#3F4E5F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.8% 0.034 251.8), rgb(63, 78, 95).
Aa
White text reads best on this color (8.51:1).
About this color
#3F4E5F is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.034 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.037 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #3F4E5F |
| RGB | rgb(63, 78, 95) |
| HSL | hsl(212, 20%, 31%) |
| OKLCH | oklch(41.8% 0.034 251.8) |
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 #3F4E5F | 8.51:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #3F4E5F | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #3F4E5F text on white | 8.51:1 | AAA | Lc 89.3 | Fine for body text |
| #3F4E5F text on black | 2.46:1 | Fails | Lc -12.9 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B8C2CE
oklch(81% 0.02 252.9)
-
Step 400
400
#93A2B5
oklch(70.7% 0.033 254.4)
-
Step 500
500
#788CA2
oklch(63.2% 0.04 250.9)
-
Step 600
600
#61758D
oklch(55.5% 0.044 253.2)
-
Step 700
700
#506378
oklch(49.2% 0.041 251.2)
-
Step 800
800 (this color)
#3F4E5F
oklch(41.8% 0.034 251.8)
-
Step 900
900
#374350
oklch(37.8% 0.027 250.6)
-
Step 950
950
#21272F
oklch(27% 0.017 255.7)
#3F4E5F 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) | #484E60 | 0.014 |
| Deuteranopia (no green cones) | #444B5F | 0.011 |
| Tritanopia (no blue cones) | #355254 | 0.029 |
| Achromatopsia (no color) | #4D4D4D | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E5F
#3F4E5F
oklch(41.8% 0.034 251.8)
- #584A38
#584A38
oklch(41.8% 0.034 73.6)
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 #3F4E5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal #264653 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.047
- Dusty Grape #545775 ΔE 0.054
- Deep Teal #00555A ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.055
- Dusk #4E5481 ΔE 0.062
Use #3F4E5F 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.