#3F4665
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.053 274), rgb(63, 70, 101).
Aa
White text reads best on this color (9.22:1).
About this color
#3F4665 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.053 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #3F4665 |
| RGB | rgb(63, 70, 101) |
| HSL | hsl(229, 23%, 32%) |
| OKLCH | oklch(40.2% 0.053 274) |
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 #3F4665 | 9.22:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3F4665 | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #3F4665 text on white | 9.22:1 | AAA | Lc 91.3 | Preferred for body text |
| #3F4665 text on black | 2.27:1 | Fails | Lc -11.1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E8
oklch(88.4% 0.022 274.7)
-
Step 300
300
#B8BFDB
oklch(80.8% 0.04 274.4)
-
Step 400
400
#949EC9
oklch(70.7% 0.064 274.5)
-
Step 500
500
#7A86BB
oklch(63.1% 0.081 274)
-
Step 600
600
#636FA7
oklch(55.6% 0.088 274)
-
Step 700
700
#525D8F
oklch(49.1% 0.081 273.6)
-
Step 800
800
#434C74
oklch(42.7% 0.068 273.5)
-
Step 900
900 (this color)
#3F4665
oklch(40.2% 0.053 274)
-
Step 950
950
#212537
oklch(26.9% 0.034 274.3)
#3F4665 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) | #3C4966 | 0.009 |
| Deuteranopia (no green cones) | #394664 | 0.009 |
| Tritanopia (no blue cones) | #344C51 | 0.047 |
| Achromatopsia (no color) | #474747 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4665
#3F4665
oklch(40.2% 0.053 274)
- #514825
#514825
oklch(40.2% 0.053 95.3)
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 #3F4665, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.059
- YInMn Blue #415A77 ΔE 0.062
- Dusk #4E5481 ΔE 0.063
- Light Navy #155084 ΔE 0.064
- Dusty Grape #545775 ΔE 0.065
Use #3F4665 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.