΔE 0.058
- Gunmetal #293241 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.064
Use #403F54 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.