#42548A
Closest named color: Twilight (#4E518B). oklch(45.7% 0.091 268.7), rgb(66, 84, 138).
Aa
White text reads best on this color (7.32:1).
About this color
#42548A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.091 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.018 away. White text reads best on it, at 7.32:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.86:1 |
| White text | 7.32:1 |
Values
| HEX | #42548A |
| RGB | rgb(66, 84, 138) |
| HSL | hsl(225, 35%, 40%) |
| OKLCH | oklch(45.7% 0.091 268.7) |
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 #42548A | 7.32:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #42548A | 2.86:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #42548A text on white | 7.32:1 | AAA | Lc 85.3 | Fine for body text |
| #42548A text on black | 2.86:1 | Fails | Lc -16.7 | 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 800.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8A9FD7
oklch(70.8% 0.086 268.3)
-
Step 500
500
#6E86CC
oklch(63.1% 0.109 268.8)
-
Step 600
600
#576FB9
oklch(55.7% 0.119 268.8)
-
Step 700
700
#475C9F
oklch(49.1% 0.11 269)
-
Step 800
800 (this color)
#42548A
oklch(45.7% 0.091 268.7)
-
Step 900
900
#323F67
oklch(37.6% 0.071 269.2)
-
Step 950
950
#1D253D
oklch(26.9% 0.046 269.1)
#42548A 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) | #3F5A8C | 0.017 |
| Deuteranopia (no green cones) | #375389 | 0.015 |
| Tritanopia (no blue cones) | #226068 | 0.083 |
| Achromatopsia (no color) | #565656 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42548A
#42548A
oklch(45.7% 0.091 268.7)
- #6C5405
#6C5405
oklch(45.8% 0.091 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 #42548A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.018
- Dusk #4E5481 ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.027
- Dusk Blue #26538D ΔE 0.032
- Dusky Blue #475F94 ΔE 0.034
- YInMn Blue #415A77 ΔE 0.040
- Denim #3B638C ΔE 0.043
Use #42548A 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.