#404757
Closest named color: Dark Grey Blue (#29465B). oklch(39.8% 0.029 266.5), rgb(64, 71, 87).
Aa
White text reads best on this color (9.30:1).
About this color
#404757 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 9.30:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #404757 |
| RGB | rgb(64, 71, 87) |
| HSL | hsl(222, 15%, 30%) |
| OKLCH | oklch(39.8% 0.029 266.5) |
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 #404757 | 9.30:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #404757 | 2.25:1 | Fails | Lc 12.5 | Not readable |
| #404757 text on white | 9.30:1 | AAA | Lc 91.5 | Preferred for body text |
| #404757 text on black | 2.25:1 | Fails | Lc -10.9 | 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 900.
-
Step 50
50
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E1
oklch(88.5% 0.012 264.5)
-
Step 300
300
#BAC1CF
oklch(81% 0.021 264.4)
-
Step 400
400
#97A1B7
oklch(70.8% 0.034 266.1)
-
Step 500
500
#7D89A5
oklch(63% 0.045 266.9)
-
Step 600
600
#667390
oklch(55.6% 0.048 266)
-
Step 700
700
#55607A
oklch(49% 0.044 266.9)
-
Step 800
800
#464F64
oklch(42.8% 0.037 266.7)
-
Step 900
900 (this color)
#404757
oklch(39.8% 0.029 266.5)
-
Step 950
950
#222630
oklch(26.9% 0.02 267.9)
#404757 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) | #424858 | 0.005 |
| Deuteranopia (no green cones) | #404657 | 0.003 |
| Tritanopia (no blue cones) | #3A4A4C | 0.026 |
| Achromatopsia (no color) | #474747 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404757
#404757
oklch(39.8% 0.029 266.5)
- #4E4636
#4E4636
oklch(39.7% 0.028 84.5)
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 #404757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.039
- Onyx #343A40 ΔE 0.055
- Dark Teal #014D4E ΔE 0.063
- Deep Teal #00555A ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.064
Use #404757 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.