#3F588A
Closest named color: Denim Blue (#3B5B92). oklch(46.4% 0.087 263.2), rgb(63, 88, 138).
Aa
White text reads best on this color (7.06:1).
About this color
#3F588A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.087 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.014 away. White text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.97:1 |
| White text | 7.06:1 |
Values
| HEX | #3F588A |
| RGB | rgb(63, 88, 138) |
| HSL | hsl(220, 37%, 39%) |
| OKLCH | oklch(46.4% 0.087 263.2) |
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 #3F588A | 7.06:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #3F588A | 2.97:1 | Fails | Lc 19.7 | Dividers and decoration only |
| #3F588A text on white | 7.06:1 | AAA | Lc 84.4 | Fine for body text |
| #3F588A text on black | 2.97:1 | Fails | Lc -17.6 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D1D9E9
oklch(88.4% 0.024 264.4)
-
Step 300
300
#B2C1DD
oklch(80.9% 0.043 263)
-
Step 400
400
#8BA1CC
oklch(70.8% 0.068 263.6)
-
Step 500
500
#6E89BE
oklch(63.1% 0.086 263.3)
-
Step 600
600
#5672AA
oklch(55.5% 0.094 263.4)
-
Step 700
700 (this color)
#3F588A
oklch(46.4% 0.087 263.2)
-
Step 800
800
#3A4E77
oklch(42.7% 0.073 263.8)
-
Step 900
900
#324160
oklch(37.7% 0.057 264.1)
-
Step 950
950
#1D2638
oklch(26.9% 0.036 263.7)
#3F588A 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) | #445C8C | 0.014 |
| Deuteranopia (no green cones) | #3B5589 | 0.011 |
| Tritanopia (no blue cones) | #19636A | 0.079 |
| Achromatopsia (no color) | #585858 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F588A
#3F588A
oklch(46.4% 0.087 263.2)
- #715412
#715412
oklch(46.5% 0.088 82.9)
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 #3F588A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.014
- Light Navy Blue #2E5A88 ΔE 0.019
- Dusk #4E5481 ΔE 0.024
- Dusky Blue #475F94 ΔE 0.027
- Twilight #4E518B ΔE 0.027
- Denim #3B638C ΔE 0.032
- Dusk Blue #26538D ΔE 0.033
- YInMn Blue #415A77 ΔE 0.034
Use #3F588A 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.