#3F4B60
Closest named color: Dark Grey Blue (#29465B). oklch(41.1% 0.039 261.5), rgb(63, 75, 96).
Aa
White text reads best on this color (8.79:1).
About this color
#3F4B60 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.039 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 8.79:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #3F4B60 |
| RGB | rgb(63, 75, 96) |
| HSL | hsl(218, 21%, 31%) |
| OKLCH | oklch(41.1% 0.039 261.5) |
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 #3F4B60 | 8.79:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #3F4B60 | 2.38:1 | Fails | Lc 13.9 | Not readable |
| #3F4B60 text on white | 8.79:1 | AAA | Lc 90.1 | Preferred for body text |
| #3F4B60 text on black | 2.38:1 | Fails | Lc -12.2 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B9C1D0
oklch(80.9% 0.023 263.2)
-
Step 400
400
#94A1B8
oklch(70.6% 0.037 261.9)
-
Step 500
500
#7A8AA6
oklch(63.1% 0.046 261.6)
-
Step 600
600
#637491
oklch(55.6% 0.05 261)
-
Step 700
700
#52617C
oklch(49.1% 0.047 262)
-
Step 800
800 (this color)
#3F4B60
oklch(41.1% 0.039 261.5)
-
Step 900
900
#394252
oklch(37.8% 0.03 261.9)
-
Step 950
950
#212730
oklch(27.1% 0.019 258.4)
#3F4B60 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) | #444C61 | 0.009 |
| Deuteranopia (no green cones) | #414960 | 0.007 |
| Tritanopia (no blue cones) | #354F52 | 0.034 |
| Achromatopsia (no color) | #4A4A4A | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4B60
#3F4B60
oklch(41.1% 0.039 261.5)
- #554932
#554932
oklch(41.1% 0.039 83.3)
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 #3F4B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.042
- Charcoal #264653 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.053
- Dusty Grape #545775 ΔE 0.058
- Deep Teal #00555A ΔE 0.060
- Dusk #4E5481 ΔE 0.062
Use #3F4B60 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.