#3F5291
Closest named color: Twilight (#4E518B). oklch(45.5% 0.105 269.3), rgb(63, 82, 145).
Aa
White text reads best on this color (7.42:1).
About this color
#3F5291 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.105 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.022 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #3F5291 |
| RGB | rgb(63, 82, 145) |
| HSL | hsl(226, 39%, 41%) |
| OKLCH | oklch(45.5% 0.105 269.3) |
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 #3F5291 | 7.42:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #3F5291 | 2.82:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #3F5291 text on white | 7.42:1 | AAA | Lc 85.7 | Fine for body text |
| #3F5291 text on black | 2.82:1 | Fails | Lc -16.4 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F1
oklch(88.6% 0.034 269.3)
-
Step 300
300
#B0C0E9
oklch(80.9% 0.061 268.3)
-
Step 400
400
#889EDF
oklch(70.8% 0.099 269.4)
-
Step 500
500
#6B84D6
oklch(63% 0.127 269.7)
-
Step 600
600
#536DC3
oklch(55.7% 0.137 269)
-
Step 700
700
#445AA8
oklch(49% 0.127 269.4)
-
Step 800
800 (this color)
#3F5291
oklch(45.5% 0.105 269.3)
-
Step 900
900
#303E6D
oklch(37.6% 0.083 269.6)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#3F5291 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) | #375993 | 0.020 |
| Deuteranopia (no green cones) | #2D5290 | 0.021 |
| Tritanopia (no blue cones) | #10606A | 0.095 |
| Achromatopsia (no color) | #555555 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5291
#3F5291
oklch(45.5% 0.105 269.3)
- #6B5300
#6B5300
oklch(45.4% 0.093 89.3)
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 #3F5291, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.025
- Dusk Blue #26538D ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.034
- Dusk #4E5481 ΔE 0.035
- Dusky Blue #475F94 ΔE 0.040
- Blueberry #464196 ΔE 0.047
- Light Navy #155084 ΔE 0.048
Use #3F5291 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.