#42409C
Closest named color: Blueberry (#464196). oklch(42.8% 0.146 279.3), rgb(66, 64, 156).
Aa
White text reads best on this color (8.58:1).
About this color
#42409C is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.146 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.012 away. White text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #42409C |
| RGB | rgb(66, 64, 156) |
| HSL | hsl(241, 42%, 43%) |
| OKLCH | oklch(42.8% 0.146 279.3) |
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 #42409C | 8.58:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #42409C | 2.44:1 | Fails | Lc 14.8 | Not readable |
| #42409C text on white | 8.58:1 | AAA | Lc 89.2 | Fine for body text |
| #42409C text on black | 2.44:1 | Fails | Lc -13.1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FB
oklch(93.7% 0.024 278.4)
-
Step 200
200
#D2D7F9
oklch(88.6% 0.047 278.8)
-
Step 300
300
#B4BBF7
oklch(80.8% 0.085 279.1)
-
Step 400
400
#8F96F4
oklch(70.7% 0.137 279)
-
Step 500
500
#7679EF
oklch(63.1% 0.173 279.1)
-
Step 600
600
#615EDE
oklch(55.6% 0.19 279.3)
-
Step 700
700
#514DC1
oklch(49.2% 0.176 279.3)
-
Step 800
800 (this color)
#42409C
oklch(42.8% 0.146 279.3)
-
Step 900
900
#37377C
oklch(37.7% 0.114 279.4)
-
Step 950
950
#202148
oklch(27% 0.071 279.4)
#42409C 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) | #00509F | 0.062 |
| Deuteranopia (no green cones) | #00489A | 0.058 |
| Tritanopia (no blue cones) | #105667 | 0.127 |
| Achromatopsia (no color) | #4C4C4C | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42409C
#42409C
oklch(42.8% 0.146 279.3)
- #5B4F00
#5B4F00
oklch(42.7% 0.088 99.2)
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 #42409C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.012
- Dark Slate Blue #483D8B ΔE 0.030
- Cobalt #1E488F ΔE 0.051
- Sapphire #2138AB ΔE 0.055
- Twilight #4E518B ΔE 0.061
- Dusk Blue #26538D ΔE 0.065
- Rebecca Purple #663399 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
Use #42409C 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.