#57639B
Closest named color: Dusky Blue (#475F94). oklch(51.5% 0.09 273.6), rgb(87, 99, 155).
Aa
White text reads best on this color (5.73:1).
About this color
#57639B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.090 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.028 away. White text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #57639B |
| RGB | rgb(87, 99, 155) |
| HSL | hsl(229, 28%, 47%) |
| OKLCH | oklch(51.5% 0.09 273.6) |
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 #57639B | 5.73:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #57639B | 3.66:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #57639B text on white | 5.73:1 | AA | Lc 78.6 | Fine for body text |
| #57639B text on black | 3.66:1 | AA large text | Lc -23.2 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#929ECD
oklch(70.7% 0.07 273.4)
-
Step 500
500
#7886C0
oklch(63.2% 0.089 273.2)
-
Step 600
600
#616FAC
oklch(55.7% 0.096 273.1)
-
Step 700
700 (this color)
#57639B
oklch(51.5% 0.09 273.6)
-
Step 800
800
#424C78
oklch(42.8% 0.074 273.2)
-
Step 900
900
#383F61
oklch(37.7% 0.059 274.4)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#57639B 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) | #4F699D | 0.018 |
| Deuteranopia (no green cones) | #4A649A | 0.017 |
| Tritanopia (no blue cones) | #406E78 | 0.079 |
| Achromatopsia (no color) | #666666 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57639B
#57639B
oklch(51.5% 0.09 273.6)
- #796621
#796621
oklch(51.5% 0.09 93.4)
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 #57639B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.028
- French Blue #436BAD ΔE 0.037
- Denim #3B638C ΔE 0.044
- Muted Blue #3B719F ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.050
- Dull Blue #49759C ΔE 0.052
- Twilight #4E518B ΔE 0.056
Use #57639B 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.