#403757
Closest named color: Onyx (#343A40). oklch(36.1% 0.055 296.5), rgb(64, 55, 87).
Aa
White text reads best on this color (11.04:1).
About this color
#403757 is a dark, muted purple. In OKLCH its lightness is 36%, its chroma 0.055 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.050 away. White text reads best on it, at 11.04:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | muted (0.055) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.90:1 |
| White text | 11.04:1 |
Values
| HEX | #403757 |
| RGB | rgb(64, 55, 87) |
| HSL | hsl(257, 23%, 28%) |
| OKLCH | oklch(36.1% 0.055 296.5) |
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 #403757 | 11.04:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #403757 | 1.90:1 | Fails | Lc 8.4 | Not readable |
| #403757 text on white | 11.04:1 | AAA | Lc 95.5 | Preferred for body text |
| #403757 text on black | 1.90:1 | Fails | Lc 0.0 | 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
#F6F5F9
oklch(97.2% 0.005 297.7)
-
Step 100
100
#EAE8F1
oklch(93.5% 0.012 296.3)
-
Step 200
200
#DAD6E7
oklch(88.4% 0.023 296.7)
-
Step 300
300
#C3BCD9
oklch(81% 0.041 296.5)
-
Step 400
400
#A498C6
oklch(70.6% 0.067 296.6)
-
Step 500
500
#8E7FB7
oklch(63.1% 0.084 296.2)
-
Step 600
600
#7967A3
oklch(55.5% 0.093 297.1)
-
Step 700
700
#65568C
oklch(49.1% 0.086 295.9)
-
Step 800
800
#534671
oklch(42.6% 0.071 297.2)
-
Step 900
900 (this color)
#403757
oklch(36.1% 0.055 296.5)
-
Step 950
950
#282336
oklch(27.1% 0.035 296)
#403757 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) | #2F3C58 | 0.030 |
| Deuteranopia (no green cones) | #303C56 | 0.029 |
| Tritanopia (no blue cones) | #3B3C43 | 0.044 |
| Achromatopsia (no color) | #3C3C3C | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403757
#403757
oklch(36.1% 0.055 296.5)
- #3B411D
#3B411D
oklch(36% 0.056 117.1)
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 #403757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.056
- Gunmetal #293241 ΔE 0.058
- Charcoal #264653 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.060
Use #403757 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.