#40409B
Closest named color: Blueberry (#464196). oklch(42.6% 0.145 278.3), rgb(64, 64, 155).
Aa
White text reads best on this color (8.66:1).
About this color
#40409B is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.145 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.013 away. White text reads best on it, at 8.66:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #40409B |
| RGB | rgb(64, 64, 155) |
| HSL | hsl(240, 42%, 43%) |
| OKLCH | oklch(42.6% 0.145 278.3) |
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 #40409B | 8.66:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #40409B | 2.42:1 | Fails | Lc 14.6 | Not readable |
| #40409B text on white | 8.66:1 | AAA | Lc 89.4 | Fine for body text |
| #40409B text on black | 2.42:1 | Fails | Lc -12.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FB
oklch(93.7% 0.024 278.4)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B4BCF7
oklch(81% 0.084 278.4)
-
Step 400
400
#8E97F3
oklch(70.8% 0.134 278.1)
-
Step 500
500
#747AEF
oklch(63.2% 0.172 278)
-
Step 600
600
#5F5FDD
oklch(55.5% 0.187 278.4)
-
Step 700
700
#4F4EC0
oklch(49.2% 0.174 278.3)
-
Step 800
800 (this color)
#40409B
oklch(42.6% 0.145 278.3)
-
Step 900
900
#36387C
oklch(37.8% 0.113 278.3)
-
Step 950
950
#1F2148
oklch(26.9% 0.071 278.2)
#40409B 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) | #004F9E | 0.059 |
| Deuteranopia (no green cones) | #004899 | 0.055 |
| Tritanopia (no blue cones) | #065667 | 0.126 |
| Achromatopsia (no color) | #4B4B4B | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40409B
#40409B
oklch(42.6% 0.145 278.3)
- #5B4E00
#5B4E00
oklch(42.4% 0.088 98.1)
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 #40409B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.013
- Dark Slate Blue #483D8B ΔE 0.029
- Cobalt #1E488F ΔE 0.048
- Sapphire #2138AB ΔE 0.053
- Twilight #4E518B ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Rebecca Purple #663399 ΔE 0.069
- Light Navy #155084 ΔE 0.073
Use #40409B 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.