#3F4877
Closest named color: Dusk (#4E5481). oklch(41.6% 0.079 274.2), rgb(63, 72, 119).
Aa
White text reads best on this color (8.73:1).
About this color
#3F4877 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.079 and its hue 274°. 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 8.73:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.40:1 |
| White text | 8.73:1 |
Values
| HEX | #3F4877 |
| RGB | rgb(63, 72, 119) |
| HSL | hsl(230, 31%, 36%) |
| OKLCH | oklch(41.6% 0.079 274.2) |
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 #3F4877 | 8.73:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #3F4877 | 2.40:1 | Fails | Lc 14.1 | Not readable |
| #3F4877 text on white | 8.73:1 | AAA | Lc 89.8 | Fine for body text |
| #3F4877 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B7BFDF
oklch(80.9% 0.046 274.3)
-
Step 400
400
#929ECF
oklch(70.8% 0.073 273.7)
-
Step 500
500
#7885C3
oklch(63.1% 0.095 274.3)
-
Step 600
600
#616EAF
oklch(55.6% 0.102 274)
-
Step 700
700
#505C97
oklch(49.2% 0.096 273.7)
-
Step 800
800 (this color)
#3F4877
oklch(41.6% 0.079 274.2)
-
Step 900
900
#373F62
oklch(37.7% 0.061 273.3)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#3F4877 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) | #374D79 | 0.017 |
| Deuteranopia (no green cones) | #324976 | 0.018 |
| Tritanopia (no blue cones) | #2B525A | 0.070 |
| Achromatopsia (no color) | #4B4B4B | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4877
#3F4877
oklch(41.6% 0.079 274.2)
- #5A4B0C
#5A4B0C
oklch(41.6% 0.079 94.6)
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 #3F4877, 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 0.047
- Twilight #4E518B ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.050
- Cobalt #1E488F ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.055
- YInMn Blue #415A77 ΔE 0.055
Use #3F4877 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.