#404B8B
Closest named color: Twilight (#4E518B). oklch(43.6% 0.106 273.9), rgb(64, 75, 139).
Aa
White text reads best on this color (8.08:1).
About this color
#404B8B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.106 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.028 away. White text reads best on it, at 8.08:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.59:1 |
| White text | 8.08:1 |
Values
| HEX | #404B8B |
| RGB | rgb(64, 75, 139) |
| HSL | hsl(231, 37%, 40%) |
| OKLCH | oklch(43.6% 0.106 273.9) |
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 #404B8B | 8.08:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #404B8B | 2.59:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #404B8B text on white | 8.08:1 | AAA | Lc 87.8 | Fine for body text |
| #404B8B text on black | 2.59:1 | Fails | Lc -14.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F1
oklch(88.5% 0.035 274.9)
-
Step 300
300
#B4BEE9
oklch(80.8% 0.062 274.7)
-
Step 400
400
#8D9CDE
oklch(70.7% 0.098 273.8)
-
Step 500
500
#7282D5
oklch(63% 0.126 274)
-
Step 600
600
#5B6AC3
oklch(55.6% 0.138 273.9)
-
Step 700
700
#4B58A8
oklch(49.1% 0.128 273.8)
-
Step 800
800 (this color)
#404B8B
oklch(43.6% 0.106 273.9)
-
Step 900
900
#343D6D
oklch(37.7% 0.083 273.8)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#404B8B 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) | #2F538D | 0.028 |
| Deuteranopia (no green cones) | #274D8A | 0.029 |
| Tritanopia (no blue cones) | #1E5964 | 0.094 |
| Achromatopsia (no color) | #505050 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404B8B
#404B8B
oklch(43.6% 0.106 273.9)
- #625000
#625000
oklch(43.7% 0.09 93.9)
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 #404B8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.028
- Dusk Blue #26538D ΔE 0.034
- Blueberry #464196 ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.038
- Dusk #4E5481 ΔE 0.041
- Cobalt #1E488F ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.045
- Light Navy #155084 ΔE 0.046
Use #404B8B 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.