#3F446C
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.068 277.5), rgb(63, 68, 108).
Aa
White text reads best on this color (9.31:1).
About this color
#3F446C is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.068 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.045 away. White text reads best on it, at 9.31:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #3F446C |
| RGB | rgb(63, 68, 108) |
| HSL | hsl(233, 26%, 34%) |
| OKLCH | oklch(40.1% 0.068 277.5) |
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 #3F446C | 9.31:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #3F446C | 2.25:1 | Fails | Lc 12.5 | Not readable |
| #3F446C text on white | 9.31:1 | AAA | Lc 91.5 | Preferred for body text |
| #3F446C text on black | 2.25:1 | Fails | Lc -10.9 | 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 900.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8EC
oklch(88.5% 0.028 276.8)
-
Step 300
300
#B8BEE2
oklch(80.9% 0.051 277.7)
-
Step 400
400
#949CD3
oklch(70.7% 0.081 277.7)
-
Step 500
500
#7A83C8
oklch(63.1% 0.104 277.3)
-
Step 600
600
#646CB4
oklch(55.7% 0.112 277.3)
-
Step 700
700
#53599B
oklch(49% 0.105 277.8)
-
Step 800
800
#44497E
oklch(42.7% 0.088 277.9)
-
Step 900
900 (this color)
#3F446C
oklch(40.1% 0.068 277.5)
-
Step 950
950
#21243B
oklch(26.9% 0.043 277.4)
#3F446C 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) | #37496E | 0.017 |
| Deuteranopia (no green cones) | #34456B | 0.016 |
| Tritanopia (no blue cones) | #314C53 | 0.060 |
| Achromatopsia (no color) | #474747 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F446C
#3F446C
oklch(40.1% 0.068 277.5)
- #524818
#524818
oklch(40.1% 0.067 97.5)
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 #3F446C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.045
- Twilight Blue #0A437A ΔE 0.058
- Charcoal #264653 ΔE 0.059
- Light Navy #155084 ΔE 0.059
- Dusk #4E5481 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.060
- Twilight #4E518B ΔE 0.065
- Dusk Blue #26538D ΔE 0.065
Use #3F446C 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.