#3F5DA1
Closest named color: Dusky Blue (#475F94). oklch(48.9% 0.115 264.6), rgb(63, 93, 161).
Aa
White text reads best on this color (6.37:1).
About this color
#3F5DA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.115 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.025 away. White text reads best on it, at 6.37:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #3F5DA1 |
| RGB | rgb(63, 93, 161) |
| HSL | hsl(222, 44%, 44%) |
| OKLCH | oklch(48.9% 0.115 264.6) |
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 #3F5DA1 | 6.37:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #3F5DA1 | 3.29:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #3F5DA1 text on white | 6.37:1 | AA | Lc 81.5 | Fine for body text |
| #3F5DA1 text on black | 3.29:1 | AA large text | Lc -20.4 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#AFC1E5
oklch(80.9% 0.055 264.2)
-
Step 400
400
#85A0D9
oklch(70.7% 0.089 264.7)
-
Step 500
500
#6787CE
oklch(63% 0.114 264.9)
-
Step 600
600
#4F70BB
oklch(55.6% 0.123 264.8)
-
Step 700
700 (this color)
#3F5DA1
oklch(48.9% 0.115 264.6)
-
Step 800
800
#344D83
oklch(42.8% 0.095 264.1)
-
Step 900
900
#2E4069
oklch(37.7% 0.074 265.1)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#3F5DA1 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) | #3F64A4 | 0.020 |
| Deuteranopia (no green cones) | #315BA0 | 0.017 |
| Tritanopia (no blue cones) | #006C77 | 0.099 |
| Achromatopsia (no color) | #5F5F5F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5DA1
#3F5DA1
oklch(48.9% 0.115 264.6)
- #7A5A00
#7A5A00
oklch(48.8% 0.1 84.4)
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 #3F5DA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.025
- Denim Blue #3B5B92 ΔE 0.025
- French Blue #436BAD ΔE 0.042
- Denim #3B638C ΔE 0.042
- Mid Blue #276AB3 ΔE 0.043
- Twilight #4E518B ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.046
- Dusk Blue #26538D ΔE 0.051
Use #3F5DA1 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.