#3F52AB
Closest named color: Denim Blue (#3B5B92). oklch(47.3% 0.144 270.9), rgb(63, 82, 171).
Aa
White text reads best on this color (6.98:1).
About this color
#3F52AB is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.144 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.051 away. White text reads best on it, at 6.98:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.00:1 |
| White text | 6.98:1 |
Values
| HEX | #3F52AB |
| RGB | rgb(63, 82, 171) |
| HSL | hsl(229, 46%, 46%) |
| OKLCH | oklch(47.3% 0.144 270.9) |
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 #3F52AB | 6.98:1 | AA | Lc -88.9 | Fine for body text |
| Black text on #3F52AB | 3.00:1 | AA large text | Lc 20.1 | Dividers and decoration only |
| #3F52AB text on white | 6.98:1 | AA | Lc 83.9 | Fine for body text |
| #3F52AB text on black | 3.00:1 | AA large text | Lc -18.1 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#CFD8F3
oklch(88.4% 0.038 271)
-
Step 300
300
#B0BFEE
oklch(80.9% 0.069 271)
-
Step 400
400
#879CE6
oklch(70.6% 0.111 271.2)
-
Step 500
500
#6A82DF
oklch(63.1% 0.142 270.9)
-
Step 600
600
#536ACD
oklch(55.7% 0.155 270.8)
-
Step 700
700 (this color)
#3F52AB
oklch(47.3% 0.144 270.9)
-
Step 800
800
#38488F
oklch(42.7% 0.118 271.1)
-
Step 900
900
#303D72
oklch(37.7% 0.092 271.1)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#3F52AB 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) | #1E5EAE | 0.039 |
| Deuteranopia (no green cones) | #0055A9 | 0.044 |
| Tritanopia (no blue cones) | #006776 | 0.123 |
| Achromatopsia (no color) | #595959 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F52AB
#3F52AB
oklch(47.3% 0.144 270.9)
- #705900
#705900
oklch(47.4% 0.097 91.3)
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 #3F52AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.051
- Blueberry #464196 ΔE 0.052
- Twilight #4E518B ΔE 0.055
- Dusk Blue #26538D ΔE 0.058
- Dusky Blue #475F94 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.064
- Cobalt #1E488F ΔE 0.066
- Iris #6258C4 ΔE 0.067
Use #3F52AB 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.