#3F548A
Closest named color: Denim Blue (#3B5B92). oklch(45.5% 0.092 266.7), rgb(63, 84, 138).
Aa
White text reads best on this color (7.37:1).
About this color
#3F548A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.092 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.022 away. White text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #3F548A |
| RGB | rgb(63, 84, 138) |
| HSL | hsl(223, 37%, 39%) |
| OKLCH | oklch(45.5% 0.092 266.7) |
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 #3F548A | 7.37:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #3F548A | 2.84:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #3F548A text on white | 7.37:1 | AAA | Lc 85.5 | Fine for body text |
| #3F548A text on black | 2.84:1 | Fails | Lc -16.5 | 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 800.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E4
oklch(80.8% 0.054 267.4)
-
Step 400
400
#889FD7
oklch(70.6% 0.086 267)
-
Step 500
500
#6B87CC
oklch(63.1% 0.109 266.5)
-
Step 600
600
#536FB9
oklch(55.5% 0.12 266.9)
-
Step 700
700
#445DA0
oklch(49.2% 0.112 266.9)
-
Step 800
800 (this color)
#3F548A
oklch(45.5% 0.092 266.7)
-
Step 900
900
#304068
oklch(37.8% 0.072 266.5)
-
Step 950
950
#1C263D
oklch(27.1% 0.045 265.6)
#3F548A 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) | #3E598C | 0.014 |
| Deuteranopia (no green cones) | #365389 | 0.012 |
| Tritanopia (no blue cones) | #1A6068 | 0.084 |
| Achromatopsia (no color) | #565656 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F548A
#3F548A
oklch(45.5% 0.092 266.7)
- #6D5202
#6D5202
oklch(45.4% 0.092 86.3)
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 #3F548A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.022
- Twilight #4E518B ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.025
- Dusk #4E5481 ΔE 0.025
- Dusk Blue #26538D ΔE 0.028
- Dusky Blue #475F94 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.040
- Denim #3B638C ΔE 0.044
Use #3F548A 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.