#3F4E71
Closest named color: YInMn Blue (#415A77). oklch(42.7% 0.062 266.1), rgb(63, 78, 113).
Aa
White text reads best on this color (8.26:1).
About this color
#3F4E71 is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.062 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.036 away. White text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.53:1 |
| White text | 8.26:1 |
Values
| HEX | #3F4E71 |
| RGB | rgb(63, 78, 113) |
| HSL | hsl(222, 28%, 35%) |
| OKLCH | oklch(42.7% 0.062 266.1) |
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 #3F4E71 | 8.26:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #3F4E71 | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #3F4E71 text on white | 8.26:1 | AAA | Lc 88.5 | Fine for body text |
| #3F4E71 text on black | 2.53:1 | Fails | Lc -13.7 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D3D9E7
oklch(88.5% 0.02 267.3)
-
Step 300
300
#B6C1D9
oklch(81% 0.036 265.9)
-
Step 400
400
#90A0C5
oklch(70.6% 0.057 266.6)
-
Step 500
500
#7589B7
oklch(63.2% 0.073 266.2)
-
Step 600
600
#5D72A3
oklch(55.6% 0.081 266.1)
-
Step 700
700
#4D5F8B
oklch(49% 0.074 266.7)
-
Step 800
800 (this color)
#3F4E71
oklch(42.7% 0.062 266.1)
-
Step 900
900
#36415B
oklch(37.7% 0.047 266.5)
-
Step 950
950
#1F2636
oklch(26.9% 0.032 266.1)
#3F4E71 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) | #425173 | 0.011 |
| Deuteranopia (no green cones) | #3D4C70 | 0.007 |
| Tritanopia (no blue cones) | #2E555A | 0.055 |
| Achromatopsia (no color) | #4E4E4E | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E71
#3F4E71
oklch(42.7% 0.062 266.1)
- #5E4C24
#5E4C24
oklch(42.6% 0.062 85.4)
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 #3F4E71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.036
- Dusk #4E5481 ΔE 0.038
- Dusty Grape #545775 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.047
- Light Navy #155084 ΔE 0.049
- Twilight #4E518B ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
Use #3F4E71 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.