#3F4F87
Closest named color: Twilight (#4E518B). oklch(44.2% 0.094 270.2), rgb(63, 79, 135).
Aa
White text reads best on this color (7.83:1).
About this color
#3F4F87 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.094 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.024 away. White text reads best on it, at 7.83:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.67:1 |
| White text | 7.83:1 |
Values
| HEX | #3F4F87 |
| RGB | rgb(63, 79, 135) |
| HSL | hsl(227, 36%, 39%) |
| OKLCH | oklch(44.2% 0.094 270.2) |
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 #3F4F87 | 7.83:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3F4F87 | 2.67:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3F4F87 text on white | 7.83:1 | AAA | Lc 87.1 | Fine for body text |
| #3F4F87 text on black | 2.67:1 | Fails | Lc -15.0 | Dividers and decoration only |
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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3C0E5
oklch(81% 0.054 269.9)
-
Step 400
400
#8B9ED8
oklch(70.7% 0.088 270.1)
-
Step 500
500
#6F85CE
oklch(63.1% 0.113 270.2)
-
Step 600
600
#586EBB
oklch(55.7% 0.122 270)
-
Step 700
700
#485BA1
oklch(49% 0.114 270.3)
-
Step 800
800 (this color)
#3F4F87
oklch(44.2% 0.094 270.2)
-
Step 900
900
#333F69
oklch(37.8% 0.074 270.5)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#3F4F87 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) | #395589 | 0.018 |
| Deuteranopia (no green cones) | #314F86 | 0.018 |
| Tritanopia (no blue cones) | #1E5B64 | 0.085 |
| Achromatopsia (no color) | #525252 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F87
#3F4F87
oklch(44.2% 0.094 270.2)
- #665000
#665000
oklch(44.1% 0.09 90.4)
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 #3F4F87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.024
- Dusk Blue #26538D ΔE 0.028
- Dusk #4E5481 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.035
- Light Navy #155084 ΔE 0.041
- Cobalt #1E488F ΔE 0.047
- YInMn Blue #415A77 ΔE 0.048
Use #3F4F87 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.