#403F80
Closest named color: Dark Slate Blue (#483D8B). oklch(40.3% 0.107 281.2), rgb(64, 63, 128).
Aa
White text reads best on this color (9.37:1).
About this color
#403F80 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 9.37:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #403F80 |
| RGB | rgb(64, 63, 128) |
| HSL | hsl(241, 34%, 37%) |
| OKLCH | oklch(40.3% 0.107 281.2) |
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 #403F80 | 9.37:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #403F80 | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #403F80 text on white | 9.37:1 | AAA | Lc 91.5 | Preferred for body text |
| #403F80 text on black | 2.24:1 | Fails | Lc -10.9 | 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 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#B9BDE9
oklch(81% 0.062 280.8)
-
Step 400
400
#9699DE
oklch(70.7% 0.1 281.6)
-
Step 500
500
#7D7FD4
oklch(63.2% 0.126 281.1)
-
Step 600
600
#6766C1
oklch(55.5% 0.138 281.4)
-
Step 700
700
#5655A7
oklch(49.2% 0.128 281.2)
-
Step 800
800 (this color)
#403F80
oklch(40.3% 0.107 281.2)
-
Step 900
900
#3A3B6C
oklch(37.6% 0.083 280.8)
-
Step 950
950
#22233F
oklch(27% 0.052 280.8)
#403F80 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) | #224982 | 0.043 |
| Deuteranopia (no green cones) | #1D447F | 0.044 |
| Tritanopia (no blue cones) | #294D59 | 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°).
- #403F80
#403F80
oklch(40.3% 0.107 281.2)
- #534900
#534900
oklch(40.3% 0.084 100.4)
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 #403F80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.038
- Cobalt #1E488F ΔE 0.048
- Twilight Blue #0A437A ΔE 0.057
- Twilight #4E518B ΔE 0.058
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.060
- Dusk #4E5481 ΔE 0.066
Use #403F80 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.