#42728B
Closest named color: Metallic Blue (#4F738E). oklch(52.8% 0.065 232.6), rgb(66, 114, 139).
Aa
White text reads best on this color (5.23:1).
About this color
#42728B is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.065 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.016 away. White text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #42728B |
| RGB | rgb(66, 114, 139) |
| HSL | hsl(201, 36%, 40%) |
| OKLCH | oklch(52.8% 0.065 232.6) |
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 #42728B | 5.23:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #42728B | 4.01:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #42728B text on white | 5.23:1 | AA | Lc 75.9 | Fine for body text |
| #42728B text on black | 4.01:1 | AA large text | Lc -25.9 | 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
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AFC4D1
oklch(80.9% 0.029 234.9)
-
Step 400
400
#84A6B9
oklch(70.6% 0.047 232.8)
-
Step 500
500
#6490A8
oklch(63% 0.06 232.8)
-
Step 600
600 (this color)
#42728B
oklch(52.8% 0.065 232.6)
-
Step 700
700
#3B677E
oklch(49.2% 0.061 232.7)
-
Step 800
800
#315466
oklch(42.7% 0.05 232)
-
Step 900
900
#2C4553
oklch(37.6% 0.039 233.8)
-
Step 950
950
#1A2931
oklch(27.1% 0.025 232.2)
#42728B 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) | #66718C | 0.044 |
| Deuteranopia (no green cones) | #5C698B | 0.039 |
| Tritanopia (no blue cones) | #18797A | 0.050 |
| Achromatopsia (no color) | #6C6C6C | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42728B
#42728B
oklch(52.8% 0.065 232.6)
- #8A6147
#8A6147
oklch(52.9% 0.066 53.2)
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 #42728B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.016
- Dull Blue #49759C ΔE 0.029
- Muted Blue #3B719F ΔE 0.033
- Cerulean #457B9D ΔE 0.035
- Sea Blue #047495 ΔE 0.036
- Ocean #017B92 ΔE 0.038
- Stormy Blue #507B9C ΔE 0.039
- Ocean Blue #03719C ΔE 0.044
Use #42728B 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.