#42728F
Closest named color: Metallic Blue (#4F738E). oklch(53% 0.069 236.6), rgb(66, 114, 143).
Aa
White text reads best on this color (5.20:1).
About this color
#42728F is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.069 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.015 away. White text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.03:1 |
| White text | 5.20:1 |
Values
| HEX | #42728F |
| RGB | rgb(66, 114, 143) |
| HSL | hsl(203, 37%, 41%) |
| OKLCH | oklch(53% 0.069 236.6) |
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 #42728F | 5.20:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #42728F | 4.03:1 | AA large text | Lc 28.4 | Dividers and decoration only |
| #42728F text on white | 5.20:1 | AA | Lc 75.7 | Fine for body text |
| #42728F text on black | 4.03:1 | AA large text | Lc -26.0 | 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 600.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AEC4D3
oklch(80.8% 0.032 237.7)
-
Step 400
400
#83A6BC
oklch(70.7% 0.05 236)
-
Step 500
500
#6390AB
oklch(63.1% 0.064 235.5)
-
Step 600
600 (this color)
#42728F
oklch(53% 0.069 236.6)
-
Step 700
700
#3A6681
oklch(49% 0.065 237.1)
-
Step 800
800
#315469
oklch(42.9% 0.054 236.2)
-
Step 900
900
#2B4555
oklch(37.6% 0.042 236.5)
-
Step 950
950
#1A2932
oklch(27.2% 0.026 235.4)
#42728F 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) | #657190 | 0.043 |
| Deuteranopia (no green cones) | #5A698F | 0.036 |
| Tritanopia (no blue cones) | #13797C | 0.053 |
| Achromatopsia (no color) | #6D6D6D | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42728F
#42728F
oklch(53% 0.069 236.6)
- #8B6143
#8B6143
oklch(53% 0.07 56.1)
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 #42728F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.015
- Dull Blue #49759C ΔE 0.023
- Muted Blue #3B719F ΔE 0.027
- Cerulean #457B9D ΔE 0.031
- Sea Blue #047495 ΔE 0.034
- Stormy Blue #507B9C ΔE 0.036
- Ocean #017B92 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.039
Use #42728F 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.