#3F749E
Closest named color: Muted Blue (#3B719F). oklch(54.1% 0.087 244.3), rgb(63, 116, 158).
Aa
White text reads best on this color (4.99:1).
About this color
#3F749E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.087 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.011 away. White text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #3F749E |
| RGB | rgb(63, 116, 158) |
| HSL | hsl(207, 43%, 43%) |
| OKLCH | oklch(54.1% 0.087 244.3) |
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 #3F749E | 4.99:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #3F749E | 4.20:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #3F749E text on white | 4.99:1 | AA | Lc 74.4 | Content text, not long reading |
| #3F749E text on black | 4.20:1 | AA large text | Lc -27.3 | 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
#80A5C5
oklch(70.6% 0.062 244.9)
-
Step 500
500
#5E8FB7
oklch(63.1% 0.08 244.2)
-
Step 600
600 (this color)
#3F749E
oklch(54.1% 0.087 244.3)
-
Step 700
700
#35658B
oklch(49% 0.081 244.4)
-
Step 800
800
#2C5371
oklch(42.7% 0.067 243.5)
-
Step 900
900
#28455B
oklch(37.8% 0.052 242.6)
-
Step 950
950
#182836
oklch(27% 0.034 245.9)
#3F749E 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) | #6275A0 | 0.041 |
| Deuteranopia (no green cones) | #556B9D | 0.033 |
| Tritanopia (no blue cones) | #007E82 | 0.069 |
| Achromatopsia (no color) | #6F6F6F | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F749E
#3F749E
oklch(54.1% 0.087 244.3)
- #926334
#926334
oklch(54% 0.088 64)
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 #3F749E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.011
- Dull Blue #49759C ΔE 0.011
- Flat Blue #3C73A8 ΔE 0.017
- Cerulean #457B9D ΔE 0.023
- Metallic Blue #4F738E ΔE 0.028
- Stormy Blue #507B9C ΔE 0.030
- Ocean Blue #03719C ΔE 0.036
- Nice Blue #107AB0 ΔE 0.036
Use #3F749E 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.