#3F4972
Closest named color: Dusk (#4E5481). oklch(41.6% 0.07 272.6), rgb(63, 73, 114).
Aa
White text reads best on this color (8.72:1).
About this color
#3F4972 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.070 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.045 away. White text reads best on it, at 8.72:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.40:1 |
| White text | 8.72:1 |
Values
| HEX | #3F4972 |
| RGB | rgb(63, 73, 114) |
| HSL | hsl(228, 29%, 35%) |
| OKLCH | oklch(41.6% 0.07 272.6) |
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 #3F4972 | 8.72:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #3F4972 | 2.40:1 | Fails | Lc 14.1 | Not readable |
| #3F4972 text on white | 8.72:1 | AAA | Lc 89.8 | Fine for body text |
| #3F4972 text on black | 2.40:1 | Fails | Lc -12.4 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D9E9
oklch(88.6% 0.023 272)
-
Step 300
300
#B7C0DC
oklch(81% 0.041 271.4)
-
Step 400
400
#929FCA
oklch(70.8% 0.065 271.6)
-
Step 500
500
#7886BC
oklch(63% 0.083 272.7)
-
Step 600
600
#616FA9
oklch(55.5% 0.092 272.8)
-
Step 700
700
#515D91
oklch(49.2% 0.085 273)
-
Step 800
800 (this color)
#3F4972
oklch(41.6% 0.07 272.6)
-
Step 900
900
#38405F
oklch(37.8% 0.054 272.5)
-
Step 950
950
#212537
oklch(26.9% 0.034 274.3)
#3F4972 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) | #3B4D74 | 0.012 |
| Deuteranopia (no green cones) | #364971 | 0.013 |
| Tritanopia (no blue cones) | #2E5158 | 0.062 |
| Achromatopsia (no color) | #4B4B4B | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4972
#3F4972
oklch(41.6% 0.07 272.6)
- #594B19
#594B19
oklch(41.6% 0.07 93.4)
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 #3F4972, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.045
- Light Navy #155084 ΔE 0.049
- YInMn Blue #415A77 ΔE 0.051
- Twilight #4E518B ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.051
- Dusk Blue #26538D ΔE 0.052
- Dusty Grape #545775 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
Use #3F4972 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.