#3F4D63
Closest named color: Dark Grey Blue (#29465B). oklch(41.7% 0.041 259.3), rgb(63, 77, 99).
Aa
White text reads best on this color (8.56:1).
About this color
#3F4D63 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.041 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.040 away. White text reads best on it, at 8.56:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.45:1 |
| White text | 8.56:1 |
Values
| HEX | #3F4D63 |
| RGB | rgb(63, 77, 99) |
| HSL | hsl(217, 22%, 32%) |
| OKLCH | oklch(41.7% 0.041 259.3) |
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 #3F4D63 | 8.56:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #3F4D63 | 2.45:1 | Fails | Lc 14.6 | Not readable |
| #3F4D63 text on white | 8.56:1 | AAA | Lc 89.4 | Fine for body text |
| #3F4D63 text on black | 2.45:1 | Fails | Lc -12.8 | 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
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D1
oklch(80.9% 0.025 262.1)
-
Step 400
400
#93A2B9
oklch(70.8% 0.038 258.9)
-
Step 500
500
#788BA8
oklch(63.2% 0.049 258.7)
-
Step 600
600
#617493
oklch(55.6% 0.054 260.1)
-
Step 700
700
#50627D
oklch(49.2% 0.049 258.3)
-
Step 800
800 (this color)
#3F4D63
oklch(41.7% 0.041 259.3)
-
Step 900
900
#374253
oklch(37.6% 0.033 259)
-
Step 950
950
#212731
oklch(27.1% 0.021 260.6)
#3F4D63 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) | #454E64 | 0.010 |
| Deuteranopia (no green cones) | #424B63 | 0.007 |
| Tritanopia (no blue cones) | #345254 | 0.038 |
| Achromatopsia (no color) | #4C4C4C | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4D63
#3F4D63
oklch(41.7% 0.041 259.3)
- #584A32
#584A32
oklch(41.7% 0.041 80.6)
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 #3F4D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.044
- YInMn Blue #415A77 ΔE 0.046
- Charcoal #264653 ΔE 0.049
- Dusty Grape #545775 ΔE 0.052
- Dusk #4E5481 ΔE 0.057
- Charcoal Grey #3C4142 ΔE 0.059
- Deep Teal #00555A ΔE 0.059
Use #3F4D63 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.