#3F4569
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.061 276), rgb(63, 69, 105).
Aa
White text reads best on this color (9.26:1).
About this color
#3F4569 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.061 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.040 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #3F4569 |
| RGB | rgb(63, 69, 105) |
| HSL | hsl(231, 25%, 33%) |
| OKLCH | oklch(40.1% 0.061 276) |
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 #3F4569 | 9.26:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #3F4569 | 2.26:1 | Fails | Lc 12.6 | Not readable |
| #3F4569 text on white | 9.26:1 | AAA | Lc 91.3 | Preferred for body text |
| #3F4569 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B8BFDF
oklch(81% 0.046 275.6)
-
Step 400
400
#949DCF
oklch(70.7% 0.074 276.4)
-
Step 500
500
#7A84C2
oklch(63% 0.094 276.3)
-
Step 600
600
#636DAF
oklch(55.6% 0.103 276)
-
Step 700
700
#525B96
oklch(49.1% 0.095 275.8)
-
Step 800
800
#434B7A
oklch(42.8% 0.079 275.2)
-
Step 900
900 (this color)
#3F4569
oklch(40.1% 0.061 276)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#3F4569 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) | #39496A | 0.014 |
| Deuteranopia (no green cones) | #364668 | 0.013 |
| Tritanopia (no blue cones) | #334C52 | 0.054 |
| Achromatopsia (no color) | #474747 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4569
#3F4569
oklch(40.1% 0.061 276)
- #52481E
#52481E
oklch(40.2% 0.061 96.1)
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 #3F4569, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.054
- Light Navy #155084 ΔE 0.060
- Dusk #4E5481 ΔE 0.061
- Twilight Blue #0A437A ΔE 0.061
- YInMn Blue #415A77 ΔE 0.063
- Charcoal Grey #3C4142 ΔE 0.066
- Dusty Grape #545775 ΔE 0.066
Use #3F4569 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.