#3F539D
Closest named color: Denim Blue (#3B5B92). oklch(46.5% 0.122 269.8), rgb(63, 83, 157).
Aa
White text reads best on this color (7.15:1).
About this color
#3F539D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.122 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.031 away. White text reads best on it, at 7.15:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.93:1 |
| White text | 7.15:1 |
Values
| HEX | #3F539D |
| RGB | rgb(63, 83, 157) |
| HSL | hsl(227, 43%, 43%) |
| OKLCH | oklch(46.5% 0.122 269.8) |
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 #3F539D | 7.15:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #3F539D | 2.93:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #3F539D text on white | 7.15:1 | AAA | Lc 84.6 | Fine for body text |
| #3F539D text on black | 2.93:1 | Fails | Lc -17.4 | 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 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E8
oklch(81% 0.059 268.9)
-
Step 400
400
#899EDC
oklch(70.7% 0.094 269.5)
-
Step 500
500
#6D85D2
oklch(63.2% 0.12 269.6)
-
Step 600
600
#556DC0
oklch(55.6% 0.132 269.6)
-
Step 700
700 (this color)
#3F539D
oklch(46.5% 0.122 269.8)
-
Step 800
800
#394A86
oklch(42.6% 0.102 269.8)
-
Step 900
900
#313F6B
oklch(37.8% 0.078 269.1)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#3F539D 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) | #305CA0 | 0.027 |
| Deuteranopia (no green cones) | #22549B | 0.030 |
| Tritanopia (no blue cones) | #006470 | 0.108 |
| Achromatopsia (no color) | #585858 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F539D
#3F539D
oklch(46.5% 0.122 269.8)
- #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 #3F539D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.031
- Twilight #4E518B ΔE 0.034
- Dusk Blue #26538D ΔE 0.039
- Dusky Blue #475F94 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.047
- Blueberry #464196 ΔE 0.047
- Dusk #4E5481 ΔE 0.050
- Cobalt #1E488F ΔE 0.055
Use #3F539D 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.