#42558C
Closest named color: Denim Blue (#3B5B92). oklch(46% 0.093 268.2), rgb(66, 85, 140).
Aa
White text reads best on this color (7.21:1).
About this color
#42558C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.093 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.019 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.90:1 |
| White text | 7.21:1 |
Values
| HEX | #42558C |
| RGB | rgb(66, 85, 140) |
| HSL | hsl(225, 36%, 40%) |
| OKLCH | oklch(46% 0.093 268.2) |
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 #42558C | 7.21:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #42558C | 2.90:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #42558C text on white | 7.21:1 | AAA | Lc 84.9 | Fine for body text |
| #42558C text on black | 2.90:1 | Fails | Lc -17.1 | 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
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8D9FCE
oklch(70.6% 0.072 268.3)
-
Step 500
500
#7287C2
oklch(63.1% 0.093 268.7)
-
Step 600
600
#5A70AE
oklch(55.5% 0.1 268.2)
-
Step 700
700 (this color)
#42558C
oklch(46% 0.093 268.2)
-
Step 800
800
#3D4D79
oklch(42.7% 0.076 267.9)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#42558C 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) | #3F5B8E | 0.017 |
| Deuteranopia (no green cones) | #37548B | 0.015 |
| Tritanopia (no blue cones) | #20616A | 0.083 |
| Achromatopsia (no color) | #575757 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42558C
#42558C
oklch(46% 0.093 268.2)
- #6E5403
#6E5403
oklch(46% 0.093 87.5)
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 #42558C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.019
- Twilight #4E518B ΔE 0.019
- Dusk #4E5481 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.027
- Dusky Blue #475F94 ΔE 0.031
- Dusk Blue #26538D ΔE 0.032
- Denim #3B638C ΔE 0.041
- YInMn Blue #415A77 ΔE 0.041
Use #42558C 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.