#3D505F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.1% 0.035 242.4), rgb(61, 80, 95).
Aa
White text reads best on this color (8.36:1).
About this color
#3D505F is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.035 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.034 away. White text reads best on it, at 8.36:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.51:1 |
| White text | 8.36:1 |
Values
| HEX | #3D505F |
| RGB | rgb(61, 80, 95) |
| HSL | hsl(206, 22%, 31%) |
| OKLCH | oklch(42.1% 0.035 242.4) |
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 #3D505F | 8.36:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #3D505F | 2.51:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #3D505F text on white | 8.36:1 | AAA | Lc 88.8 | Fine for body text |
| #3D505F 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B6C2CD
oklch(80.8% 0.02 245.7)
-
Step 400
400
#90A3B3
oklch(70.6% 0.032 243.6)
-
Step 500
500
#748DA1
oklch(63.1% 0.042 242.5)
-
Step 600
600
#5C778C
oklch(55.6% 0.045 242)
-
Step 700
700
#4C6477
oklch(49.1% 0.042 242.5)
-
Step 800
800 (this color)
#3D505F
oklch(42.1% 0.035 242.4)
-
Step 900
900
#35444F
oklch(37.8% 0.027 240.2)
-
Step 950
950
#1F282E
oklch(27.1% 0.017 237.4)
#3D505F 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) | #4A5060 | 0.019 |
| Deuteranopia (no green cones) | #454C5F | 0.016 |
| Tritanopia (no blue cones) | #325455 | 0.028 |
| Achromatopsia (no color) | #4E4E4E | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D505F
#3D505F
oklch(42.1% 0.035 242.4)
- #5B493A
#5B493A
oklch(42% 0.034 61.5)
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 #3D505F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.043
- YInMn Blue #415A77 ΔE 0.045
- Charcoal #264653 ΔE 0.048
- Deep Teal #00555A ΔE 0.050
- Dusty Grape #545775 ΔE 0.054
- Petrol #005F6A ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.058
Use #3D505F 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.