#403E73
Closest named color: Dark Slate Blue (#483D8B). oklch(39.3% 0.088 283.3), rgb(64, 62, 115).
Aa
White text reads best on this color (9.74:1).
About this color
#403E73 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.088 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 9.74:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.15:1 |
| White text | 9.74:1 |
Values
| HEX | #403E73 |
| RGB | rgb(64, 62, 115) |
| HSL | hsl(242, 30%, 35%) |
| OKLCH | oklch(39.3% 0.088 283.3) |
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 #403E73 | 9.74:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #403E73 | 2.15:1 | Fails | Lc 11.5 | Not readable |
| #403E73 text on white | 9.74:1 | AAA | Lc 92.5 | Preferred for body text |
| #403E73 text on black | 2.15:1 | Fails | Lc -9.9 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D5D7F1
oklch(88.6% 0.036 282.1)
-
Step 300
300
#BABCEB
oklch(81% 0.066 282.9)
-
Step 400
400
#9898E1
oklch(70.8% 0.106 283.4)
-
Step 500
500
#7F7DD8
oklch(63.2% 0.135 282.8)
-
Step 600
600
#6A64C5
oklch(55.6% 0.146 283.4)
-
Step 700
700
#5852AA
oklch(49% 0.136 283.2)
-
Step 800
800
#48448A
oklch(42.7% 0.113 283.1)
-
Step 900
900 (this color)
#403E73
oklch(39.3% 0.088 283.3)
-
Step 950
950
#232241
oklch(27% 0.057 283.4)
#403E73 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) | #2A4675 | 0.035 |
| Deuteranopia (no green cones) | #284272 | 0.034 |
| Tritanopia (no blue cones) | #304953 | 0.076 |
| Achromatopsia (no color) | #444444 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E73
#403E73
oklch(39.3% 0.088 283.3)
- #4E4700
#4E4700
oklch(39.3% 0.083 103.1)
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 #403E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.057
- Blueberry #464196 ΔE 0.059
- Cobalt #1E488F ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.062
- Light Navy #155084 ΔE 0.065
- Twilight #4E518B ΔE 0.068
- Dusk Blue #26538D ΔE 0.070
Use #403E73 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.