#3F539B
Closest named color: Denim Blue (#3B5B92). oklch(46.4% 0.119 269.6), rgb(63, 83, 155).
Aa
White text reads best on this color (7.18:1).
About this color
#3F539B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.119 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.029 away. White text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #3F539B |
| RGB | rgb(63, 83, 155) |
| HSL | hsl(227, 42%, 43%) |
| OKLCH | oklch(46.4% 0.119 269.6) |
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 #3F539B | 7.18:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #3F539B | 2.92:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #3F539B text on white | 7.18:1 | AAA | Lc 84.7 | Fine for body text |
| #3F539B text on black | 2.92:1 | Fails | Lc -17.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B2C0E7
oklch(81% 0.057 269.6)
-
Step 400
400
#8A9EDB
oklch(70.7% 0.093 270)
-
Step 500
500
#6D85D1
oklch(63.1% 0.118 269.5)
-
Step 600
600
#566DBE
oklch(55.5% 0.129 269.9)
-
Step 700
700 (this color)
#3F539B
oklch(46.4% 0.119 269.6)
-
Step 800
800
#3A4B85
oklch(42.8% 0.098 269.6)
-
Step 900
900
#313F6A
oklch(37.7% 0.076 268.9)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#3F539B 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) | #325C9E | 0.026 |
| Deuteranopia (no green cones) | #245499 | 0.028 |
| Tritanopia (no blue cones) | #00636F | 0.106 |
| Achromatopsia (no color) | #575757 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F539B
#3F539B
oklch(46.4% 0.119 269.6)
- #6E5600
#6E5600
oklch(46.5% 0.095 89.9)
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 #3F539B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.029
- Twilight #4E518B ΔE 0.032
- Dusk Blue #26538D ΔE 0.037
- Dusky Blue #475F94 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.044
- Blueberry #464196 ΔE 0.047
- Dusk #4E5481 ΔE 0.047
- Cobalt #1E488F ΔE 0.054
Use #3F539B 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.