#3F5186
Closest named color: Twilight (#4E518B). oklch(44.6% 0.09 268.4), rgb(63, 81, 134).
Aa
White text reads best on this color (7.68:1).
About this color
#3F5186 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.090 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.023 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #3F5186 |
| RGB | rgb(63, 81, 134) |
| HSL | hsl(225, 36%, 39%) |
| OKLCH | oklch(44.6% 0.09 268.4) |
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 #3F5186 | 7.68:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #3F5186 | 2.73:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #3F5186 text on white | 7.68:1 | AAA | Lc 86.6 | Fine for body text |
| #3F5186 text on black | 2.73:1 | Fails | Lc -15.5 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8A9FD6
oklch(70.7% 0.084 268.1)
-
Step 500
500
#6E86CB
oklch(63.1% 0.108 268.6)
-
Step 600
600
#566FB8
oklch(55.6% 0.117 268.2)
-
Step 700
700
#475C9E
oklch(49% 0.109 268.8)
-
Step 800
800 (this color)
#3F5186
oklch(44.6% 0.09 268.4)
-
Step 900
900
#323F67
oklch(37.6% 0.071 269.2)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#3F5186 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) | #3C5688 | 0.014 |
| Deuteranopia (no green cones) | #345085 | 0.015 |
| Tritanopia (no blue cones) | #1F5C65 | 0.080 |
| Achromatopsia (no color) | #535353 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5186
#3F5186
oklch(44.6% 0.09 268.4)
- #695002
#695002
oklch(44.5% 0.09 87.5)
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 #3F5186, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.023
- Dusk #4E5481 ΔE 0.026
- Dusk Blue #26538D ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.031
- YInMn Blue #415A77 ΔE 0.041
- Light Navy #155084 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.045
Use #3F5186 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.