#3F4E6B
Closest named color: YInMn Blue (#415A77). oklch(42.4% 0.052 263.2), rgb(63, 78, 107).
Aa
White text reads best on this color (8.35:1).
About this color
#3F4E6B is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.052 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.038 away. White text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #3F4E6B |
| RGB | rgb(63, 78, 107) |
| HSL | hsl(220, 26%, 33%) |
| OKLCH | oklch(42.4% 0.052 263.2) |
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 #3F4E6B | 8.35:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #3F4E6B | 2.51:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #3F4E6B text on white | 8.35:1 | AAA | Lc 88.8 | Fine for body text |
| #3F4E6B text on black | 2.51:1 | Fails | Lc -13.4 | Not readable |
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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B6C1D5
oklch(80.9% 0.031 262.5)
-
Step 400
400
#91A1C0
oklch(70.7% 0.049 263.6)
-
Step 500
500
#768AB0
oklch(63.2% 0.062 263)
-
Step 600
600
#5E739C
oklch(55.5% 0.069 263.3)
-
Step 700
700
#4E6185
oklch(49.2% 0.063 262.8)
-
Step 800
800 (this color)
#3F4E6B
oklch(42.4% 0.052 263.2)
-
Step 900
900
#364258
oklch(37.8% 0.041 262.3)
-
Step 950
950
#202633
oklch(26.9% 0.026 265.4)
#3F4E6B 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) | #44506C | 0.010 |
| Deuteranopia (no green cones) | #3F4C6A | 0.006 |
| Tritanopia (no blue cones) | #315458 | 0.046 |
| Achromatopsia (no color) | #4E4E4E | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E6B
#3F4E6B
oklch(42.4% 0.052 263.2)
- #5C4C2C
#5C4C2C
oklch(42.5% 0.052 83.7)
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 #3F4E6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.038
- Dusty Grape #545775 ΔE 0.045
- Dusk #4E5481 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.053
- Light Navy #155084 ΔE 0.055
- Dark Slate Gray #2F4F4F ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.057
Use #3F4E6B 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.