#42409A
Closest named color: Blueberry (#464196). oklch(42.6% 0.143 279.4), rgb(66, 64, 154).
Aa
White text reads best on this color (8.63:1).
About this color
#42409A is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.143 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.010 away. White text reads best on it, at 8.63:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #42409A |
| RGB | rgb(66, 64, 154) |
| HSL | hsl(241, 41%, 43%) |
| OKLCH | oklch(42.6% 0.143 279.4) |
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 #42409A | 8.63:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #42409A | 2.43:1 | Fails | Lc 14.7 | Not readable |
| #42409A text on white | 8.63:1 | AAA | Lc 89.3 | Fine for body text |
| #42409A text on black | 2.43:1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F8
oklch(88.6% 0.046 278.6)
-
Step 300
300
#B5BBF6
oklch(80.8% 0.084 279.8)
-
Step 400
400
#9096F2
oklch(70.7% 0.134 279.5)
-
Step 500
500
#7779ED
oklch(63.1% 0.17 279.6)
-
Step 600
600
#625FDC
oklch(55.7% 0.186 279.6)
-
Step 700
700
#514DBF
oklch(49.1% 0.173 279.4)
-
Step 800
800 (this color)
#42409A
oklch(42.6% 0.143 279.4)
-
Step 900
900
#37387B
oklch(37.8% 0.111 279)
-
Step 950
950
#202148
oklch(27% 0.071 279.4)
#42409A 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) | #004F9D | 0.061 |
| Deuteranopia (no green cones) | #004898 | 0.058 |
| Tritanopia (no blue cones) | #135566 | 0.124 |
| Achromatopsia (no color) | #4C4C4C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42409A
#42409A
oklch(42.6% 0.143 279.4)
- #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 #42409A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.010
- Dark Slate Blue #483D8B ΔE 0.027
- Cobalt #1E488F ΔE 0.049
- Sapphire #2138AB ΔE 0.056
- Twilight #4E518B ΔE 0.059
- Dusk Blue #26538D ΔE 0.063
- Rebecca Purple #663399 ΔE 0.067
- Light Navy #155084 ΔE 0.073
Use #42409A 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.