#3F4D6C
Closest named color: YInMn Blue (#415A77). oklch(42.2% 0.055 265.4), rgb(63, 77, 108).
Aa
White text reads best on this color (8.43:1).
About this color
#3F4D6C is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.055 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.040 away. White text reads best on it, at 8.43:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.48:1 |
| White text | 8.43:1 |
Values
| HEX | #3F4D6C |
| RGB | rgb(63, 77, 108) |
| HSL | hsl(221, 26%, 34%) |
| OKLCH | oklch(42.2% 0.055 265.4) |
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 #3F4D6C | 8.43:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #3F4D6C | 2.48:1 | Fails | Lc 15.0 | Not readable |
| #3F4D6C text on white | 8.43:1 | AAA | Lc 89.0 | Fine for body text |
| #3F4D6C text on black | 2.48:1 | Fails | Lc -13.2 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B7C1D6
oklch(81% 0.032 265.3)
-
Step 400
400
#91A1C2
oklch(70.8% 0.052 264.7)
-
Step 500
500
#7689B2
oklch(63.1% 0.066 265.2)
-
Step 600
600
#5F739E
oklch(55.7% 0.071 264.9)
-
Step 700
700
#4E6087
oklch(49.1% 0.067 265)
-
Step 800
800 (this color)
#3F4D6C
oklch(42.2% 0.055 265.4)
-
Step 900
900
#374159
oklch(37.7% 0.043 266.8)
-
Step 950
950
#202634
oklch(26.9% 0.028 266.5)
#3F4D6C 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) | #424F6D | 0.008 |
| Deuteranopia (no green cones) | #3E4B6B | 0.006 |
| Tritanopia (no blue cones) | #305358 | 0.048 |
| Achromatopsia (no color) | #4D4D4D | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4D6C
#3F4D6C
oklch(42.2% 0.055 265.4)
- #5B4B29
#5B4B29
oklch(42.1% 0.054 84.9)
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 #3F4D6C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.040
- Dusk #4E5481 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.047
- Dusty Grape #545775 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.054
- Light Navy #155084 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.056
- Twilight #4E518B ΔE 0.057
Use #3F4D6C 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.