#42549B
Closest named color: Denim Blue (#3B5B92). oklch(46.8% 0.117 270.6), rgb(66, 84, 155).
Aa
White text reads best on this color (7.06:1).
About this color
#42549B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.117 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.028 away. White text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.97:1 |
| White text | 7.06:1 |
Values
| HEX | #42549B |
| RGB | rgb(66, 84, 155) |
| HSL | hsl(228, 40%, 43%) |
| OKLCH | oklch(46.8% 0.117 270.6) |
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 #42549B | 7.06:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #42549B | 2.97:1 | Fails | Lc 19.7 | Dividers and decoration only |
| #42549B text on white | 7.06:1 | AAA | Lc 84.3 | Fine for body text |
| #42549B text on black | 2.97:1 | Fails | Lc -17.7 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B3BFE6
oklch(80.8% 0.057 271.7)
-
Step 400
400
#8B9EDA
oklch(70.7% 0.091 270.5)
-
Step 500
500
#6F85CF
oklch(63.1% 0.115 270.3)
-
Step 600
600
#586DBC
oklch(55.6% 0.125 270.7)
-
Step 700
700 (this color)
#42549B
oklch(46.8% 0.117 270.6)
-
Step 800
800
#3B4A84
oklch(42.6% 0.098 270.8)
-
Step 900
900
#333F6A
oklch(37.9% 0.075 270.7)
-
Step 950
950
#1E253E
oklch(27.1% 0.048 271.1)
#42549B 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) | #345D9E | 0.027 |
| Deuteranopia (no green cones) | #285599 | 0.028 |
| Tritanopia (no blue cones) | #0A6470 | 0.104 |
| Achromatopsia (no color) | #585858 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42549B
#42549B
oklch(46.8% 0.117 270.6)
- #6E5700
#6E5700
oklch(46.7% 0.095 90.9)
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 #42549B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.028
- Twilight #4E518B ΔE 0.030
- Dusky Blue #475F94 ΔE 0.037
- Dusk Blue #26538D ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.045
- Dusk #4E5481 ΔE 0.045
- Blueberry #464196 ΔE 0.050
- Denim #3B638C ΔE 0.054
Use #42549B 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.