#42587B
Closest named color: YInMn Blue (#415A77). oklch(45.8% 0.064 259.5), rgb(66, 88, 123).
Aa
White text reads best on this color (7.20:1).
About this color
#42587B is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.064 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.010 away. White text reads best on it, at 7.20:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.91:1 |
| White text | 7.20:1 |
Values
| HEX | #42587B |
| RGB | rgb(66, 88, 123) |
| HSL | hsl(217, 30%, 37%) |
| OKLCH | oklch(45.8% 0.064 259.5) |
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 #42587B | 7.20:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #42587B | 2.91:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #42587B text on white | 7.20:1 | AAA | Lc 85.0 | Fine for body text |
| #42587B text on black | 2.91:1 | Fails | Lc -17.0 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B3C2D9
oklch(81% 0.036 258.9)
-
Step 400
400
#8BA2C6
oklch(70.7% 0.059 259.3)
-
Step 500
500
#6E8BB8
oklch(63.2% 0.076 259)
-
Step 600
600
#5674A4
oklch(55.6% 0.083 259.5)
-
Step 700
700
#46618C
oklch(49% 0.077 259.4)
-
Step 800
800 (this color)
#42587B
oklch(45.8% 0.064 259.5)
-
Step 900
900
#32425C
oklch(37.7% 0.049 259.9)
-
Step 950
950
#1D2736
oklch(27% 0.031 258.3)
#42587B 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) | #4B5A7D | 0.015 |
| Deuteranopia (no green cones) | #45557A | 0.009 |
| Tritanopia (no blue cones) | #2C6064 | 0.058 |
| Achromatopsia (no color) | #575757 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42587B
#42587B
oklch(45.8% 0.064 259.5)
- #6A532C
#6A532C
oklch(45.7% 0.063 79.3)
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 #42587B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.010
- Dusk #4E5481 ΔE 0.024
- Dusty Grape #545775 ΔE 0.026
- Light Navy Blue #2E5A88 ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.037
- Denim #3B638C ΔE 0.037
- Twilight #4E518B ΔE 0.041
- Dusky Blue #475F94 ΔE 0.043
Use #42587B 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.