#3F446E
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.071 277.5), rgb(63, 68, 110).
Aa
White text reads best on this color (9.27:1).
About this color
#3F446E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.071 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.047 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #3F446E |
| RGB | rgb(63, 68, 110) |
| HSL | hsl(234, 27%, 34%) |
| OKLCH | oklch(40.2% 0.071 277.5) |
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 #3F446E | 9.27:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #3F446E | 2.26:1 | Fails | Lc 12.6 | Not readable |
| #3F446E text on white | 9.27:1 | AAA | Lc 91.4 | Preferred for body text |
| #3F446E text on black | 2.26:1 | Fails | Lc -11.0 | 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
#D4D8ED
oklch(88.6% 0.029 277.2)
-
Step 300
300
#B8BEE3
oklch(80.9% 0.053 277.9)
-
Step 400
400
#939CD6
oklch(70.7% 0.085 277.2)
-
Step 500
500
#7A82CA
oklch(63% 0.108 278)
-
Step 600
600
#636BB7
oklch(55.6% 0.118 277.3)
-
Step 700
700
#52599E
oklch(49.1% 0.11 277.2)
-
Step 800
800
#434980
oklch(42.7% 0.091 277.1)
-
Step 900
900 (this color)
#3F446E
oklch(40.2% 0.071 277.5)
-
Step 950
950
#21243C
oklch(27% 0.045 277.5)
#3F446E 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) | #364970 | 0.018 |
| Deuteranopia (no green cones) | #32456D | 0.019 |
| Tritanopia (no blue cones) | #304C54 | 0.061 |
| Achromatopsia (no color) | #474747 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F446E
#3F446E
oklch(40.2% 0.071 277.5)
- #534814
#534814
oklch(40.2% 0.071 97)
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 #3F446E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.057
- Dusk #4E5481 ΔE 0.059
- Charcoal #264653 ΔE 0.061
- Twilight #4E518B ΔE 0.062
- Dusk Blue #26538D ΔE 0.063
Use #3F446E 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.