#403A55
Closest named color: Onyx (#343A40). oklch(36.6% 0.046 294.2), rgb(64, 58, 85).
Aa
White text reads best on this color (10.74:1).
About this color
#403A55 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.046 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.044 away. White text reads best on it, at 10.74:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.046) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #403A55 |
| RGB | rgb(64, 58, 85) |
| HSL | hsl(253, 19%, 28%) |
| OKLCH | oklch(36.6% 0.046 294.2) |
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 #403A55 | 10.74:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #403A55 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #403A55 text on white | 10.74:1 | AAA | Lc 94.9 | Preferred for body text |
| #403A55 text on black | 1.95:1 | Fails | Lc -7.7 | 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
#EAE9F0
oklch(93.7% 0.009 292.8)
-
Step 200
200
#D9D7E5
oklch(88.5% 0.019 292.6)
-
Step 300
300
#C1BDD5
oklch(80.9% 0.034 293.3)
-
Step 400
400
#A29AC1
oklch(70.6% 0.057 294.3)
-
Step 500
500
#8C81B1
oklch(63.1% 0.072 294.8)
-
Step 600
600
#766A9C
oklch(55.5% 0.077 294.8)
-
Step 700
700
#635986
oklch(49.2% 0.072 293.8)
-
Step 800
800
#51496D
oklch(42.9% 0.059 293.9)
-
Step 900
900 (this color)
#403A55
oklch(36.6% 0.046 294.2)
-
Step 950
950
#272434
oklch(27.1% 0.03 292.9)
#403A55 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) | #343E56 | 0.022 |
| Deuteranopia (no green cones) | #343D54 | 0.021 |
| Tritanopia (no blue cones) | #3C3E44 | 0.037 |
| Achromatopsia (no color) | #3E3E3E | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403A55
#403A55
oklch(36.6% 0.046 294.2)
- #3E4224
#3E4224
oklch(36.7% 0.048 115)
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 #403A55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.046
- Charcoal #264653 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.057
- Gunmetal #293241 ΔE 0.058
- Space Cadet #2B2D42 ΔE 0.063
Use #403A55 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.