#403E7A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.099 282.4), rgb(64, 62, 122).
Aa
White text reads best on this color (9.59:1).
About this color
#403E7A is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 9.59:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.59:1 |
Values
| HEX | #403E7A |
| RGB | rgb(64, 62, 122) |
| HSL | hsl(242, 33%, 36%) |
| OKLCH | oklch(39.7% 0.099 282.4) |
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 #403E7A | 9.59:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #403E7A | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #403E7A text on white | 9.59:1 | AAA | Lc 92.1 | Preferred for body text |
| #403E7A text on black | 2.18:1 | Fails | Lc -10.3 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F8
oklch(93.5% 0.022 283.1)
-
Step 200
200
#D4D6F4
oklch(88.4% 0.041 282.5)
-
Step 300
300
#B9BBF0
oklch(80.9% 0.075 282.9)
-
Step 400
400
#9697E8
oklch(70.8% 0.117 282.4)
-
Step 500
500
#7D7AE2
oklch(63% 0.153 282.4)
-
Step 600
600
#6861CF
oklch(55.6% 0.165 282.5)
-
Step 700
700
#5750B3
oklch(49.2% 0.152 282.4)
-
Step 800
800
#474291
oklch(42.7% 0.126 282.5)
-
Step 900
900 (this color)
#403E7A
oklch(39.7% 0.099 282.4)
-
Step 950
950
#222144
oklch(26.9% 0.064 282.5)
#403E7A 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) | #25477C | 0.040 |
| Deuteranopia (no green cones) | #224379 | 0.040 |
| Tritanopia (no blue cones) | #2D4B56 | 0.086 |
| Achromatopsia (no color) | #454545 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E7A
#403E7A
oklch(39.7% 0.099 282.4)
- #504800
#504800
oklch(39.7% 0.083 102.2)
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 #403E7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.048
- Cobalt #1E488F ΔE 0.054
- Twilight Blue #0A437A ΔE 0.056
- Light Navy #155084 ΔE 0.063
- Twilight #4E518B ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Dusk #4E5481 ΔE 0.069
Use #403E7A 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.