#42587C
Closest named color: YInMn Blue (#415A77). oklch(45.8% 0.065 260), rgb(66, 88, 124).
Aa
White text reads best on this color (7.19:1).
About this color
#42587C is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.065 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.012 away. White text reads best on it, at 7.19:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.91:1 |
| White text | 7.19:1 |
Values
| HEX | #42587C |
| RGB | rgb(66, 88, 124) |
| HSL | hsl(217, 31%, 37%) |
| OKLCH | oklch(45.8% 0.065 260) |
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 #42587C | 7.19:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #42587C | 2.91:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #42587C text on white | 7.19:1 | AAA | Lc 84.9 | Fine for body text |
| #42587C text on black | 2.91:1 | Fails | Lc -17.1 | 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 800.
-
Step 50
50
#F3F5F9
oklch(97% 0.006 264.5)
-
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
#B3C2DA
oklch(81% 0.038 259.8)
-
Step 400
400
#8BA2C7
oklch(70.8% 0.06 259.8)
-
Step 500
500
#6E8AB9
oklch(63% 0.078 260.6)
-
Step 600
600
#5674A5
oklch(55.7% 0.084 259.9)
-
Step 700
700
#46618D
oklch(49.1% 0.078 259.9)
-
Step 800
800 (this color)
#42587C
oklch(45.8% 0.065 260)
-
Step 900
900
#32425D
oklch(37.8% 0.051 260.6)
-
Step 950
950
#1D2736
oklch(27% 0.031 258.3)
#42587C 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) | #4B5A7E | 0.015 |
| Deuteranopia (no green cones) | #44557B | 0.009 |
| Tritanopia (no blue cones) | #2C6065 | 0.058 |
| Achromatopsia (no color) | #575757 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42587C
#42587C
oklch(45.8% 0.065 260)
- #6B532B
#6B532B
oklch(45.8% 0.065 78.8)
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 #42587C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.012
- Dusk #4E5481 ΔE 0.023
- Dusty Grape #545775 ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.035
- Denim #3B638C ΔE 0.036
- Twilight #4E518B ΔE 0.039
- Dusky Blue #475F94 ΔE 0.042
Use #42587C 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.