#404D5F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.6% 0.035 256.6), rgb(64, 77, 95).
Aa
White text reads best on this color (8.58:1).
About this color
#404D5F is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.035 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.039 away. White text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #404D5F |
| RGB | rgb(64, 77, 95) |
| HSL | hsl(215, 19%, 31%) |
| OKLCH | oklch(41.6% 0.035 256.6) |
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 #404D5F | 8.58:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #404D5F | 2.44:1 | Fails | Lc 14.5 | Not readable |
| #404D5F text on white | 8.58:1 | AAA | Lc 89.5 | Fine for body text |
| #404D5F text on black | 2.44:1 | Fails | Lc -12.7 | 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
#D4DAE1
oklch(88.6% 0.012 252.1)
-
Step 300
300
#B8C1CE
oklch(80.8% 0.021 257.5)
-
Step 400
400
#94A2B5
oklch(70.7% 0.032 256)
-
Step 500
500
#7A8BA3
oklch(63.2% 0.041 257)
-
Step 600
600
#63758E
oklch(55.7% 0.045 256.6)
-
Step 700
700
#526279
oklch(49.2% 0.042 257.4)
-
Step 800
800 (this color)
#404D5F
oklch(41.6% 0.035 256.6)
-
Step 900
900
#384250
oklch(37.6% 0.027 256.8)
-
Step 950
950
#21272F
oklch(27% 0.017 255.7)
#404D5F 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) | #474E60 | 0.011 |
| Deuteranopia (no green cones) | #434B5F | 0.007 |
| Tritanopia (no blue cones) | #375153 | 0.030 |
| Achromatopsia (no color) | #4C4C4C | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404D5F
#404D5F
oklch(41.6% 0.035 256.6)
- #574A37
#574A37
oklch(41.7% 0.035 77)
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 #404D5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.054
- Dusty Grape #545775 ΔE 0.055
- Deep Teal #00555A ΔE 0.058
- Dusk #4E5481 ΔE 0.062
Use #404D5F 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.