#42509A
Closest named color: Twilight (#4E518B). oklch(45.8% 0.121 272.7), rgb(66, 80, 154).
Aa
White text reads best on this color (7.37:1).
About this color
#42509A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.121 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.030 away. White text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #42509A |
| RGB | rgb(66, 80, 154) |
| HSL | hsl(230, 40%, 43%) |
| OKLCH | oklch(45.8% 0.121 272.7) |
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 #42509A | 7.37:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #42509A | 2.84:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #42509A text on white | 7.37:1 | AAA | Lc 85.4 | Fine for body text |
| #42509A text on black | 2.84:1 | Fails | Lc -16.6 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B1BEEF
oklch(80.8% 0.071 273.1)
-
Step 400
400
#899BE7
oklch(70.6% 0.113 273)
-
Step 500
500
#6D81E0
oklch(63.1% 0.144 272.7)
-
Step 600
600
#5668CE
oklch(55.6% 0.158 272.7)
-
Step 700
700
#4756B2
oklch(49.1% 0.146 272.9)
-
Step 800
800 (this color)
#42509A
oklch(45.8% 0.121 272.7)
-
Step 900
900
#313C73
oklch(37.6% 0.095 272.6)
-
Step 950
950
#1D2443
oklch(27.1% 0.058 272.4)
#42509A 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) | #2D5A9D | 0.033 |
| Deuteranopia (no green cones) | #215298 | 0.035 |
| Tritanopia (no blue cones) | #0E606D | 0.107 |
| Achromatopsia (no color) | #565656 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42509A
#42509A
oklch(45.8% 0.121 272.7)
- #6A5500
#6A5500
oklch(45.8% 0.094 92.2)
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 #42509A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.036
- Blueberry #464196 ΔE 0.039
- Dusk Blue #26538D ΔE 0.040
- Dusky Blue #475F94 ΔE 0.047
- Dusk #4E5481 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.049
- Cobalt #1E488F ΔE 0.052
Use #42509A 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.