#403B78
Closest named color: Dark Slate Blue (#483D8B). oklch(39% 0.101 284.4), rgb(64, 59, 120).
Aa
White text reads best on this color (9.93:1).
About this color
#403B78 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.101 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.93:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.11:1 |
| White text | 9.93:1 |
Values
| HEX | #403B78 |
| RGB | rgb(64, 59, 120) |
| HSL | hsl(245, 34%, 35%) |
| OKLCH | oklch(39% 0.101 284.4) |
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 #403B78 | 9.93:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #403B78 | 2.11:1 | Fails | Lc 11.1 | Not readable |
| #403B78 text on white | 9.93:1 | AAA | Lc 92.9 | Preferred for body text |
| #403B78 text on black | 2.11:1 | Fails | Lc -9.6 | 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
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D5D6F5
oklch(88.5% 0.042 284)
-
Step 300
300
#BABBF0
oklch(81% 0.074 283.8)
-
Step 400
400
#9895E9
oklch(70.6% 0.121 284.5)
-
Step 500
500
#8179E2
oklch(63.1% 0.154 284.5)
-
Step 600
600
#6B5FD0
oklch(55.5% 0.168 284.3)
-
Step 700
700
#5A4EB4
oklch(49.1% 0.156 284.4)
-
Step 800
800
#494192
oklch(42.8% 0.129 284)
-
Step 900
900 (this color)
#403B78
oklch(39% 0.101 284.4)
-
Step 950
950
#232144
oklch(27% 0.064 283.9)
#403B78 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) | #21457A | 0.046 |
| Deuteranopia (no green cones) | #1F4177 | 0.045 |
| Tritanopia (no blue cones) | #2E4853 | 0.087 |
| Achromatopsia (no color) | #434343 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B78
#403B78
oklch(39% 0.101 284.4)
- #4C4700
#4C4700
oklch(39% 0.083 105)
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 #403B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.058
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.069
- Twilight #4E518B ΔE 0.071
- Dark Grey Blue #29465B ΔE 0.073
- Dusk Blue #26538D ΔE 0.073
Use #403B78 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.