#403F53
Closest named color: Charcoal Grey (#3C4142). oklch(37.7% 0.034 286.9), rgb(64, 63, 83).
Aa
White text reads best on this color (10.22:1).
About this color
#403F53 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.034 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.033 away. White text reads best on it, at 10.22:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #403F53 |
| RGB | rgb(64, 63, 83) |
| HSL | hsl(243, 14%, 29%) |
| OKLCH | oklch(37.7% 0.034 286.9) |
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 #403F53 | 10.22:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #403F53 | 2.05:1 | Fails | Lc 10.2 | Not readable |
| #403F53 text on white | 10.22:1 | AAA | Lc 93.7 | Preferred for body text |
| #403F53 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
#D8D8E2
oklch(88.5% 0.014 286.1)
-
Step 300
300
#BFBED1
oklch(80.8% 0.027 288.2)
-
Step 400
400
#9E9DB9
oklch(70.6% 0.041 286.9)
-
Step 500
500
#8785A8
oklch(63.1% 0.052 287.4)
-
Step 600
600
#716F93
oklch(55.7% 0.055 287)
-
Step 700
700
#5E5C7D
oklch(49% 0.052 287.1)
-
Step 800
800
#4D4C66
oklch(42.8% 0.043 286.2)
-
Step 900
900 (this color)
#403F53
oklch(37.7% 0.034 286.9)
-
Step 950
950
#252531
oklch(27% 0.022 284.8)
#403F53 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) | #3A4154 | 0.011 |
| Deuteranopia (no green cones) | #3A4052 | 0.010 |
| Tritanopia (no blue cones) | #3C4246 | 0.028 |
| Achromatopsia (no color) | #414141 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F53
#403F53
oklch(37.7% 0.034 286.9)
- #43432E
#43432E
oklch(37.7% 0.034 107.9)
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 #403F53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.040
- Onyx #343A40 ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.052
- Dark Slate Gray #2F4F4F ΔE 0.058
- Gunmetal #293241 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.065
Use #403F53 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.