#403C57
Closest named color: Dark Grey Blue (#29465B). oklch(37.2% 0.046 290.8), rgb(64, 60, 87).
Aa
White text reads best on this color (10.48:1).
About this color
#403C57 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.046 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.041 away. White text reads best on it, at 10.48:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.046) |
| Temperature | in between |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #403C57 |
| RGB | rgb(64, 60, 87) |
| HSL | hsl(249, 18%, 29%) |
| OKLCH | oklch(37.2% 0.046 290.8) |
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 #403C57 | 10.48:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #403C57 | 2.00:1 | Fails | Lc 9.6 | Not readable |
| #403C57 text on white | 10.48:1 | AAA | Lc 94.3 | Preferred for body text |
| #403C57 text on black | 2.00:1 | Fails | Lc -8.2 | 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
#D9D7E5
oklch(88.5% 0.019 292.6)
-
Step 300
300
#C0BDD6
oklch(80.9% 0.035 291.1)
-
Step 400
400
#A09BC1
oklch(70.7% 0.055 290.9)
-
Step 500
500
#8982B1
oklch(63% 0.07 291.1)
-
Step 600
600
#736B9D
oklch(55.5% 0.077 291)
-
Step 700
700
#615986
oklch(49% 0.071 291.7)
-
Step 800
800
#4F496D
oklch(42.7% 0.059 291.3)
-
Step 900
900 (this color)
#403C57
oklch(37.2% 0.046 290.8)
-
Step 950
950
#262434
oklch(27% 0.03 290)
#403C57 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) | #354058 | 0.020 |
| Deuteranopia (no green cones) | #353F56 | 0.019 |
| Tritanopia (no blue cones) | #3B4146 | 0.039 |
| Achromatopsia (no color) | #3F3F3F | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403C57
#403C57
oklch(37.2% 0.046 290.8)
- #414325
#414325
oklch(37.3% 0.047 111.8)
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 #403C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.045
- Onyx #343A40 ΔE 0.046
- Charcoal #264653 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.059
- Gunmetal #293241 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.068
Use #403C57 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.