#3F4F65
Closest named color: YInMn Blue (#415A77). oklch(42.3% 0.042 256.4), rgb(63, 79, 101).
Aa
White text reads best on this color (8.34:1).
About this color
#3F4F65 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.042 and its hue 256°. 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 8.34:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.51:1 |
| White text | 8.34:1 |
Values
| HEX | #3F4F65 |
| RGB | rgb(63, 79, 101) |
| HSL | hsl(215, 23%, 32%) |
| OKLCH | oklch(42.3% 0.042 256.4) |
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 #3F4F65 | 8.34:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #3F4F65 | 2.51:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #3F4F65 text on white | 8.34:1 | AAA | Lc 88.8 | Fine for body text |
| #3F4F65 text on black | 2.51:1 | Fails | Lc -13.4 | 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
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B7C2D1
oklch(81% 0.024 256.1)
-
Step 400
400
#91A2B9
oklch(70.7% 0.039 256)
-
Step 500
500
#768BA8
oklch(63.1% 0.05 256.5)
-
Step 600
600
#5F7593
oklch(55.6% 0.054 256.3)
-
Step 700
700
#4E627E
oklch(49.1% 0.051 256.8)
-
Step 800
800 (this color)
#3F4F65
oklch(42.3% 0.042 256.4)
-
Step 900
900
#364253
oklch(37.6% 0.033 257.1)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#3F4F65 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) | #475066 | 0.012 |
| Deuteranopia (no green cones) | #434C65 | 0.010 |
| Tritanopia (no blue cones) | #335456 | 0.038 |
| Achromatopsia (no color) | #4E4E4E | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F65
#3F4F65
oklch(42.3% 0.042 256.4)
- #5B4B34
#5B4B34
oklch(42.3% 0.041 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 #3F4F65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dusty Grape #545775 ΔE 0.047
- Charcoal #264653 ΔE 0.053
- Dusk #4E5481 ΔE 0.053
- Deep Teal #00555A ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.060
Use #3F4F65 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.