#403640
Closest named color: Onyx (#343A40). oklch(34.7% 0.022 326), rgb(64, 54, 64).
Aa
White text reads best on this color (11.54:1).
About this color
#403640 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.023 away. White text reads best on it, at 11.54:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #403640 |
| RGB | rgb(64, 54, 64) |
| HSL | hsl(300, 8%, 23%) |
| OKLCH | oklch(34.7% 0.022 326) |
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 #403640 | 11.54:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #403640 | 1.81:1 | Fails | Lc 0.0 | Not readable |
| #403640 text on white | 11.54:1 | AAA | Lc 96.6 | Preferred for body text |
| #403640 text on black | 1.81:1 | Fails | Lc 0.0 | 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
#F6F5F6
oklch(97.1% 0.002 325.6)
-
Step 100
100
#EBE9EB
oklch(93.6% 0.003 325.6)
-
Step 200
200
#DCD7DC
oklch(88.5% 0.009 325.6)
-
Step 300
300
#C6BDC6
oklch(80.8% 0.016 325.7)
-
Step 400
400
#AA9BA9
oklch(70.7% 0.026 327.9)
-
Step 500
500
#958395
oklch(63.2% 0.034 326)
-
Step 600
600
#7F6C7F
oklch(55.6% 0.037 326.1)
-
Step 700
700
#6B5A6B
oklch(49% 0.034 326.1)
-
Step 800
800
#574A57
oklch(42.7% 0.027 326)
-
Step 900
900 (this color)
#403640
oklch(34.7% 0.022 326)
-
Step 950
950
#2A242A
oklch(26.9% 0.014 326)
#403640 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) | #353840 | 0.020 |
| Deuteranopia (no green cones) | #383940 | 0.016 |
| Tritanopia (no blue cones) | #413739 | 0.014 |
| Achromatopsia (no color) | #393939 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403640
#403640
oklch(34.7% 0.022 326)
- #333D33
#333D33
oklch(34.7% 0.022 145.1)
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 #403640, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.035
- Gunmetal #293241 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.051
- Charcoal #264653 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.066
Use #403640 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.