#3F4D80
Closest named color: Twilight (#4E518B). oklch(43.3% 0.086 270.8), rgb(63, 77, 128).
Aa
White text reads best on this color (8.12:1).
About this color
#3F4D80 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.086 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.031 away. White text reads best on it, at 8.12:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.58:1 |
| White text | 8.12:1 |
Values
| HEX | #3F4D80 |
| RGB | rgb(63, 77, 128) |
| HSL | hsl(227, 34%, 37%) |
| OKLCH | oklch(43.3% 0.086 270.8) |
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 #3F4D80 | 8.12:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #3F4D80 | 2.58:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F4D80 text on white | 8.12:1 | AAA | Lc 88.0 | Fine for body text |
| #3F4D80 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B4C0E2
oklch(81% 0.05 269.9)
-
Step 400
400
#8E9ED4
oklch(70.7% 0.081 271.5)
-
Step 500
500
#7286C8
oklch(63.2% 0.102 270.4)
-
Step 600
600
#5B6EB5
oklch(55.5% 0.113 271)
-
Step 700
700
#4B5C9C
oklch(49.1% 0.105 270.9)
-
Step 800
800 (this color)
#3F4D80
oklch(43.3% 0.086 270.8)
-
Step 900
900
#343F65
oklch(37.6% 0.067 270.7)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#3F4D80 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) | #395382 | 0.018 |
| Deuteranopia (no green cones) | #334D7F | 0.016 |
| Tritanopia (no blue cones) | #255860 | 0.078 |
| Achromatopsia (no color) | #505050 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4D80
#3F4D80
oklch(43.3% 0.086 270.8)
- #624E05
#624E05
oklch(43.2% 0.086 91.2)
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 #3F4D80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.031
- Dusk #4E5481 ΔE 0.032
- Dusk Blue #26538D ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.039
- Light Navy #155084 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.046
- Cobalt #1E488F ΔE 0.049
Use #3F4D80 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.