#403379
Closest named color: Dark Slate Blue (#483D8B). oklch(37.5% 0.115 288.1), rgb(64, 51, 121).
Aa
White text reads best on this color (10.67:1).
About this color
#403379 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.115 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.67:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #403379 |
| RGB | rgb(64, 51, 121) |
| HSL | hsl(251, 41%, 34%) |
| OKLCH | oklch(37.5% 0.115 288.1) |
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 #403379 | 10.67:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #403379 | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #403379 text on white | 10.67:1 | AAA | Lc 94.5 | Preferred for body text |
| #403379 text on black | 1.96:1 | Fails | Lc -8.1 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E8FA
oklch(93.7% 0.024 288.5)
-
Step 200
200
#D7D5F8
oklch(88.6% 0.048 288)
-
Step 300
300
#BDB8F6
oklch(80.8% 0.087 288)
-
Step 400
400
#9D91F1
oklch(70.7% 0.138 288.1)
-
Step 500
500
#8773EC
oklch(63.2% 0.175 287.9)
-
Step 600
600
#7357DA
oklch(55.6% 0.191 288.4)
-
Step 700
700
#6046BD
oklch(49% 0.178 288)
-
Step 800
800
#4E3B99
oklch(42.7% 0.147 287.8)
-
Step 900
900 (this color)
#403379
oklch(37.5% 0.115 288.1)
-
Step 950
950
#261F47
oklch(27% 0.072 288.7)
#403379 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) | #0B407B | 0.065 |
| Deuteranopia (no green cones) | #0C3C77 | 0.063 |
| Tritanopia (no blue cones) | #2E4250 | 0.095 |
| Achromatopsia (no color) | #3E3E3E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403379
#403379
oklch(37.5% 0.115 288.1)
- #454400
#454400
oklch(37.5% 0.081 108.8)
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 #403379, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.068
- Cobalt #1E488F ΔE 0.071
- Marine Blue #01386A ΔE 0.076
- Prussian Blue #1D3557 ΔE 0.081
- Indigo #4B0082 ΔE 0.081
- Light Navy #155084 ΔE 0.087
Use #403379 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.