#3F4E7B
Closest named color: Dusk (#4E5481). oklch(43.2% 0.077 269), rgb(63, 78, 123).
Aa
White text reads best on this color (8.11:1).
About this color
#3F4E7B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.077 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.031 away. White text reads best on it, at 8.11:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.58:1 |
| White text | 8.11:1 |
Values
| HEX | #3F4E7B |
| RGB | rgb(63, 78, 123) |
| HSL | hsl(225, 32%, 36%) |
| OKLCH | oklch(43.2% 0.077 269) |
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 #3F4E7B | 8.11:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #3F4E7B | 2.58:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F4E7B text on white | 8.11:1 | AAA | Lc 88.0 | Fine for body text |
| #3F4E7B text on black | 2.58:1 | Fails | Lc -14.1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8E9FCE
oklch(70.6% 0.072 269.1)
-
Step 500
500
#7387C2
oklch(63.2% 0.092 269.3)
-
Step 600
600
#5B70AE
oklch(55.6% 0.1 268.8)
-
Step 700
700
#4B5D96
oklch(49% 0.094 269.4)
-
Step 800
800 (this color)
#3F4E7B
oklch(43.2% 0.077 269)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1F2639
oklch(27.1% 0.037 268.4)
#3F4E7B 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) | #3D527D | 0.012 |
| Deuteranopia (no green cones) | #374D7A | 0.012 |
| Tritanopia (no blue cones) | #28575E | 0.069 |
| Achromatopsia (no color) | #505050 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E7B
#3F4E7B
oklch(43.2% 0.077 269)
- #614E15
#614E15
oklch(43.2% 0.077 89.8)
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 #3F4E7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.031
- Twilight #4E518B ΔE 0.036
- Dusk Blue #26538D ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.039
- Light Navy #155084 ΔE 0.042
- Dusty Grape #545775 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.047
Use #3F4E7B 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.