#404371
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.077 279.5), rgb(64, 67, 113).
Aa
White text reads best on this color (9.29:1).
About this color
#404371 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.077 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #404371 |
| RGB | rgb(64, 67, 113) |
| HSL | hsl(236, 28%, 35%) |
| OKLCH | oklch(40.2% 0.077 279.5) |
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 #404371 | 9.29:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #404371 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #404371 text on white | 9.29:1 | AAA | Lc 91.4 | Preferred for body text |
| #404371 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EA
oklch(88.5% 0.025 278.3)
-
Step 300
300
#BABEDE
oklch(80.9% 0.045 279.7)
-
Step 400
400
#979CCD
oklch(70.6% 0.072 279.9)
-
Step 500
500
#7E83C0
oklch(63% 0.092 279.8)
-
Step 600
600
#686CAD
oklch(55.6% 0.1 279.9)
-
Step 700
700
#565A94
oklch(49.1% 0.092 279.4)
-
Step 800
800 (this color)
#404371
oklch(40.2% 0.077 279.5)
-
Step 900
900
#3B3E61
oklch(37.7% 0.06 279.4)
-
Step 950
950
#232439
oklch(27% 0.039 281.4)
#404371 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) | #334973 | 0.023 |
| Deuteranopia (no green cones) | #304570 | 0.023 |
| Tritanopia (no blue cones) | #314C54 | 0.068 |
| Achromatopsia (no color) | #474747 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404371
#404371
oklch(40.2% 0.077 279.5)
- #52490C
#52490C
oklch(40.3% 0.077 100.4)
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 #404371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.053
- Twilight Blue #0A437A ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Dusk #4E5481 ΔE 0.059
- Twilight #4E518B ΔE 0.060
- Cobalt #1E488F ΔE 0.061
- Dusk Blue #26538D ΔE 0.062
Use #404371 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.