#505A88
Closest named color: Dusk (#4E5481). oklch(47.9% 0.075 273.9), rgb(80, 90, 136).
Aa
White text reads best on this color (6.64:1).
About this color
#505A88 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.075 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.019 away. White text reads best on it, at 6.64:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.15:1 |
| White text | 6.64:1 |
Values
| HEX | #505A88 |
| RGB | rgb(80, 90, 136) |
| HSL | hsl(229, 26%, 42%) |
| OKLCH | oklch(47.9% 0.075 273.9) |
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 #505A88 | 6.64:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #505A88 | 3.15:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #505A88 text on white | 6.64:1 | AA | Lc 82.8 | Fine for body text |
| #505A88 text on black | 3.15:1 | AA large text | Lc -19.1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F1
oklch(93.5% 0.011 274.9)
-
Step 200
200
#D5D8E7
oklch(88.4% 0.021 276.9)
-
Step 300
300
#B9BFD9
oklch(80.8% 0.037 275.2)
-
Step 400
400
#959FC6
oklch(70.8% 0.058 273.6)
-
Step 500
500
#7B86B7
oklch(63% 0.075 274.3)
-
Step 600
600
#6470A3
oklch(55.6% 0.081 273.4)
-
Step 700
700 (this color)
#505A88
oklch(47.9% 0.075 273.9)
-
Step 800
800
#444C71
oklch(42.6% 0.062 274.1)
-
Step 900
900
#39405C
oklch(37.8% 0.049 273.1)
-
Step 950
950
#222536
oklch(27% 0.032 276.3)
#505A88 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) | #4A5F8A | 0.015 |
| Deuteranopia (no green cones) | #465A87 | 0.014 |
| Tritanopia (no blue cones) | #3E636B | 0.067 |
| Achromatopsia (no color) | #5C5C5C | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #505A88
#505A88
oklch(47.9% 0.075 273.9)
- #6B5C26
#6B5C26
oklch(47.8% 0.075 93.8)
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 #505A88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.019
- Dusky Blue #475F94 ΔE 0.023
- Twilight #4E518B ΔE 0.028
- Denim Blue #3B5B92 ΔE 0.030
- Dusty Grape #545775 ΔE 0.030
- Denim #3B638C ΔE 0.034
- YInMn Blue #415A77 ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.041
Use #505A88 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.