#3F729E
Closest named color: Muted Blue (#3B719F). oklch(53.6% 0.089 246.4), rgb(63, 114, 158).
Aa
White text reads best on this color (5.10:1).
About this color
#3F729E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.089 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.006 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #3F729E |
| RGB | rgb(63, 114, 158) |
| HSL | hsl(208, 43%, 43%) |
| OKLCH | oklch(53.6% 0.089 246.4) |
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 #3F729E | 5.10:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #3F729E | 4.11:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #3F729E text on white | 5.10:1 | AA | Lc 75.1 | Fine for body text |
| #3F729E text on black | 4.11:1 | AA large text | Lc -26.7 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#ACC4D9
oklch(80.9% 0.04 244.7)
-
Step 400
400
#80A5C7
oklch(70.7% 0.064 246.6)
-
Step 500
500
#5F8EB8
oklch(63% 0.082 246.5)
-
Step 600
600 (this color)
#3F729E
oklch(53.6% 0.089 246.4)
-
Step 700
700
#36658D
oklch(49.2% 0.083 246.2)
-
Step 800
800
#2D5272
oklch(42.6% 0.068 246.4)
-
Step 900
900
#29445C
oklch(37.6% 0.053 246.6)
-
Step 950
950
#182836
oklch(27% 0.034 245.9)
#3F729E 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) | #5F73A0 | 0.038 |
| Deuteranopia (no green cones) | #526A9D | 0.029 |
| Tritanopia (no blue cones) | #007C81 | 0.071 |
| Achromatopsia (no color) | #6E6E6E | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F729E
#3F729E
oklch(53.6% 0.089 246.4)
- #906230
#906230
oklch(53.5% 0.089 66.1)
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 #3F729E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.006
- Dull Blue #49759C ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.015
- Cerulean #457B9D ΔE 0.029
- Metallic Blue #4F738E ΔE 0.030
- Ocean Blue #03719C ΔE 0.034
- Stormy Blue #507B9C ΔE 0.035
- French Blue #436BAD ΔE 0.035
Use #3F729E 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.