#3F588F
Closest named color: Denim Blue (#3B5B92). oklch(46.7% 0.095 264.5), rgb(63, 88, 143).
Aa
White text reads best on this color (6.99:1).
About this color
#3F588F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.095 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.009 away. White text reads best on it, at 6.99:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.00:1 |
| White text | 6.99:1 |
Values
| HEX | #3F588F |
| RGB | rgb(63, 88, 143) |
| HSL | hsl(221, 39%, 40%) |
| OKLCH | oklch(46.7% 0.095 264.5) |
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 #3F588F | 6.99:1 | AA | Lc -89.0 | Fine for body text |
| Black text on #3F588F | 3.00:1 | AA large text | Lc 20.0 | Dividers and decoration only |
| #3F588F text on white | 6.99:1 | AA | Lc 84.1 | Fine for body text |
| #3F588F text on black | 3.00:1 | AA large text | Lc -17.9 | 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
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C1DF
oklch(80.9% 0.046 264.3)
-
Step 400
400
#8AA0CF
oklch(70.6% 0.074 265.1)
-
Step 500
500
#6D88C3
oklch(63% 0.095 265)
-
Step 600
600
#5572AF
oklch(55.7% 0.101 264.1)
-
Step 700
700 (this color)
#3F588F
oklch(46.7% 0.095 264.5)
-
Step 800
800
#394E7A
oklch(42.8% 0.078 264)
-
Step 900
900
#314162
oklch(37.7% 0.061 264)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#3F588F 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) | #425D91 | 0.015 |
| Deuteranopia (no green cones) | #38568E | 0.011 |
| Tritanopia (no blue cones) | #11646C | 0.086 |
| Achromatopsia (no color) | #595959 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F588F
#3F588F
oklch(46.7% 0.095 264.5)
- #725503
#725503
oklch(46.7% 0.095 85.3)
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 #3F588F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.009
- Light Navy Blue #2E5A88 ΔE 0.023
- Dusky Blue #475F94 ΔE 0.024
- Twilight #4E518B ΔE 0.026
- Dusk #4E5481 ΔE 0.029
- Dusk Blue #26538D ΔE 0.033
- Denim #3B638C ΔE 0.034
- YInMn Blue #415A77 ΔE 0.042
Use #3F588F 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.