#3F548B
Closest named color: Denim Blue (#3B5B92). oklch(45.5% 0.094 266.9), rgb(63, 84, 139).
Aa
White text reads best on this color (7.36:1).
About this color
#3F548B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.094 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.021 away. White text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #3F548B |
| RGB | rgb(63, 84, 139) |
| HSL | hsl(223, 38%, 40%) |
| OKLCH | oklch(45.5% 0.094 266.9) |
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 #3F548B | 7.36:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #3F548B | 2.85:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #3F548B text on white | 7.36:1 | AAA | Lc 85.5 | Fine for body text |
| #3F548B text on black | 2.85:1 | Fails | Lc -16.6 | 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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
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
#B1C0E5
oklch(80.9% 0.055 267.8)
-
Step 400
400
#889FD8
oklch(70.7% 0.088 267.2)
-
Step 500
500
#6B87CE
oklch(63.2% 0.112 266.9)
-
Step 600
600
#536FBA
oklch(55.5% 0.121 267)
-
Step 700
700
#435DA1
oklch(49.2% 0.113 266.5)
-
Step 800
800 (this color)
#3F548B
oklch(45.5% 0.094 266.9)
-
Step 900
900
#304068
oklch(37.8% 0.072 266.5)
-
Step 950
950
#1C253D
oklch(26.9% 0.047 267.6)
#3F548B 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) | #3E598D | 0.014 |
| Deuteranopia (no green cones) | #35538A | 0.013 |
| Tritanopia (no blue cones) | #196069 | 0.084 |
| Achromatopsia (no color) | #565656 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F548B
#3F548B
oklch(45.5% 0.094 266.9)
- #6D5200
#6D5200
oklch(45.4% 0.093 86.5)
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 #3F548B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.021
- Twilight #4E518B ΔE 0.021
- Light Navy Blue #2E5A88 ΔE 0.025
- Dusk #4E5481 ΔE 0.026
- Dusk Blue #26538D ΔE 0.028
- Dusky Blue #475F94 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.042
- Denim #3B638C ΔE 0.044
Use #3F548B 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.