#3F5571
Closest named color: YInMn Blue (#415A77). oklch(44.4% 0.054 254.8), rgb(63, 85, 113).
Aa
White text reads best on this color (7.63:1).
About this color
#3F5571 is a dark, muted blue. In OKLCH its lightness is 44%, its chroma 0.054 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.017 away. White text reads best on it, at 7.63:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.74:1 |
| White text | 7.63:1 |
Values
| HEX | #3F5571 |
| RGB | rgb(63, 85, 113) |
| HSL | hsl(214, 28%, 35%) |
| OKLCH | oklch(44.4% 0.054 254.8) |
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 #3F5571 | 7.63:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #3F5571 | 2.74:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #3F5571 text on white | 7.63:1 | AAA | Lc 86.5 | Fine for body text |
| #3F5571 text on black | 2.74:1 | Fails | Lc -15.6 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B3C2D5
oklch(80.9% 0.032 254.3)
-
Step 400
400
#8CA3C0
oklch(70.8% 0.05 254.4)
-
Step 500
500
#6F8CB0
oklch(63.2% 0.064 254.1)
-
Step 600
600
#57759C
oklch(55.5% 0.07 255.3)
-
Step 700
700
#476285
oklch(49% 0.065 255.2)
-
Step 800
800 (this color)
#3F5571
oklch(44.4% 0.054 254.8)
-
Step 900
900
#324358
oklch(37.7% 0.042 254.1)
-
Step 950
950
#1E2733
oklch(27% 0.026 255.7)
#3F5571 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) | #4A5672 | 0.016 |
| Deuteranopia (no green cones) | #455170 | 0.013 |
| Tritanopia (no blue cones) | #2D5B5F | 0.046 |
| Achromatopsia (no color) | #535353 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5571
#3F5571
oklch(44.4% 0.054 254.8)
- #654F31
#654F31
oklch(44.3% 0.053 74.3)
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 #3F5571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.017
- Dusty Grape #545775 ΔE 0.032
- Dusk #4E5481 ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.039
- Denim #3B638C ΔE 0.053
- Twilight #4E518B ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.053
Use #3F5571 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.