#3F4E64
Closest named color: Dark Grey Blue (#29465B). oklch(42% 0.042 257.9), rgb(63, 78, 100).
Aa
White text reads best on this color (8.45:1).
About this color
#3F4E64 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.042 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.042 away. White text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #3F4E64 |
| RGB | rgb(63, 78, 100) |
| HSL | hsl(216, 23%, 32%) |
| OKLCH | oklch(42% 0.042 257.9) |
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 #3F4E64 | 8.45:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #3F4E64 | 2.48:1 | Fails | Lc 14.9 | Not readable |
| #3F4E64 text on white | 8.45:1 | AAA | Lc 89.1 | Fine for body text |
| #3F4E64 text on black | 2.48:1 | Fails | Lc -13.1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4DAE2
oklch(88.6% 0.013 255.5)
-
Step 300
300
#B7C1D1
oklch(80.8% 0.025 259.8)
-
Step 400
400
#92A2B9
oklch(70.7% 0.038 257.4)
-
Step 500
500
#778BA8
oklch(63.1% 0.05 257.6)
-
Step 600
600
#607593
oklch(55.7% 0.053 257.3)
-
Step 700
700
#4F627D
oklch(49.1% 0.049 257.2)
-
Step 800
800 (this color)
#3F4E64
oklch(42% 0.042 257.9)
-
Step 900
900
#374253
oklch(37.6% 0.033 259)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#3F4E64 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) | #464F65 | 0.011 |
| Deuteranopia (no green cones) | #424B64 | 0.010 |
| Tritanopia (no blue cones) | #345355 | 0.038 |
| Achromatopsia (no color) | #4D4D4D | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E64
#3F4E64
oklch(42% 0.042 257.9)
- #5A4A33
#5A4A33
oklch(41.9% 0.042 76.3)
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 #3F4E64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.042
- YInMn Blue #415A77 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dusty Grape #545775 ΔE 0.050
- Charcoal #264653 ΔE 0.051
- Dusk #4E5481 ΔE 0.055
- Deep Teal #00555A ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.062
Use #3F4E64 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.