#403C51
Closest named color: Charcoal Grey (#3C4142). oklch(36.9% 0.036 293.3), rgb(64, 60, 81).
Aa
White text reads best on this color (10.58:1).
About this color
#403C51 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.036 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.036 away. White text reads best on it, at 10.58:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.036) |
| Temperature | in between |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.98:1 |
| White text | 10.58:1 |
Values
| HEX | #403C51 |
| RGB | rgb(64, 60, 81) |
| HSL | hsl(251, 15%, 28%) |
| OKLCH | oklch(36.9% 0.036 293.3) |
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 #403C51 | 10.58:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #403C51 | 1.98:1 | Fails | Lc 9.3 | Not readable |
| #403C51 text on white | 10.58:1 | AAA | Lc 94.6 | Preferred for body text |
| #403C51 text on black | 1.98:1 | Fails | Lc -8.0 | 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
#EAE9EF
oklch(93.7% 0.008 293.9)
-
Step 200
200
#D9D7E2
oklch(88.4% 0.015 294.4)
-
Step 300
300
#C1BED1
oklch(81% 0.027 293)
-
Step 400
400
#A19CBA
oklch(70.7% 0.044 292.9)
-
Step 500
500
#8A84A8
oklch(63.1% 0.054 292.4)
-
Step 600
600
#746D94
oklch(55.6% 0.06 292.6)
-
Step 700
700
#625B7E
oklch(49.2% 0.056 293.4)
-
Step 800
800
#504A66
oklch(42.6% 0.046 294.2)
-
Step 900
900 (this color)
#403C51
oklch(36.9% 0.036 293.3)
-
Step 950
950
#272431
oklch(26.9% 0.024 295.3)
#403C51 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) | #373F52 | 0.016 |
| Deuteranopia (no green cones) | #383E50 | 0.014 |
| Tritanopia (no blue cones) | #3D3F43 | 0.030 |
| Achromatopsia (no color) | #3F3F3F | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403C51
#403C51
oklch(36.9% 0.036 293.3)
- #3F422B
#3F422B
oklch(36.9% 0.037 114.3)
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 #403C51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.036
- Onyx #343A40 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.049
- Gunmetal #293241 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.065
Use #403C51 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.