#403E71
Closest named color: Dark Slate Blue (#483D8B). oklch(39.1% 0.085 283.5), rgb(64, 62, 113).
Aa
White text reads best on this color (9.78:1).
About this color
#403E71 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.085 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 9.78:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.14:1 |
| White text | 9.78:1 |
Values
| HEX | #403E71 |
| RGB | rgb(64, 62, 113) |
| HSL | hsl(242, 29%, 34%) |
| OKLCH | oklch(39.1% 0.085 283.5) |
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 #403E71 | 9.78:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #403E71 | 2.14:1 | Fails | Lc 11.3 | Not readable |
| #403E71 text on white | 9.78:1 | AAA | Lc 92.6 | Preferred for body text |
| #403E71 text on black | 2.14:1 | Fails | Lc -9.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9898DE
oklch(70.7% 0.102 283.5)
-
Step 500
500
#807DD5
oklch(63.1% 0.13 283.6)
-
Step 600
600
#6A65C2
oklch(55.6% 0.141 283.3)
-
Step 700
700
#5953A8
oklch(49.1% 0.132 283.6)
-
Step 800
800
#484488
oklch(42.6% 0.11 283.4)
-
Step 900
900 (this color)
#403E71
oklch(39.1% 0.085 283.5)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#403E71 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) | #2C4573 | 0.032 |
| Deuteranopia (no green cones) | #294270 | 0.033 |
| Tritanopia (no blue cones) | #314852 | 0.072 |
| Achromatopsia (no color) | #444444 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E71
#403E71
oklch(39.1% 0.085 283.5)
- #4D4700
#4D4700
oklch(39.1% 0.083 104.1)
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 #403E71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Cobalt #1E488F ΔE 0.063
- Light Navy #155084 ΔE 0.066
- Twilight #4E518B ΔE 0.069
- Dusk #4E5481 ΔE 0.071
Use #403E71 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.