#3F5399
Closest named color: Denim Blue (#3B5B92). oklch(46.2% 0.116 269.5), rgb(63, 83, 153).
Aa
White text reads best on this color (7.21:1).
About this color
#3F5399 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.116 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.027 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.90:1 |
| White text | 7.21:1 |
Values
| HEX | #3F5399 |
| RGB | rgb(63, 83, 153) |
| HSL | hsl(227, 42%, 42%) |
| OKLCH | oklch(46.2% 0.116 269.5) |
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 #3F5399 | 7.21:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #3F5399 | 2.90:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #3F5399 text on white | 7.21:1 | AAA | Lc 84.9 | Fine for body text |
| #3F5399 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8A9ED9
oklch(70.6% 0.09 269.6)
-
Step 500
500
#6E85CF
oklch(63.1% 0.115 269.8)
-
Step 600
600
#566EBC
oklch(55.6% 0.124 269.2)
-
Step 700
700 (this color)
#3F5399
oklch(46.2% 0.116 269.5)
-
Step 800
800
#3A4B83
oklch(42.7% 0.095 269.3)
-
Step 900
900
#323F69
oklch(37.7% 0.074 269.6)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#3F5399 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) | #335B9C | 0.024 |
| Deuteranopia (no green cones) | #275398 | 0.026 |
| Tritanopia (no blue cones) | #00636E | 0.105 |
| Achromatopsia (no color) | #575757 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5399
#3F5399
oklch(46.2% 0.116 269.5)
- #6E5500
#6E5500
oklch(46.2% 0.094 88.9)
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 #3F5399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.027
- Twilight #4E518B ΔE 0.029
- Dusk Blue #26538D ΔE 0.035
- Dusky Blue #475F94 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.042
- Dusk #4E5481 ΔE 0.044
- Blueberry #464196 ΔE 0.047
- Cobalt #1E488F ΔE 0.053
Use #3F5399 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.