#3F558F
Closest named color: Denim Blue (#3B5B92). oklch(46% 0.099 266.9), rgb(63, 85, 143).
Aa
White text reads best on this color (7.22:1).
About this color
#3F558F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.099 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.017 away. White text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.90:1 |
| White text | 7.22:1 |
Values
| HEX | #3F558F |
| RGB | rgb(63, 85, 143) |
| HSL | hsl(224, 39%, 40%) |
| OKLCH | oklch(46% 0.099 266.9) |
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 #3F558F | 7.22:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #3F558F | 2.90:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #3F558F text on white | 7.22:1 | AAA | Lc 84.9 | Fine for body text |
| #3F558F text on black | 2.90:1 | Fails | Lc -17.1 | 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 700.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B3C0E0
oklch(80.8% 0.047 267.8)
-
Step 400
400
#8BA0D1
oklch(70.8% 0.076 266.5)
-
Step 500
500
#6F87C5
oklch(63% 0.098 267.4)
-
Step 600
600
#5770B1
oklch(55.5% 0.106 267)
-
Step 700
700 (this color)
#3F558F
oklch(46% 0.099 266.9)
-
Step 800
800
#3B4D7C
oklch(42.8% 0.082 267.1)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#3F558F 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) | #3D5B91 | 0.017 |
| Deuteranopia (no green cones) | #34548E | 0.014 |
| Tritanopia (no blue cones) | #13626B | 0.089 |
| Achromatopsia (no color) | #575757 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F558F
#3F558F
oklch(46% 0.099 266.9)
- #6F5400
#6F5400
oklch(46.1% 0.094 87)
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 #3F558F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.017
- Twilight #4E518B ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.027
- Dusk Blue #26538D ΔE 0.029
- Dusk #4E5481 ΔE 0.029
- Dusky Blue #475F94 ΔE 0.032
- Denim #3B638C ΔE 0.042
- YInMn Blue #415A77 ΔE 0.046
Use #3F558F 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.