#42558E
Closest named color: Denim Blue (#3B5B92). oklch(46.2% 0.096 268.5), rgb(66, 85, 142).
Aa
White text reads best on this color (7.18:1).
About this color
#42558E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.096 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.018 away. White text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #42558E |
| RGB | rgb(66, 85, 142) |
| HSL | hsl(225, 37%, 41%) |
| OKLCH | oklch(46.2% 0.096 268.5) |
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 #42558E | 7.18:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #42558E | 2.92:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #42558E text on white | 7.18:1 | AAA | Lc 84.8 | Fine for body text |
| #42558E text on black | 2.92:1 | Fails | Lc -17.2 | Dividers and decoration only |
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 700.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0E0
oklch(80.9% 0.047 269.1)
-
Step 400
400
#8D9FD0
oklch(70.7% 0.075 268.8)
-
Step 500
500
#7187C3
oklch(63.1% 0.094 268.2)
-
Step 600
600
#5A70B0
oklch(55.6% 0.103 268.5)
-
Step 700
700 (this color)
#42558E
oklch(46.2% 0.096 268.5)
-
Step 800
800
#3D4D7B
oklch(42.9% 0.079 268.4)
-
Step 900
900
#344063
oklch(37.8% 0.062 268.9)
-
Step 950
950
#1E263A
oklch(27.1% 0.039 267.1)
#42558E 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) | #3E5B90 | 0.017 |
| Deuteranopia (no green cones) | #36548D | 0.016 |
| Tritanopia (no blue cones) | #1E616A | 0.086 |
| Achromatopsia (no color) | #575757 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42558E
#42558E
oklch(46.2% 0.096 268.5)
- #6E5500
#6E5500
oklch(46.2% 0.094 88.9)
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 #42558E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.018
- Twilight #4E518B ΔE 0.019
- Dusk #4E5481 ΔE 0.026
- Light Navy Blue #2E5A88 ΔE 0.029
- Dusky Blue #475F94 ΔE 0.030
- Dusk Blue #26538D ΔE 0.032
- Denim #3B638C ΔE 0.042
- YInMn Blue #415A77 ΔE 0.044
Use #42558E 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.