#403E51
Closest named color: Charcoal Grey (#3C4142). oklch(37.4% 0.032 289.6), rgb(64, 62, 81).
Aa
White text reads best on this color (10.36:1).
About this color
#403E51 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.032 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.032 away. White text reads best on it, at 10.36:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #403E51 |
| RGB | rgb(64, 62, 81) |
| HSL | hsl(246, 13%, 28%) |
| OKLCH | oklch(37.4% 0.032 289.6) |
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 #403E51 | 10.36:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #403E51 | 2.02:1 | Fails | Lc 9.8 | Not readable |
| #403E51 text on white | 10.36:1 | AAA | Lc 94.1 | Preferred for body text |
| #403E51 text on black | 2.02:1 | Fails | Lc -8.5 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9E9EE
oklch(93.5% 0.007 286.3)
-
Step 200
200
#D9D8E2
oklch(88.6% 0.014 290.7)
-
Step 300
300
#C0BED0
oklch(80.9% 0.025 290.9)
-
Step 400
400
#9F9DB8
oklch(70.7% 0.039 288.8)
-
Step 500
500
#8885A6
oklch(63.1% 0.049 289.1)
-
Step 600
600
#726E91
oklch(55.5% 0.054 289.8)
-
Step 700
700
#605C7C
oklch(49.1% 0.051 290.1)
-
Step 800
800
#4E4B65
oklch(42.6% 0.043 289.7)
-
Step 900
900 (this color)
#403E51
oklch(37.4% 0.032 289.6)
-
Step 950
950
#262530
oklch(27% 0.02 289.1)
#403E51 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) | #3A4052 | 0.011 |
| Deuteranopia (no green cones) | #394050 | 0.013 |
| Tritanopia (no blue cones) | #3D4144 | 0.028 |
| Achromatopsia (no color) | #404040 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E51
#403E51
oklch(37.4% 0.032 289.6)
- #42422E
#42422E
oklch(37.3% 0.032 107.9)
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 #403E51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.032
- Onyx #343A40 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.059
- Gunmetal #293241 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.064
Use #403E51 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.