#42556D
Closest named color: YInMn Blue (#415A77). oklch(44.4% 0.046 254.5), rgb(66, 85, 109).
Aa
White text reads best on this color (7.63:1).
About this color
#42556D is a dark, muted blue. In OKLCH its lightness is 44%, its chroma 0.046 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.019 away. White text reads best on it, at 7.63:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.75:1 |
| White text | 7.63:1 |
Values
| HEX | #42556D |
| RGB | rgb(66, 85, 109) |
| HSL | hsl(213, 25%, 34%) |
| OKLCH | oklch(44.4% 0.046 254.5) |
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 #42556D | 7.63:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #42556D | 2.75:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #42556D text on white | 7.63:1 | AAA | Lc 86.5 | Fine for body text |
| #42556D text on black | 2.75:1 | Fails | Lc -15.6 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B5C2D2
oklch(80.9% 0.027 253.6)
-
Step 400
400
#8FA2BC
oklch(70.6% 0.044 256.3)
-
Step 500
500
#738CAB
oklch(63.2% 0.055 254)
-
Step 600
600
#5B7596
oklch(55.5% 0.06 254.7)
-
Step 700
700
#4B6280
oklch(49% 0.056 255.3)
-
Step 800
800 (this color)
#42556D
oklch(44.4% 0.046 254.5)
-
Step 900
900
#354355
oklch(37.8% 0.036 254.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#42556D 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) | #4C566E | 0.015 |
| Deuteranopia (no green cones) | #47526C | 0.011 |
| Tritanopia (no blue cones) | #345A5D | 0.040 |
| Achromatopsia (no color) | #545454 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42556D
#42556D
oklch(44.4% 0.046 254.5)
- #635036
#635036
oklch(44.4% 0.047 74.8)
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 #42556D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.019
- Dusty Grape #545775 ΔE 0.031
- Dusk #4E5481 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.046
- Slate #516572 ΔE 0.055
- Petrol #005F6A ΔE 0.055
- Denim #3B638C ΔE 0.057
- Twilight #4E518B ΔE 0.058
Use #42556D 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.