#42587F
Closest named color: YInMn Blue (#415A77). oklch(46% 0.07 261.4), rgb(66, 88, 127).
Aa
White text reads best on this color (7.15:1).
About this color
#42587F is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.070 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.016 away. White text reads best on it, at 7.15:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.93:1 |
| White text | 7.15:1 |
Values
| HEX | #42587F |
| RGB | rgb(66, 88, 127) |
| HSL | hsl(218, 32%, 38%) |
| OKLCH | oklch(46% 0.07 261.4) |
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 #42587F | 7.15:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #42587F | 2.93:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #42587F text on white | 7.15:1 | AAA | Lc 84.8 | Fine for body text |
| #42587F text on black | 2.93:1 | Fails | Lc -17.2 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E6
oklch(88.4% 0.019 263)
-
Step 300
300
#B5C1D7
oklch(80.9% 0.034 262.7)
-
Step 400
400
#8EA1C3
oklch(70.6% 0.054 262)
-
Step 500
500
#728AB4
oklch(63.1% 0.069 261.4)
-
Step 600
600
#5B749F
oklch(55.7% 0.074 261)
-
Step 700
700 (this color)
#42587F
oklch(46% 0.07 261.4)
-
Step 800
800
#3D4F6F
oklch(42.7% 0.058 261.6)
-
Step 900
900
#34425A
oklch(37.7% 0.045 261)
-
Step 950
950
#1F2735
oklch(27.2% 0.029 261.4)
#42587F 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) | #495B81 | 0.014 |
| Deuteranopia (no green cones) | #43557E | 0.009 |
| Tritanopia (no blue cones) | #2A6066 | 0.061 |
| Achromatopsia (no color) | #585858 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42587F
#42587F
oklch(46% 0.07 261.4)
- #6C5427
#6C5427
oklch(46.1% 0.07 81.3)
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 #42587F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.016
- Dusk #4E5481 ΔE 0.020
- Light Navy Blue #2E5A88 ΔE 0.025
- Dusty Grape #545775 ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.031
- Denim #3B638C ΔE 0.034
- Twilight #4E518B ΔE 0.035
- Dusky Blue #475F94 ΔE 0.038
Use #42587F 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.