#42559F
Closest named color: Denim Blue (#3B5B92). oklch(47.2% 0.121 270.4), rgb(66, 85, 159).
Aa
White text reads best on this color (6.92:1).
About this color
#42559F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.121 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.030 away. White text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #42559F |
| RGB | rgb(66, 85, 159) |
| HSL | hsl(228, 41%, 44%) |
| OKLCH | oklch(47.2% 0.121 270.4) |
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 #42559F | 6.92:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #42559F | 3.03:1 | AA large text | Lc 20.3 | Dividers and decoration only |
| #42559F text on white | 6.92:1 | AA | Lc 83.8 | Fine for body text |
| #42559F text on black | 3.03:1 | AA large text | Lc -18.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2BFE7
oklch(80.8% 0.058 270.9)
-
Step 400
400
#8A9EDC
oklch(70.8% 0.094 270.2)
-
Step 500
500
#6E84D2
oklch(63% 0.12 270.7)
-
Step 600
600
#576DBF
oklch(55.7% 0.13 270.4)
-
Step 700
700 (this color)
#42559F
oklch(47.2% 0.121 270.4)
-
Step 800
800
#3A4A86
oklch(42.7% 0.101 270.4)
-
Step 900
900
#323E6B
oklch(37.6% 0.079 270.9)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#42559F 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) | #335EA2 | 0.027 |
| Deuteranopia (no green cones) | #26569D | 0.030 |
| Tritanopia (no blue cones) | #006572 | 0.108 |
| Achromatopsia (no color) | #5A5A5A | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42559F
#42559F
oklch(47.2% 0.121 270.4)
- #705800
#705800
oklch(47.1% 0.096 90.3)
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 #42559F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.030
- Twilight #4E518B ΔE 0.035
- Dusky Blue #475F94 ΔE 0.037
- Dusk Blue #26538D ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.049
- Dusk #4E5481 ΔE 0.051
- Blueberry #464196 ΔE 0.053
- Denim #3B638C ΔE 0.056
Use #42559F 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.