#57639D
Closest named color: Dusky Blue (#475F94). oklch(51.6% 0.093 273.8), rgb(87, 99, 157).
Aa
White text reads best on this color (5.71:1).
About this color
#57639D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.093 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.029 away. White text reads best on it, at 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.67:1 |
| White text | 5.71:1 |
Values
| HEX | #57639D |
| RGB | rgb(87, 99, 157) |
| HSL | hsl(230, 29%, 48%) |
| OKLCH | oklch(51.6% 0.093 273.8) |
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 #57639D | 5.71:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #57639D | 3.67:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #57639D text on white | 5.71:1 | AA | Lc 78.5 | Fine for body text |
| #57639D text on black | 3.67:1 | AA large text | Lc -23.3 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
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
#B7BFDE
oklch(80.8% 0.045 273.9)
-
Step 400
400
#929ECE
oklch(70.7% 0.072 273.6)
-
Step 500
500
#7885C1
oklch(63% 0.092 274.1)
-
Step 600
600
#616EAE
oklch(55.6% 0.101 274)
-
Step 700
700 (this color)
#57639D
oklch(51.6% 0.093 273.8)
-
Step 800
800
#424B79
oklch(42.7% 0.077 274.3)
-
Step 900
900
#373F62
oklch(37.7% 0.061 273.3)
-
Step 950
950
#202539
oklch(26.9% 0.038 272.9)
#57639D 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) | #4E699F | 0.019 |
| Deuteranopia (no green cones) | #48649C | 0.020 |
| Tritanopia (no blue cones) | #3F6F78 | 0.084 |
| Achromatopsia (no color) | #666666 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57639D
#57639D
oklch(51.6% 0.093 273.8)
- #79661D
#79661D
oklch(51.5% 0.093 94)
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 #57639D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.029
- French Blue #436BAD ΔE 0.035
- Denim #3B638C ΔE 0.046
- Muted Blue #3B719F ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.050
- Dull Blue #49759C ΔE 0.053
- Mid Blue #276AB3 ΔE 0.057
Use #57639D 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.