#403F7C
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.1 281.6), rgb(64, 63, 124).
Aa
White text reads best on this color (9.45:1).
About this color
#403F7C is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.45:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #403F7C |
| RGB | rgb(64, 63, 124) |
| HSL | hsl(241, 33%, 37%) |
| OKLCH | oklch(40.1% 0.1 281.6) |
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 #403F7C | 9.45:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #403F7C | 2.22:1 | Fails | Lc 12.2 | Not readable |
| #403F7C text on white | 9.45:1 | AAA | Lc 91.7 | Preferred for body text |
| #403F7C text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F5
oklch(88.4% 0.043 282.6)
-
Step 300
300
#B8BBF1
oklch(80.8% 0.076 282.1)
-
Step 400
400
#9497EA
oklch(70.7% 0.121 281.3)
-
Step 500
500
#7C7BE3
oklch(63.2% 0.153 281.5)
-
Step 600
600
#6661D1
oklch(55.6% 0.168 281.5)
-
Step 700
700
#5550B5
oklch(49.1% 0.155 281.3)
-
Step 800
800
#464293
oklch(42.8% 0.129 281.7)
-
Step 900
900 (this color)
#403F7C
oklch(40.1% 0.1 281.6)
-
Step 950
950
#222244
oklch(27.1% 0.062 281.4)
#403F7C 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) | #25487E | 0.040 |
| Deuteranopia (no green cones) | #22447B | 0.040 |
| Tritanopia (no blue cones) | #2B4C57 | 0.088 |
| Achromatopsia (no color) | #464646 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F7C
#403F7C
oklch(40.1% 0.1 281.6)
- #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 #403F7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.044
- Cobalt #1E488F ΔE 0.051
- Twilight Blue #0A437A ΔE 0.056
- Twilight #4E518B ΔE 0.060
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.062
- Dusk #4E5481 ΔE 0.066
Use #403F7C 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.