#39728D
Closest named color: Metallic Blue (#4F738E). oklch(52.5% 0.073 230.9), rgb(57, 114, 141).
Aa
White text reads best on this color (5.29:1).
About this color
#39728D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.073 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.024 away. White text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #39728D |
| RGB | rgb(57, 114, 141) |
| HSL | hsl(199, 42%, 39%) |
| OKLCH | oklch(52.5% 0.073 230.9) |
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 #39728D | 5.29:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #39728D | 3.96:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #39728D text on white | 5.29:1 | AA | Lc 76.2 | Fine for body text |
| #39728D text on black | 3.96:1 | AA large text | Lc -25.6 | 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 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
#CEDCE3
oklch(88.6% 0.018 229)
-
Step 300
300
#ACC5D2
oklch(80.9% 0.033 230.4)
-
Step 400
400
#7FA7BC
oklch(70.7% 0.053 231.3)
-
Step 500
500
#5E91AB
oklch(63.1% 0.067 231.4)
-
Step 600
600 (this color)
#39728D
oklch(52.5% 0.073 230.9)
-
Step 700
700
#346880
oklch(49.2% 0.068 230.2)
-
Step 800
800
#2C5568
oklch(42.8% 0.056 230)
-
Step 900
900
#284655
oklch(37.7% 0.044 231.3)
-
Step 950
950
#182932
oklch(27% 0.028 232.3)
#39728D 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) | #64708E | 0.050 |
| Deuteranopia (no green cones) | #59688D | 0.044 |
| Tritanopia (no blue cones) | #00797B | 0.050 |
| Achromatopsia (no color) | #6B6B6B | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39728D
#39728D
oklch(52.5% 0.073 230.9)
- #8C5E42
#8C5E42
oklch(52.5% 0.073 51.9)
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 #39728D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.024
- Sea Blue #047495 ΔE 0.027
- Muted Blue #3B719F ΔE 0.030
- Dull Blue #49759C ΔE 0.031
- Ocean #017B92 ΔE 0.033
- Ocean Blue #03719C ΔE 0.035
- Cerulean #457B9D ΔE 0.036
- Deep Aqua #08787F ΔE 0.042
Use #39728D 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.