#42459B
Closest named color: Blueberry (#464196). oklch(43.7% 0.137 277.6), rgb(66, 69, 155).
Aa
White text reads best on this color (8.21:1).
About this color
#42459B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.137 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 8.21:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.55:1 |
| White text | 8.21:1 |
Values
| HEX | #42459B |
| RGB | rgb(66, 69, 155) |
| HSL | hsl(238, 40%, 43%) |
| OKLCH | oklch(43.7% 0.137 277.6) |
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 #42459B | 8.21:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #42459B | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #42459B text on white | 8.21:1 | AAA | Lc 88.1 | Fine for body text |
| #42459B text on black | 2.55:1 | Fails | Lc -14.1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D1D7F7
oklch(88.5% 0.044 277.1)
-
Step 300
300
#B3BCF5
oklch(80.8% 0.081 277.4)
-
Step 400
400
#8E98F0
oklch(70.8% 0.129 277.6)
-
Step 500
500
#747BEA
oklch(63% 0.164 277.9)
-
Step 600
600
#5E62D8
oklch(55.6% 0.177 277.5)
-
Step 700
700
#4E50BC
oklch(49.1% 0.166 277.6)
-
Step 800
800 (this color)
#42459B
oklch(43.7% 0.137 277.6)
-
Step 900
900
#353979
oklch(37.7% 0.107 277.3)
-
Step 950
950
#1F2247
oklch(27.1% 0.068 277.3)
#42459B 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) | #0C539E | 0.055 |
| Deuteranopia (no green cones) | #004B99 | 0.055 |
| Tritanopia (no blue cones) | #105969 | 0.120 |
| Achromatopsia (no color) | #4F4F4F | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42459B
#42459B
oklch(43.7% 0.137 277.6)
- #5F5100
#5F5100
oklch(43.6% 0.09 97.6)
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 #42459B, 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 0.032
- Cobalt #1E488F ΔE 0.047
- Twilight #4E518B ΔE 0.050
- Dusk Blue #26538D ΔE 0.055
- Sapphire #2138AB ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.064
- Light Navy #155084 ΔE 0.068
Use #42459B 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.