#403C75
Closest named color: Dark Slate Blue (#483D8B). oklch(39% 0.094 284.3), rgb(64, 60, 117).
Aa
White text reads best on this color (9.90:1).
About this color
#403C75 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.094 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 9.90:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.12:1 |
| White text | 9.90:1 |
Values
| HEX | #403C75 |
| RGB | rgb(64, 60, 117) |
| HSL | hsl(244, 32%, 35%) |
| OKLCH | oklch(39% 0.094 284.3) |
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 #403C75 | 9.90:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #403C75 | 2.12:1 | Fails | Lc 11.1 | Not readable |
| #403C75 text on white | 9.90:1 | AAA | Lc 92.8 | Preferred for body text |
| #403C75 text on black | 2.12:1 | 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
#D5D6F3
oklch(88.4% 0.04 284)
-
Step 300
300
#BBBBED
oklch(80.9% 0.07 284.7)
-
Step 400
400
#9896E5
oklch(70.6% 0.114 284.2)
-
Step 500
500
#817BDD
oklch(63.2% 0.144 284.3)
-
Step 600
600
#6B61CA
oklch(55.5% 0.157 284.3)
-
Step 700
700
#5A50AF
oklch(49.1% 0.146 284.4)
-
Step 800
800
#49428E
oklch(42.7% 0.122 284.2)
-
Step 900
900 (this color)
#403C75
oklch(39% 0.094 284.3)
-
Step 950
950
#232242
oklch(27.1% 0.058 283.2)
#403C75 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) | #254577 | 0.041 |
| Deuteranopia (no green cones) | #234174 | 0.040 |
| Tritanopia (no blue cones) | #304853 | 0.080 |
| Achromatopsia (no color) | #434343 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403C75
#403C75
oklch(39% 0.094 284.3)
- #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 #403C75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.057
- Cobalt #1E488F ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.068
- Light Navy #155084 ΔE 0.068
- Twilight #4E518B ΔE 0.070
- Dusk Blue #26538D ΔE 0.073
Use #403C75 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.