#403E7F
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.107 281.8), rgb(64, 62, 127).
Aa
White text reads best on this color (9.48:1).
About this color
#403E7F is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.024 away. White text reads best on it, at 9.48:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #403E7F |
| RGB | rgb(64, 62, 127) |
| HSL | hsl(242, 34%, 37%) |
| OKLCH | oklch(40.1% 0.107 281.8) |
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 #403E7F | 9.48:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #403E7F | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #403E7F text on white | 9.48:1 | AAA | Lc 91.8 | Preferred for body text |
| #403E7F text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F7
oklch(88.5% 0.045 282.7)
-
Step 300
300
#B8BBF4
oklch(81% 0.08 282.1)
-
Step 400
400
#9496EE
oklch(70.8% 0.128 281.6)
-
Step 500
500
#7C79E8
oklch(63.1% 0.163 281.9)
-
Step 600
600
#675FD6
oklch(55.6% 0.177 282)
-
Step 700
700
#564DBA
oklch(49.1% 0.166 282.1)
-
Step 800
800
#464096
oklch(42.7% 0.136 282.1)
-
Step 900
900 (this color)
#403E7F
oklch(40.1% 0.107 281.8)
-
Step 950
950
#222146
oklch(27% 0.067 282.1)
#403E7F 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) | #214881 | 0.044 |
| Deuteranopia (no green cones) | #1C437E | 0.045 |
| Tritanopia (no blue cones) | #2A4C58 | 0.092 |
| Achromatopsia (no color) | #464646 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E7F
#403E7F
oklch(40.1% 0.107 281.8)
- #514900
#514900
oklch(40.1% 0.084 102.3)
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 #403E7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.050
- Twilight Blue #0A437A ΔE 0.057
- Twilight #4E518B ΔE 0.061
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.063
- Dusk #4E5481 ΔE 0.069
Use #403E7F 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.