#3F5AA1
Closest named color: Denim Blue (#3B5B92). oklch(48.3% 0.119 266.4), rgb(63, 90, 161).
Aa
White text reads best on this color (6.58:1).
About this color
#3F5AA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.119 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.026 away. White text reads best on it, at 6.58:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.18:1 |
| White text | 6.58:1 |
Values
| HEX | #3F5AA1 |
| RGB | rgb(63, 90, 161) |
| HSL | hsl(223, 44%, 44%) |
| OKLCH | oklch(48.3% 0.119 266.4) |
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 #3F5AA1 | 6.58:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #3F5AA1 | 3.18:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #3F5AA1 text on white | 6.58:1 | AA | Lc 82.4 | Fine for body text |
| #3F5AA1 text on black | 3.18:1 | AA large text | Lc -19.5 | 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 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#AFC0E7
oklch(80.8% 0.058 266.6)
-
Step 400
400
#869FDB
oklch(70.7% 0.093 266.7)
-
Step 500
500
#6886D1
oklch(63% 0.119 266.5)
-
Step 600
600
#506FBE
oklch(55.6% 0.128 266.2)
-
Step 700
700 (this color)
#3F5AA1
oklch(48.3% 0.119 266.4)
-
Step 800
800
#364C85
oklch(42.8% 0.099 266.4)
-
Step 900
900
#2F406A
oklch(37.8% 0.075 266.2)
-
Step 950
950
#1B253E
oklch(26.8% 0.049 266.6)
#3F5AA1 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) | #3A62A4 | 0.022 |
| Deuteranopia (no green cones) | #2C599F | 0.021 |
| Tritanopia (no blue cones) | #006A75 | 0.104 |
| Achromatopsia (no color) | #5D5D5D | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5AA1
#3F5AA1
oklch(48.3% 0.119 266.4)
- #775900
#775900
oklch(48.2% 0.099 85.7)
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 #3F5AA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.026
- Dusky Blue #475F94 ΔE 0.030
- Twilight #4E518B ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.046
- Denim #3B638C ΔE 0.047
- Dusk Blue #26538D ΔE 0.047
- Mid Blue #276AB3 ΔE 0.049
- French Blue #436BAD ΔE 0.049
Use #3F5AA1 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.