#3F516F
Closest named color: YInMn Blue (#415A77). oklch(43.3% 0.055 260.4), rgb(63, 81, 111).
Aa
White text reads best on this color (8.02:1).
About this color
#3F516F is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.055 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.028 away. White text reads best on it, at 8.02:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.61:1 |
| White text | 8.02:1 |
Values
| HEX | #3F516F |
| RGB | rgb(63, 81, 111) |
| HSL | hsl(218, 28%, 34%) |
| OKLCH | oklch(43.3% 0.055 260.4) |
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 #3F516F | 8.02:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #3F516F | 2.61:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #3F516F text on white | 8.02:1 | AAA | Lc 87.8 | Fine for body text |
| #3F516F text on black | 2.61:1 | Fails | Lc -14.4 | 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
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B5C1D6
oklch(80.8% 0.032 261.7)
-
Step 400
400
#8EA2C1
oklch(70.8% 0.051 259.1)
-
Step 500
500
#738AB2
oklch(63.1% 0.066 261.3)
-
Step 600
600
#5B749D
oklch(55.6% 0.071 260.1)
-
Step 700
700
#4B6187
oklch(49.1% 0.067 261)
-
Step 800
800 (this color)
#3F516F
oklch(43.3% 0.055 260.4)
-
Step 900
900
#344259
oklch(37.7% 0.044 260.2)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#3F516F 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) | #465370 | 0.012 |
| Deuteranopia (no green cones) | #414E6E | 0.009 |
| Tritanopia (no blue cones) | #2E575B | 0.049 |
| Achromatopsia (no color) | #505050 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F516F
#3F516F
oklch(43.3% 0.055 260.4)
- #604D2C
#604D2C
oklch(43.2% 0.055 80.3)
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 #3F516F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.028
- Dusty Grape #545775 ΔE 0.038
- Dusk #4E5481 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.045
- Light Navy #155084 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.053
- Twilight #4E518B ΔE 0.053
- Dusk Blue #26538D ΔE 0.054
Use #3F516F 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.