#3F52A7
Closest named color: Denim Blue (#3B5B92). oklch(47% 0.138 270.8), rgb(63, 82, 167).
Aa
White text reads best on this color (7.05:1).
About this color
#3F52A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.138 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.046 away. White text reads best on it, at 7.05:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.97:1 |
| White text | 7.05:1 |
Values
| HEX | #3F52A7 |
| RGB | rgb(63, 82, 167) |
| HSL | hsl(229, 45%, 45%) |
| OKLCH | oklch(47% 0.138 270.8) |
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 #3F52A7 | 7.05:1 | AAA | Lc -89.1 | Fine for body text |
| Black text on #3F52A7 | 2.97:1 | Fails | Lc 19.9 | Dividers and decoration only |
| #3F52A7 text on white | 7.05:1 | AAA | Lc 84.2 | Fine for body text |
| #3F52A7 text on black | 2.97:1 | Fails | Lc -17.8 | 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
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#889DE4
oklch(70.8% 0.107 270.9)
-
Step 500
500
#6B83DC
oklch(63.2% 0.137 270.7)
-
Step 600
600
#546BC9
oklch(55.7% 0.147 270.6)
-
Step 700
700 (this color)
#3F52A7
oklch(47% 0.138 270.8)
-
Step 800
800
#38498D
oklch(42.8% 0.114 270.4)
-
Step 900
900
#303D70
oklch(37.6% 0.089 270.9)
-
Step 950
950
#1C2442
oklch(26.9% 0.057 270.9)
#3F52A7 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) | #235DAA | 0.036 |
| Deuteranopia (no green cones) | #0954A5 | 0.042 |
| Tritanopia (no blue cones) | #006674 | 0.120 |
| Achromatopsia (no color) | #595959 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F52A7
#3F52A7
oklch(47% 0.138 270.8)
- #6F5800
#6F5800
oklch(47% 0.096 91.1)
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 #3F52A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.046
- Twilight #4E518B ΔE 0.049
- Blueberry #464196 ΔE 0.049
- Dusk Blue #26538D ΔE 0.052
- Dusky Blue #475F94 ΔE 0.053
- Cobalt #1E488F ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.062
- Mid Blue #276AB3 ΔE 0.065
Use #3F52A7 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.