#3F52A5
Closest named color: Denim Blue (#3B5B92). oklch(46.8% 0.135 270.7), rgb(63, 82, 165).
Aa
White text reads best on this color (7.09:1).
About this color
#3F52A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.135 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.043 away. White text reads best on it, at 7.09:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.96:1 |
| White text | 7.09:1 |
Values
| HEX | #3F52A5 |
| RGB | rgb(63, 82, 165) |
| HSL | hsl(229, 45%, 45%) |
| OKLCH | oklch(46.8% 0.135 270.7) |
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 #3F52A5 | 7.09:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #3F52A5 | 2.96:1 | Fails | Lc 19.7 | Dividers and decoration only |
| #3F52A5 text on white | 7.09:1 | AAA | Lc 84.3 | Fine for body text |
| #3F52A5 text on black | 2.96:1 | Fails | Lc -17.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B0BFEC
oklch(80.9% 0.066 270.5)
-
Step 400
400
#889DE2
oklch(70.7% 0.104 270.6)
-
Step 500
500
#6B83DA
oklch(63.1% 0.134 270.5)
-
Step 600
600
#546BC7
oklch(55.6% 0.145 270.5)
-
Step 700
700 (this color)
#3F52A5
oklch(46.8% 0.135 270.7)
-
Step 800
800
#39498C
oklch(42.8% 0.112 270.9)
-
Step 900
900
#303E70
oklch(37.8% 0.087 270)
-
Step 950
950
#1C2441
oklch(26.9% 0.055 270.7)
#3F52A5 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) | #265DA8 | 0.035 |
| Deuteranopia (no green cones) | #1054A3 | 0.040 |
| Tritanopia (no blue cones) | #006573 | 0.117 |
| Achromatopsia (no color) | #585858 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F52A5
#3F52A5
oklch(46.8% 0.135 270.7)
- #6F5700
#6F5700
oklch(46.8% 0.096 90.1)
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 #3F52A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.043
- Twilight #4E518B ΔE 0.046
- Blueberry #464196 ΔE 0.048
- Dusk Blue #26538D ΔE 0.049
- Dusky Blue #475F94 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Dusk #4E5481 ΔE 0.063
Use #3F52A5 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.