#3F4D8A
Closest named color: Twilight (#4E518B). oklch(43.9% 0.102 271.9), rgb(63, 77, 138).
Aa
White text reads best on this color (7.95:1).
About this color
#3F4D8A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.102 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.026 away. White text reads best on it, at 7.95:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.63:1 |
| White text | 7.95:1 |
Values
| HEX | #3F4D8A |
| RGB | rgb(63, 77, 138) |
| HSL | hsl(229, 37%, 39%) |
| OKLCH | oklch(43.9% 0.102 271.9) |
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 #3F4D8A | 7.95:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #3F4D8A | 2.63:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #3F4D8A text on white | 7.95:1 | AAA | Lc 87.4 | Fine for body text |
| #3F4D8A text on black | 2.63:1 | Fails | Lc -14.7 | Not readable |
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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B3BFE8
oklch(80.9% 0.06 272.2)
-
Step 400
400
#8C9DDC
oklch(70.7% 0.095 272.2)
-
Step 500
500
#7084D3
oklch(63.2% 0.121 271.8)
-
Step 600
600
#596CC0
oklch(55.7% 0.132 271.9)
-
Step 700
700
#495AA6
oklch(49.2% 0.123 271.7)
-
Step 800
800 (this color)
#3F4D8A
oklch(43.9% 0.102 271.9)
-
Step 900
900
#333E6B
oklch(37.7% 0.078 271.8)
-
Step 950
950
#1E253F
oklch(27.1% 0.049 271.4)
#3F4D8A 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) | #33548C | 0.023 |
| Deuteranopia (no green cones) | #2B4E89 | 0.024 |
| Tritanopia (no blue cones) | #1B5A64 | 0.091 |
| Achromatopsia (no color) | #515151 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4D8A
#3F4D8A
oklch(43.9% 0.102 271.9)
- #645000
#645000
oklch(43.9% 0.09 92.1)
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 #3F4D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.026
- Dusk Blue #26538D ΔE 0.030
- Dusk #4E5481 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.040
- Blueberry #464196 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.041
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.043
Use #3F4D8A 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.