#403A79
Closest named color: Dark Slate Blue (#483D8B). oklch(38.8% 0.104 284.8), rgb(64, 58, 121).
Aa
White text reads best on this color (10.00:1).
About this color
#403A79 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.104 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 10.00:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #403A79 |
| RGB | rgb(64, 58, 121) |
| HSL | hsl(246, 35%, 35%) |
| OKLCH | oklch(38.8% 0.104 284.8) |
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 #403A79 | 10.00:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #403A79 | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #403A79 text on white | 10.00:1 | AAA | Lc 93.0 | Preferred for body text |
| #403A79 text on black | 2.09:1 | Fails | Lc -9.4 | 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
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D5D6F5
oklch(88.5% 0.042 284)
-
Step 300
300
#BBBAF2
oklch(80.9% 0.079 285.3)
-
Step 400
400
#9995EB
oklch(70.8% 0.124 284.9)
-
Step 500
500
#8178E4
oklch(63.1% 0.158 284.7)
-
Step 600
600
#6C5ED2
oklch(55.6% 0.172 284.8)
-
Step 700
700
#5B4DB6
oklch(49.2% 0.16 285)
-
Step 800
800
#4A4094
oklch(42.8% 0.133 284.7)
-
Step 900
900 (this color)
#403A79
oklch(38.8% 0.104 284.8)
-
Step 950
950
#242145
oklch(27.1% 0.065 285)
#403A79 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) | #1E447B | 0.048 |
| Deuteranopia (no green cones) | #1C4078 | 0.048 |
| Tritanopia (no blue cones) | #2E4754 | 0.087 |
| Achromatopsia (no color) | #424242 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403A79
#403A79
oklch(38.8% 0.104 284.8)
- #4C4600
#4C4600
oklch(38.8% 0.082 104)
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 #403A79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Light Navy #155084 ΔE 0.071
- Twilight #4E518B ΔE 0.073
- Dusk Blue #26538D ΔE 0.075
- Marine Blue #01386A ΔE 0.075
Use #403A79 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.